Operation. BMW 840Ci, 850CI, 850CSI
The BMW 850CSI is a high-performance sports car that is designed to provide an exhilarating driving experience. It features a powerful engine, advanced technology, and a luxurious interior. The Owner's Handbook provides comprehensive information on operating, caring for, and maintaining your 850CSI. Get acquainted with features like the automatic transmission with STEPTRONIC, cruise control, EDC, ASC+T, and DSC. This handbook also covers the car's exterior and interior, detailing the operation of various controls and equipment. Use the guide to understand fuel grades, tire pressures, and other critical aspects of maintaining your vehicle.
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Vehicle identification number 91
Engine compartment
Engine compartment
Washer fluid for the cleaning
Starting with a flat battery 110
Right/left rule of the road 126
Licensing car for use abroad 127
Active Rear Axle Kinematics
Interchanging wheels and tyres 132
Important facts in brief
87
Controls
Operating hints
Care and maintenance
Technical data
Index
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Driving hints
a
Do not rest your foot on the brake pedal while the car is in motion.
Even slight continuous pressure on the brake pedal could cause overheating, brake pad wear or even brake system failure.
Aquaplaning:
Reduce speed when driving on wet or slushy roads, since a wedge of water could otherwise build up between the tyres and road. This situation, known as aquaplaning, means that the tyre can actually lose contact completely with the road surface, so that the car can neither be steered nor braked properly. You should therefore always reduce speed on a wet road.
Rear-window shelf:
Never place hard or heavy objects on the rear window shelf; they could be dislodged when the car is braked heavily and endanger the occupants.
Coat hooks:
When hanging clothing from the hooks, do not obstruct the driver's view. Do not hang heavy objects from them, to avoid the risk of personal injury if the car is braked suddenly.
c
Cars with catalytic converter
The catalytic converter reduces pollutant emissions in the exhaust.
Cars equipped in this way must always be run on unleaded fuel only.
Even a very small amount of lead will permanently damage the oxygen sensor and catalytic converter.
To ensure that the engine always operates correctly and reliably, and to avoid damaging it, the following instructions should complied with: d d d d
Do not run the fuel tank dry.
Switch off the engine at once if misfiring occurs.
Never tow-start the car unless the engine is cold, or else unburned fuel may reach the catalytic converter. It is always preferable to use jumper leads from another car or a separate battery to start the car.
Avoid any other situations in which unburned or only partially burned fuel could pass through the engine, for example: frequent operation of the starter for very short periods or repeated attempts to start if the engine does not fire. (However, switching off an engine which is running normally and restarting it again shortly d afterwards is perfectly acceptable.)
Running the engine with a spark plug lead detached.
Always have the specified maintenance work carried out at the stated intevals.
If unburned fuel reaches the catalytic converter as a result of misfiring or fuel-air mixture preparation malfunctions, overheating and damage may result.
a
High temperatures occur on all vehicles equipped with a catalytic converter. Make sure that no easily combustible material (for example hay, leaves, grass etc.) comes into contact with the hot exhaust system when the car is being driven, is idling or is parked. If this material were to ignite and cause a fire, very severe injuries or damage could result.
Do not remove the heat shields from the exhaust system, or apply underseal to them.
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Car radio operation*
For adjustments to your car radio and correct operation of its controls, please refer to the accompanying operation manual.
The reception and reproduction quality of any mobile radio installation depends on the range of the transmitter you wish to pick up and the alignment of the aerial.
Interference from high-tension overhead wires, but also buildings and natural obstructions, may cause noise and signal deterioration which cannot be avoided even if the vehicle's own interference suppression systems are in good working order.
Climatic influences such as sun spots, fog, rain or falling snow also influence radio reception.
The MW, LW and SW wavebands can be heard a long way from the transmitter, because the signals spread out both as ground waves and through the air, reflected by the ionosphere.
VHF (FM) reception provides far higher listening quality than any of the
AM wave bands. However, a VHF transmitter's range is limited to about
100 kilometres, since the signals travel only by line of sight.
Car phones not recommended by
BMW or other mobile phones could cause radio interference. This takes the form of a low-pitched humming in the loudspeaker system.
Car phone*
Mobile communication systems (car telephones, two-way radio etc.) can cause interference if they are not approved for use in your car. Since
BMW cannot examine and test each product, it is unable to accept any responsibility for the installation of items it has not approved. Before purchasing any such equipment you are recommended to consult your BMW service station.
Furthermore, in order to safeguard your
BMW's operating reliability, do not operate any in-car telephones or other mobile radio equipment with an aerial inside the car or with an aerial which is not attached to the outside of the car.
Detach the car phone aerial before driving on to a car train.
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Engine compartment lid
Releasing
Pull the lever at the left under the fascia.
a
Switch off the engine and allow it to cool down before performing any work inside the engine compartment.
Always disconnect the batteries before any work is commenced on the electrical system, particularly inside the engine compartment. Careless or incorrect handling of parts and materials when working on the car represents a personal safety risk. Please study and comply with the relevant instructions. If you are not familiar with the regulations governing the intended work, entrust it to BMW
Service instead.
c
To open:
Press the two sliding catches (arrows) to the rear and raise the lid.
Engine compartment light
This comes on when the engine compartment lid is raised, if the car's main lights are on.
To close:
Press both sides of the hood panel down at the same time until it is heard to engage.
a
When closing the engine compartment, keep the hands clear of the apertures for the pop-up headlights, or injury may result.
Should you notice while driving the car that the engine compartment lid is not properly secured, stop at once and close it correctly.
c
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Identification number Type plate
In the engine compartment, on the right side panel next to the rear edge of the right pop-up headlight unit.
The data on the type plate must agree with those in the car's documents.
The car's data are needed as a reference for all queries, checks and spare part orders.
Vehicle identification number
This is located in the engine compartment, behind a gusset plate and next to the right windscreen wiper pivot shaft (arrow); it may also appear on the top of the fascia, at the left.
91
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Engine compartment - BMW 840Ci
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Engine compartment - BMW 840Ci
1 Fuse box
2 Brake fluid reservoir
3 Oil reservoir for brake system and steering hydraulics
4 Engine oil dipstick
5 Coolant level equalizing tank
6 Engine oil filler cap
7 Windscreen washer fluid reservoir
(The reservoir for the headlight cleaning system is in the luggage compartment)
8 Reservoir for intensive cleaning system
9 Connection for jump starting
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Engine compartment - BMW 850Ci, 850CSi
Online Edition for Part-No. 01 41 9 790 191 - © 12/98 BMW AG
Engine compartment - BMW 850Ci, 850CSi
1 Fuse box
2 Connection for jump starting
3 Brake fluid reservoir
4 Oil reservoir for brake system and steering hydraulics
5 Engine oil filler cap
6 Coolant level equalizing tank
7 Reservoir for intensive cleaning system
8 Windscreen washer fluid reservoir
(The reservoir for the headlight cleaning system is in the luggage compartment)
9 Engine oil dipstick
95
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Engine oil
Motor- checking oil level
Like fuel consumption, engine oil consumption depends on driving style and operating conditions.
The oil level should therefore be checked regularly, approximately every 1000km (approx. 600 miles), or sooner if the car has been driven hard. The car should stand on a flat, level surface.
Maximum measuring accuracy:
Before a cold engine is started.
If the engine is already at its normal operating temperature, wait a short time so that the oil can drain back in the sump (for instance while refuelling).
Push the dipstick fully into its tube.
Examine the oil level: it must be between the two dipstick marks.
Motor- adding engine oil
Do not add more oil until the level has fallen almost to the lower mark on the dipstick. However, the oil level must not fall below the minimum level mark.
The space between the two dipstick marks represents approx. 1 litre
(1.8 Imp. pints) of oil. Never add oil beyond the upper dipstick mark. Adding too much oil will harm the engine because it will be burned off more rapidly, thereby implying that consumption was too high.
BMW engines are designed not to need separate additives in the engine oil, and adding these substances could even be harmful. The same applies to the gearbox or automatic transmission, the final drive and the power steering.
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Engine oil
Engine oil specifications
The grades of engine oil to be used are exclusively governed by the
CCMC or API specification.
Required quality stages:
Preferred:
CCMC-G4
CCMC-G5
CCMC-G4/PD2
CCMC-G5/PD2
Also permitted
API SG
API SH
API SG/CD
API SG/CE
API SH/CD
API SH/CE
When disposing of used oil, please comply with environmental protection laws.
Recommendation:
Always have oil changes carried out by the BMW Service station.
Viscosities
(The oil's liquid density, as shown by the SAE classification)
The choice of SAE grade depends on the average air temperature at the time of year.
The correct SAE grade is shown in the chart.
Note that the temperature limits indicated for the various SAE grades can be departed from for brief operating periods.
a
In laboratory tests, prolonged contact with used oils has caused cancer. For this reason, always wash the affected skin areas thoroughly with soap and water after work. Keep oils, greases etc. out of children's reach and in vessels marked with a suitable warning.
c
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* Engine oils toCCMC-G5 or CCMC-G5/PD2 specification, individually approved by BMW
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Hydraulics and ARK*
d d
Correct the oil level if necessary. Top up only with Pentosin CHF 11 S or, if not available, LHM – never use brake fluid.
Place the lid back on the reservoir and tighten the knurled nut. Make sure that the lid is correctly seated.
Checking oil level for brake system and steering hydraulics
d d d
With the engine stopped, unscrew the knurled nut and take the lid off the reservoir.
Depress the brake pedal about
10 times until the oil level in the reservoir no longer rises and increased resistance is felt at the pedal.
Check oil level: it must be about
20 mm (0.8 in) below the rim of the reservoir.
Oil for brake system, steering hydraulics and ARK*
(ARK = Active Rear Axle Kinematics)
If the display CHECK P.A.S. FLUID appears on the MID, consult BMW
Service.
In an emergency: d d d d
With the engine stopped, unscrew the knurled nut and take the lid off the reservoir.
Add 0.25l Pentosin CHF 11S or, if unavailable, LHM.
If the display remains visible in the
MID, add a further 0.25l.
Place the lid back on the reservoir and tighten the knurled nut. Make sure that the lid is correctly seated.
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Brake fluid
Fill to the upper MAX mark (level can be checked from the outside).
BMW Service points are familiar with the factory-approved brake fluids
(DOT 4).
a
Brake fluid is hygroscopic, that is to say it absorbs moisture gradually from the air. To ensure that the brake system remains fully operational, the brake fluid must be renewed every
2 years by BMW Service.
c
Please note the instruction on Page
a
Brake fluid is toxic and attacks the car's paintwork. Keep it in sealed original packs, out of reach of children. When disposing of brake fluid, comply with environmental protection laws.
Do not spill brake fluid; fill the reservoir only up to the MAX mark. If brake fluid comes into contact with hot parts of the engine, it can ignite and cause serious burns.
c
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Coolant
Coolant level with engine cold (app.
20 6 ):
Unscrew the reservoir cap.
The coolant level is correct if the top end of the red float rod is level with the top edge of the filler pipe (see arrow in illustration, or drawing on tank).
The coolant consists of water to which a long-life antifreeze and corrosion inhibitor has been added. The 50:50 mixing ratio must be maintained all the year round to ensure protection against corrosion. No other additives are needed.
Renew the coolant every 3 years.
Adding coolant to system:
Open the cap on the equalizing tank only when the engine has cooled down. The pointer of the coolant thermometer must be in the blue zone, or else there is a risk of scalding.
d d
Turn the filler cap counter-clockwise slightly until the excess pressure has escaped, then remove it.
If the level is too low, add coolant slowly until the level is correct – do not overfill.
a
Never fill the cooling system when the engine is hot. To avoid the risk of possible subsequent damage, use only factory-approved long-life antifreezes and corrosion inhibitors containing no nitrites or amino compounds. BMW Service points are familiar with these products. Antifreezes and corrosion inhibitors are toxic. Store them only in the original packs, out of reach of children.
Long-life antifreeze and corrosion inhibitor contains the flammable component ethylene glycol. Take care not to spill long-life antifreeze and corrosion inhibitor on hot parts of the engine, otherwise it can ignite and cause serious burns.
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Fluid for washers and cleaning systems
Combined windscreen and headlight cleaning system*
Add fluid at the filler pipe in the luggage compartment cutout (see next picture).
On vehicles with ARK (Active Rear
Axle Kinematics) the front reservoir can also be reached directly for filling.
Capacity app. 9.0litres (15.8 pints), or app. 6.0l (10.5 pints) on vehicles with
ARK.
Intensive cleaning system (1)
Small cap
Capacity app. 1.0litre (1.8 pints).
Fill with intensive cleanser (for frost protection down to app. -27 6 , available from BMW Service).
Windscreen washer (2)
Large cap
Capacity app. 2.5litres (4.4 pints).
Fill with water and add antifreeze if required (comply with the manufacturer's instructions).
b
It is advisable to mix the washer fluid before adding it to the systems.
c
Fill with water and add antifreeze if required (comply with the manufacturer's instructions).
a
Only add cleaning agents and antifreeze after diluting with water, e. g. never in their concentrated form, to prevent causing any damage to the rear light.
c b
Do not operate washers when the reservoirs are empty.
c
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Washer jets
Windscreen washer jets
The jets of liquid should strike the windscreen in such a way that reliable cleaning is assured even at high speeds.
Correct the jet position if necessary by inserting a suitable implement (e. g. a needle) and moving the jet as required.
Headlight cleaning system jets
Have these jets adjusted by BMW
Service if necessary.
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Power steering
If the steering is stiff to turn: check oil
If steering is stiff when the steering wheel is moved rapidly:
Always have the car checked by BMW
Service.
Special instruction for Servotronic*
If steering becomes lighter as speed increases:
An electronic fault has occurred.
a
If the power assistance should fail, greater effort will be required at the steering wheel.
c
Brakes
If the warning light for the brake and steering hydraulics comes on and
LOW BRAKE FLUID is displayed on the MID:
Brake fluid has been lost from the system, causing pedal travel to increase.
Failure of one brake circuit
Brake pedal travel increases and higher pedal pressure is needed.
The car can still be braked effectively with the intact brake circuit.
However, you should take the car to
BMW Service without any delay if a brake system malfunction occurs.
If the warning light flashes and the
MID displays BRAKE ASSIST INACT., the following faults may have occurred: d d d
If increased brake pedal pressure is needed: loss of reservoir pressure, no brake servo action
If the power steering becomes heavier to turn: loss of system pressure, no power asistance
If brake pedal pressure is higher and the steering heavier to turn: the hydraulic pump has failed or the V-belt has broken.
If the MID displays BRAKE LININGS:
The brake pads are worn. Have them renewed without delay.
a
Use only brake pads approved by BMW, or else the driving safety can be impaired.
c
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Batteries
The two batteries are located behind the side trim panels in the luggage compartment. There is a positive terminal connection in the engine compartment, to which a jump-start lead can be attached if necessary (see
The batteries are maintenance-free to
German DIN 43539/2 standard, that is to say their acid content normally lasts for the lifetime of the battery.
If the acid level drops too low, for instance if the car is used for lengthy periods in a hot climate, top up with distilled water (not acid).
Acid level: up to the MAX mark on the outside of the battery in each cell
(app. 5mm above the tops of the plates of the cells).
Keep the tops of the batteries clean and dry.
a
Never disconnect one of the batteries only. Before removing, either detach the negative terminals at both batteries or their common earth
(ground) strap at the body (see arrow).
c
Before taking off the right-hand luggage compartment side trim, separate the plug connector for the manual fuel filler flap release at the cable (arrow).
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Batteries
Q Read the following instruction before undertaking any work on the batteries:
R
Always wear eye protection.
No particles containing acid or lead should be allowed to reach the eyes.
S
Battery acid is highly toxic.
Wear protective gloves and suitable glasses or goggles.
Do not tilt the battery, otherwise acid could leak out through the gas vents.
T
Keep children away from batteries.
U
Avoid fire, sparks, or naked flames close to the battery.
Do not smoke. Try to avoid sparks when using cables or from other elctrical equipment. Avoid shortcircuits. Never short-circuit the battery terminals. The powerful arc which results could cause severe injury.
V
When the batteries are charged, a highly explosive gas mixture is emitted and can detonate.
W If any splashes of acid reach the eyes, rinse them out immediately for some minutes with clean water. Consult a physician without delay. Neutralize acid spillage on the skin or clothes immediately with soap and rinse off with plenty of water. If acid has been swallowed, consult a physician immediately.
X
To protect the battery case from ultraviolet rays, keep batteries away from direct daylight. As batteries which have run flat could freeze, store in a place where there is no risk of frost damage.
Removing and installing
a
Never detach the battery leads when the engine is running, or else an overvoltage will occur and damage the car's electronic equipment beyond repair. c
When removing, first disconnect the negative poles, then the positive poles and pull off the degassing tank at the side. Unscrew the battery retaining clamp.
When installing, make sure that the batteries are firmly secured, then connect the positive poles first, followed by the negative poles.
Recharging the battery
Recharge the batteries in the car only with the engine stopped. On cars with a connection provided in the engine compartment it is easier to recharge the batteries by way of this connection and the earthing point in the engine compartment (see "Starting with a flat bat-
a
To avoid short-circuits, disconnect both negative terminals from each battery or detach the common earth
(ground) cable before starting any work on the electrical system.
c
If the car is to remain out of use for more than four weeks, disconnect the batteries from the car's electrical system by detaching the batteries' negative post clips.
If the car is to remain out of use for more than six weeks, remove the batteries, recharge them and store them in a cool place (but protected against frost). Recharge the batteries at least every three months, or they will be rendered useless. Every time the battery goes flat, particularly if left in this state for any length of time, its operating life is reduced.
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Batteries
If one of the batteries is defective or has to be renewed, two new batteries of identical make and type must always be installed.
A
Return discarded batteries to a collecting point for used batteries or to
BMW Service. When filling, always carry or store batteries upright. Protect batteries against falling over when in transit.
c a
Periods of time in which the car's battery is disconnected are disregarded by the service interval indicator when calculating the need for brake fluid renewal.
Take any such periods into account with regard to the two-yearly brake fluid renewal interval, and do not wait until the clock symbol lights up.
c
Fuses
If an electrical consumer fails, switch it off and check its fuse.
The fuse box (electrical distribution box), with spare fuses, relays and plastic pincers, is on the left inside the engine compartment.
d d d
Press the retaining flap in and lift off the cover.
Use the plastic pincers to remove the blown fuse from its holder.
A blown fuse can be recognized by its melted metal wire.
There are more fuses behind the left trim panel in the luggage compartment. On cars with Check Control and a trailer tow hitch, there are additional fuses for the trailer lights in the trailer module in the luggage compartment, behind the left side trim. The fuse for the permanently positive line is located next to the battery, in a separate fuse box.
A list of fuses with ratings in Amps and details of the electrical consumers supplied is given on each fuse box cover.
a
Never attempt temporary repairs to fuses with unsuitable materials.
c
If a fuse blows several times in succession, ask BMW Service to trace and rectify the fault.
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Toolkit
Under the luggage compartment lid. accessible after unscrewing the wing bolt.
Warning triangle*
Space is provided in the toolkit to accommodate the warning triangle in an accessible position.
a
Please note that you may be required by law to carry a warning triangle on the car.
c
Fire extinguisher*
107
There is a mounting on the driver's seat.
To ensure full operating reliability, have the fire extinguisher examined by a service station authorized by the manufacturer every 2 years.
If these service stations are not listed on the extinguisher or in any documentation available to you, please consult a local trade directory or the yellow pages of the telephone service to obtain the address.
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First aid box* Tow-starting and towing away
Between the rear seats. Pull the catch
(arrow) down and swing the cover forwards.
a
Certain items in the first aid kit have a limited useful life. Please check the contents regularly and renew lifeexpired items in good time. Replacements can be obtained from any pharmacy.
Comply with legal requirements concerning the need to carry a first-aid kit in the car.
c
The screw-in towing eye is kept in the toolkit and must always be carried. It can be attached to the car at the front or rear. a fully.
c
Always screw in the towing eye
Screwing in at front
Pull the left side of the cover out and remove it.
Screwing in at rear
Press the cover down at its left and right ends by inserting a screwdriver into the upper joint line (see arrows in picture).
On cars with a trailer tow hitch, the threaded hole is next to the ball head mounting.
To insert the cover, place it in the guide at the bottom and press in at the top.
For towing, either a rigid towbar or a nylon rope or tape should be used
(the latter have the advantage of being resilient, so that peak loads are avoided).
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Towing with a rigid bar:
The towing eyes of both vehicles should be on the same side.
If the towbar has to run at an angle, note the following: d d d d
Clearance may be restricted when turning corners.
If the towbar runs at an angle, lateral forces will be generated (these may be critical on a slippery surface).
To compensate for towbar angularity, the two vehicles cannot always be driven one directly behind the other.
If the towing vehicle's brakes are applied, the other vehicle may overrun it or skid sideways.
a
The towed vehicle should not be heavier than the towing vehicle.
c
Tow-starting
Cars with catalytic converter should only be tow-started if the engine is cold. It is always preferable to use jumper leads from another car or a separate battery to start the car.
1 Switch on the hazard warning flashers (comply with national regulations regarding their use).
2 Turn the ignition key to position 2.
3 Select third gear.
4 Keep the clutch pedal down. When the car is moving, gradually release the clutch pedal. When the engine has fired and is running, depress the clutch pedal again.
5 Switch off the hazard warning flashers.
Have the cause of the starting problem traced and rectified by BMW
Service.
Cars with automatic transmission
These cars cannot be tow-started.
For starting with a flat battery, see next page.
Towing away
1 Turn the ignition key to position 1 so that the brake lights, turn indicators, horn and wipers can be operated.
2 Switch on the hazard warning flashers (comply with national regulations regarding their use).
If the car's electrical system has failed, display a warning notice to the rear or place the warning triangle in the rear window.
b
Please make sure that the ignition key is turned to position 1 even if the electrical system has failed, to prevent the steering from locking.
c
Cars with automatic transmission
d
Move the selector lever to N.
Maximum towing speed: 50 km/h
(app. 30 mile/h)
Maximum towing distance: 50 km
(app. 30 miles) a
When the engine is not running, there is no power assistance and the brake servo is out of action. The steering and brakes will require extra effort to operate.
c
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Starting with a flat battery
Do not use spray products sold as an aid to starting.
If the car's own battery is flat, the engine can be started by using two jumper cables from another vehicle's battery.
a
Touching electrically live components while car's engine is running can cause a potentially fatal accident.
c
Do not depart from the procedure described below, or else personal injury could result or one or both vehicles be damaged.
1 Check that the other vehicle has a
12 Volt battery of approximately the same capacity (65Amp/h). This should be printed on the battery.
2 Do not disconnect the flat battery from the car's electrical system.
3 The bodies of the two vehicles must not touch, or a short circuit could result.
4 First connect the positive terminal of the other car's battery with one of the jumper leads to the positive pole in the BMW's engine compartment (this has a protective cover marked + which can be removed by pulling the flap (BMW
850Ci, 850CSi) or by pulling the two flaps at the side (BMW 840Ci - see left picture, arrow 1).
Then connect up the batteries' negative terminals. First attach the jumper lead to the negative terminal of the other vehicle's battery or to the other car's engine or body earth and then to the engine or body earth (nut on spring strut dome, see picture, arrow 2) of your own car.
a
When connecting up jumper leads, including when assisting other vehicles, please work in the sequence stated above in order to prevent sparks occurring at the battery.
c
5 If the second vehicle's battery is not well charged, run that vehicle's engine. Start your own car's engine in the usual way and leave it running.
Before detaching the jumper leads from your BMW, switch on your car's lights, heated rear window and heater blower (at maximum speed) to ensure that the voltage reaching the consumers from the regulator is not too high.
Then disconnect the jumper leads in the opposite order (negative pole first, then positive pole).
Have the battery recharged (depending on the cause of the fault).
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Changing a wheel
a
The car should ideally be positioned on a level, firm surface which affords a good grip if a wheel is to be changed. On a soft or slippery surface
(snow, ice, tiles or similar) the car or the jack could slip sideways.
The car jack should likewise rest on a firm surface.
Do not position wooden blocks etc. beneath the jack, as its maximum load capacity could otherwise be exceeded. Never lie under the car or start the engine when it is jacked up; a very severe or fatal injury could result.
Additional safety precautions in the event of a flat tyre:
Where possible, take the car off busy roads and away from moving traffic.
Allow the steering lock to engage in the straight-ahead position, apply the handbrake and select first or reverse gear or automatic transmission selector lever position P.
Switch on the hazard warning flashers
Request all occupants to leave the car and to wait in a safe place (e.g. behind roadside crash barriers).
If necessary, set up the warning triangle or a flashing warning light at a sufficient distance to the rear. Comply with national legislation in these respects.
c
Jack
In the luggage compartment, behind the left trim.
To avoid rattling noises later, note how the various tools are attached to the car and replace them in precisely the same positions afterwards.
Pull the trim away at thr pre-formed cutout. Release the spring clip (arrow) and take out the jack.
After use, lower the jack fully, place its base in the holder and press it forwards.
Spare wheel and hexagon adapter
These are both under the mat in the luggage compartment. Take out the mat.
Take off the black hexagon adapter, unsrew the wing nut by hand and remove the wheel.
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Changing a wheel
Wheel changing procedure:
1 Take off the wheel stud cover by applying the hexagon adapter and stud wrench to it and turning to the left. For thiefproof wheel studs, see Page 105.
2 Slacken the wheel studs by half a turn.
3 Press in and remove the jack attachment socket cover at the appropiate point of the car (arrow).
4 Insert the jack fully into the socket and position it so that the base is resting firmly on the road.
5 Raise the car's body with the jack until the wheel to be changed is clear of the road.
a
Use the jack only for wheel changing. Never attempt to lift another type of car or any other heavy object with it, as this could lead to accidents and personal injury.
Do not lie under a jacked-up car – a very severe or fatal injury could result.
c
6 Take out the wheel studs and remove the wheel.
7 Insert the centering pin from the car's toolkit into one of the threaded holes, with the plastic cap in position on it.
8 Offer up the new wheel, insert at least two of the studs at opposite points and take out the centering pin.
For light alloy wheels with turbine styling or with a directional turbinestyle cover, please note:
These wheels or covers are asymmetric, and therefore intended to rotate in one direction only. The spare wheel matches the wheels on the right of the car; the spare wheel for the BMW 850CSi does not have a cover.
The wheel illustrated is on the left of the car.
If a puncture has occurred, the BMW
850Ci's spare wheel can also be fitted on the left of the car, but a wheel which rotates in the intended direction should be fitted instead as soon as possible.
Online Edition for Part-No. 01 41 9 790 191 - © 12/98 BMW AG
Changing a wheel
The wheel cover can only be fitted by
BMW Service or a specialist workshop.
Wheel stud wrench and centering pin
In the toolkit underneath the luggage compartment lid.
265/40 ZR 17 rear tires
In the event of a puncture, it may be necessary to use the spare wheel with a 235/45ZR17 tyre at the rear.
Although this wheel can be used entirely satisfactorily in all load and speed ranges, one with a tyre of size
265/40ZR17 should be fitted in its place as soon as possible.
9 Screw in the remaining wheel studs and tighten them all in a crosswise pattern.
10 Lower the car, remove the jack, insert the jack attachment point cover with the flap at the bottom and press it in at the top.
11 Tighten the wheel studs fully, working in a crosswise pattern.
a
For safety reasons, the wheel studs should be checked with a calibrated torque wrench without delay to ensure that the specified tightening torque of 100Nm (74 lb.ft.) has been reached. If a new wheel (for instance the spare wheel) is fitted for the first time, check the tightening torque again after the car has covered
1000km (about 600 miles).
c
12 Centre the wheel stud cover and attach. Push it on and turn to the left or right until wheel cap locks into place. Cross-spoke wheels: align with the arrow marked on the wheel stud cover with the line marked on the wheel and push on the wheel cover.
When replacing a wheel in the spare wheel well, make sure that the central threaded rod in the well is not bent or damaged.
If your car is equipped with wheels other than Original BMW light-alloy wheels, make sure that the correct wheel studs are used.
Have the flat or defective tyre repaired or replaced as soon as possible, and the new tyre balanced on the wheel.
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Thiefproof wheel studs
The code number is embossed on the front of the adapter. Please make a careful note of this number and keep it in a safe place, in case the adapter is lost.
Fuel filler flap
Manual release
Take the pull wire (arrow) out of the luggage compartment trim and pull it to the rear.
1 Stud cap (not for wheels with wheel stud cover)
2 Wheel stud for adapter
3 Adapter (supplied in toolkit)
To remove:
1 Turn the cap (1) slightly to the left with the wheel stud wrench and remove it.
2 Take adapter (3) from the car's toolkit and insert it into the wheel stud.
3 Unscrew the wheel stud (2).
After inserting and tightening the wheel stud again, remove the adapter and press on the stud cap.
Online Edition for Part-No. 01 41 9 790 191 - © 12/98 BMW AG
Luggage compartment Sliding/tilt sunroof Headlights
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Manual release
1 Insert the master key into the lock next to the release button.
2 Turn the key and remove it again in the position in which it was inserted.
3 Press the lock barrel in.
The luggage compartment locks again as soon as it is closed.
b
If the thiefproofing system has been activated, the alarm will be triggered off if the luggage compartment is opened manually.
c
Manual operation
1 Press out the interior light by insering a screwdriver into the cutout.
2 Take off the cover.
3 Use the Allen key from the car's toolkit to move the roof in the desired direction.
To ensure that the sunroof operates correctly after repair or restoration of the power supply, it has to be re-synchronized: d
Press the electric operating switch or keep it slid forwards for
12 seconds. (Do this only when synchronizing is necessary, not at any other time.)
Have the fault rectified by BMW
Service without delay.
Manual operation
1 Open the engine compartment.
2 Turn the knurled knob to the left or right until the headlight unit is fully extended or retracted (and no longer moves when the knurled knob is turned several times).
Have the fault rectified by BMW
Service without delay.
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Renewing wiper blades
4 Pull the wiper blade towards the wiper arm.
When inserting a new wiper blade, make sure that it engages securely.
1 Move the wipers to the fold-out position: Switch on the ignition.
Move the wiper control lever to position 1 (intermittent wipe).
Switch the ignition off again between wiper movements. The wipers will then move up to an almost vertical position.
2 Lift the wiper arm away from the glass and hold it securely.
3 For the driver's side wiper, pull the outer spring keeper first and then the inner one (arrow) until the wiper blade is released. There is only one spring keeper on the passenger's side wiper.
Online Edition for Part-No. 01 41 9 790 191 - © 12/98 BMW AG
Bulb changing
Bulbs and lights are crucial safety features of your car. Appropriate care and attention should therefore be taken when handling these components. If you are unfamiliar with such tasks, it is better to entrust them to BMW
Service.
b
Do not touch the glass of new bulbs with bare fingers. Use a clean cloth, paper tissue or similar, and hold the bulb otherwise only by its base.
c
A box containing spare bulbs is available from BMW Service.
a
Whenever carrying out any work on the car's electrical system, always switch off the consumers in question or disconnect the battery's negative terminal, otherwise there is a risk of causing short-circuits.
Observe any instructions supplied by the bulb manufacturer, to avoid causing injury or damage when changing bulbs.
c
Pop-up headlights
Outer: Low beam headlights
Centre: Fog lights
Inner: High-beam headlights
Each has one H 1, 55 Watt bulb.
Take off the painted upper section of the pop-up headlight:
1 Remove the screw and raise the upper section slightly.
2 Push the upper section forward and take it off.
a
When attaching the painted upper section of the pop-up headlight, make sure that it is seated correctly – particularly at the front mountings – and that the toggle fastener is properly closed by rotating it through a quarter of a turn. c
Low beam headlight (1) and fog light (2)
a
Protective eyewear and gloves should be worn when handling this bulb, If the bulbs are damaged, injury may be caused.
c
1 Pull the flap and take off the cover.
2 Pull off the plug.
3 Release the spring wire clip.
4 Change the bulb.
When attaching the cover again, press it on uniformly all around.
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Bulb changing
High beam headlight (3)
a
Protective eyewear and gloves should be worn when handling this bulb, If the bulbs are damaged, injury may be caused.
c
1 Turn the cover to the left and take it off (bayonet catch).
2 Pull off the plug.
3 Press the spring wire clip and disconnect it.
4 Change the bulb.
Lighting strip
Inner: high beams/headlight flasher
H1, 55 Watt bulb
Centre: side and parking light/daytime driving light
*
21/5 Watt bulb
Outer: Left/right flashing turn
21 Watt bulb
Removing:
1 Pull the grille out forwards.
2 Take out the two Phillips-head screws (arrows).
3 Pull the lighting strip out forwards, pivoting it slightly towards the outside of the car and removing it from the guide.
High beam/headlight flasher (1)
1 Press the cover away from its fastenings with a screwdriver.
2 Disconnect the cable.
3 Release the spring wire clip and change the bulb.
Side and parking light/daytime driving lights (2)
1 Turn the bulb holder to the left and remove it.
2 Press the bulb in slightly and turn it to the left to remove.
Flashing turn indicator (3)
1 Press the bulb holder in slightly and turn to remove.
2 Remove the bulb in the same way.
Online Edition for Part-No. 01 41 9 790 191 - © 12/98 BMW AG
Bulb changing
Side lights
5 Watt bulb
1 Press the light unit forward at its rear edge, and remove it to the side.
2 Press the bulb in slightly, turn to the left and remove.
Rear lights
1 Rear fog lights
2 Brake lights
3 Rear lights and reflectors
4 Turn indicator
5 Reversing lights
Rear lights: two 5 Watt bulbs
Other lights: 21 Watt red red red yellow white
Lights at side:
1 Take off the trim by holding the pre-formed grip area and pulling.
2 Press the appropriate bulb holder in slightly and turn to the left to remove.
3 Remove the bulb in the same way.
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Bulb changing
Lights in the luggage compartment lid:
1 Raise the trim (quick-release fastener).
2 Press the appropriate bulb holder in slightly and turn to the left to remove.
3 Remove the bulb in the same way.
Central brake light
21 Watt bulb
1 Open the luggage compartment lid.
2 Press the bulb holder slghtly, turn to the left and remove.
3 Remove the bulb in the same way.
Licence plate lights
5 Watt bulb
1 Remove the Phillips-head screws.
2 Take off the glass surround with rubber seal.
3 Pull the bulb out of the contact tongues.
Online Edition for Part-No. 01 41 9 790 191 - © 12/98 BMW AG
Bulb changing
Footwell lights
5 Watt bulb
1 Lever the glass carefully out with a screwdriver (arrow).
2 Pull the bulb out of the contact tongues.
Interior lights at front
Interior light (10 Watt bulb) with reading lights (10 Watt bulbs)
1 Press the light out at the cutout on the left with a screwdriver.
2 Interior light: press the plastic lug for the reflector back, swing up the reflector and take out the bulb.
3 Reading light: press the bulb in slightly, turn to the left and remove.
Interior lights at rear
10 Watt bulb
1 Press the light out at the side recess with a screwdriver.
2 Swing up the reflector and take out the bulb.
Luggage compartment lights
10 Watt bulb
Light on underside of rear-window shelf:
1 Press it out with a screwdriver at the recess provided.
2 Change the bulb.
Lights in the luggage compartment lid:
1 Pull off the glass.
2 Change the bulb.
Engine compartment light
10 Watt bulb
1 Press the black lug on the glass towards the centre with a screwdriver and take off the glass.
2 Take out the bulb.
Glove box light
5 Watt bulb
1 Press the light out of the lower glove box by applying a screwdriver to its outer edge.
2 Change the bulb.
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Winter operation
Changeable weather in the winter months not only calls for a suitably cautious style of driving but also for certain measures to be taken on the car, to ensure that it can be driven safely and without problems throughout the winter.
Coolant
Make sure that the required mixing ratio of 50 to 50 parts of water and long-life antifreeze and corrosion inhibitor is present in the system all the year round. It provides protection down to a temperature of app. -37 6 .
Renew the coolant every 3 years.
Locks
Do not use de-icer, as it has a degreasing effect and will impair the functioning of the locks.
Rubber parts
To prevent the seals from freezing together, treat rubber surfaces with a rubber care product or silicone spray.
b
Suitable care products are available from BMW Service.
c
Snow chains*
BMW snow chains
*
, if used, must only be fitted to both rear wheels (with summer or winter tyres), making sure that the manufacturer's safety instructions are observed. Do not exceed
50km/h (31 mile/h) with snow chains fitted. To enhance traction, it is best to switch off ASC+T/DSC if snow chains
Moving off
To move away in deep snow or to
"rock the car free" it is best to switch
Driving on slippery roads
Operate the accelerator pedal sensitively, avoid high engine speeds and shift up to the next higher gear early.
On uphill or downhill gradients, select the next lower gear in good time.
Maintain a generous distance from the vehicle in front as a safety precaution.
Brakes
Winter road conditions greatly reduce the amount of tyre grip that is available, so that the driver must expect braking distances to be considerably longer than usual in every situation.
ABS prevents the wheels from locking, so that the car remains stable and can always be steered. Should the
ABS fail and the road wheels lock, reduce pressure on the brake pedal immediately so that the wheels can still turn although they are being braked. Then increase pedal pressure again until the same situation occurs, and repeat this as often as necessary.
This cadence braking principle cuts braking distances and keeps the car steerable, so that you can try to drive round obstructions at reduced braking pressure.
a
Do not shift to a lower gear as a means of braking the car if the road surface is slippery, or the rear wheels may slide and control of the car may be lost. ABS and ASC+T/DSC cannot prevent this situation, as they do not influence this method of slowing down the car.
c
Online Edition for Part-No. 01 41 9 790 191 - © 12/98 BMW AG
Winter operation
b
When applying the brakes hard on slippery roads or if the amount of surface grip varies widely, always declutch as well.
c
If the car skids
Take your foot off the accelerator and depress the clutch or move the automatic transmission selector lever to N.
Try to steer into the skid and bring the car under control in this way.
Parking
Select the 1st gear or reverse, or move the automatic transmission selector lever to P. If the car is parked on a slope, apply the handbrake as well. To prevent the handbrake linings from sticking to the drums as a result of frost or corrosion, dry the drums by applying the handbrake lightly as the car is coming to halt.
a
The brake lights do not come on when the handbrake is applied.
c
Towing a trailer
When a trailer is towed, the demands on both car and driver are more severe.
A trailer reduces manoeuvrability, the ability to climb hills, acceleration and braking capacity and makes the car handle and corner differently.
The trailer load limit and the permissible nose weight (towbar downthrust) are stated in the "Technical Data",
Page 149. The trailer load limit is also
recorded in the car's registration document. Consult BMW Service regarding increased trailer weights.
Trailer tow hitch*
The trailer tow hitch
*
with detachable ball head should be of BMWapproved pattern and, like the trailer turn indicator repeater (which is normally a legal requirement) should be expertly installed by BMW Service.
Keep the detachable ball rod greased to make fitting and removal easier.
Both the comfort and sport suspension settings of your BMW afford optimum safety, ride quality and consistency of handling. They are also perfectly suitable for towing a trailer at up to the standard specified weight, provided that towing is restricted to one vacation period per year or thereabouts,and the driving style is modified to allow for the more severe operating conditions.
If a trailer tow hitch is retrofitted, it is also a good idea to install the trailertowing suspension. This compensates for the weight of the tow hitch and also ensures optimum road behaviour when the trailer is not being towed. It is also essential if higher trailer weights are to be towed (possible with certain types of trailer).
BMW has not approved any other suspension systems offered by the automotive trade for trailer towing purposes.
b
If a trailer tow hitch is installed, the self-regenerating action of the rear bumper system may not be able to take effect.
c
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Towing a trailer
The use of a stabilizing device can be recommended, particularly if the trailer is a heavy one. Information can be obtained from BMW Service.
Nose weight
This is the load exerted downwards by the trailer on the ball head of the tow hitch attached to the rear of the car (it can be determined with the aid of bathroom scales or similar).
In Germany a minimum nose weight of
25 kg (55 lb) is laid down by law.
If the trailer weighs more than 1600kg
(3527 lb), the nose weight must be at least 50kg (110 lb).
The nose weight limit should if possible be fully utilized but not exceeded.
The trailer's nose weight is added to the weight of the car, and must not lead to the car's gross weight limit or rear axle load limit being exceeded.
The car's payload is reduced by the nose weight if a trailer is being towed, and also by the weight of the trailer tow hitch.
Loading
When loading the trailer, make sure that the weight is kept as low as possible and stowed if possible close to the axle.
A low centre of trailer gravity makes the outfit much more stable and safe to drive.
Do not exceed neither the trailer's gross weight (axle load) or the specified trailer load limit for the car. The smaller value is the limit which should be adhered to.
Before acquiring a trailer it is desirable to obtain from the manufacturer a guaranteed statement of the effective trailer weight and the payload limit.
Electrical system
Higher electrical consumption can be expected if a trailer (caravan) is towed.
Run high-consumption items in particular for as short a period as possible in order to avoid draining the battery.
The trailer's rear lights, brake lights and rear fog light are protected by plug-in fuses in the trailer electrical module. This is behind the left luggage compartment trim. The fuse for the permanently positive line is in the luggage compartment, next to the left battery, in a separate fuse box.
a
Always check that the trailer's rear lights are working before starting a journey.
c
Outside mirrors
The standard outside mirrors may prove inadequate for trailer towing work: the law lays down that the car should be equipped with two outside mirrors with which the rear corners of the trailer can be seen. Mirrors of this kind, including versions with adjustable arms, can be obtained from
BMW Service.
Online Edition for Part-No. 01 41 9 790 191 - © 12/98 BMW AG
Towing a trailer
Gradients
In the interests of safety and the avoidance of traffic obstructions, the maximum gradient (applicable at sea level) is limited to 12 X or, with a higher trailer load (if authorized), 8 X .
As altitude above sea level increases, engine power output tends to drop.
You should therefore take particular care when driving through the mountains, since the maximum gradient on which the outfit can be started may be lower than usual. Do not make full use of the car's and trailer's gross weight limits.
Downhill gradients
Special care must be taken when descending gradients: always shift down to the next-lower gear before reaching the gradient – if necessary, as low as 1st gear or selector lever position 2 – and drive down the gradient slowly.
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Speed limit
The maximum speed limit is 80km/h
(app. 50 mile/h) in Germany. Trailer load limits have been chosen to ensure ample driving stability up to this speed. Although higher speeds may be permitted in other countries, you are recommended not to drive faster for safety reasons.
If the trailer begins to swing from side to side, the outfit can only be stabilized by braking immediately.
Tyre pressures
Check the car's and the trailer's tyre pressures most carefully. Comply with the trailer manufacturer's tyre pressure instructions.
Cover flap
Take hold of the cover flap for the trailer tow hitch at the top cutout, pull to the rear and down (if necessary, use a screwdriver to unclip it) and remove it from the lower guide.
For attaching and removing the ball head, please refer to the separate instructions.
To attach the cover flap, first locate the groove at the bottom in the guide and then press the flap into place at the top.
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Roof rack*
A loaded roof rack alters the car's road behaviour and steering response quite considerably, by moving its centre of gravity.
When loading the roof rack, ensure that the specified roof load limit, the car's gross weight limit and the axle loads are not exceeded.
A special roof rack system is available as an accessory for your BMW. If it is used, please comply with the installation instructions supplied.
The roof load must be uniformly distributed and should not be too large in area. Heavy items of luggage should always be placed at the bottom.
Correct, secure loading of the roof rack will prevent items from shifting or falling off during the journey, and thus endangering following traffic.
Drive smoothly when there is a load on the roof: avoid violent acceleration, braking or cornering.
The roof load increases the car's surface area exposed to the wind, so that fuel consumption will be higher and the loads on the roof structure of the car more severe.
Driving on the right/left
When entering a country in which the traffic drives on the other side of the road:
1 Take off the painted upper section of the pop-up headlight: turn the toggle fastener through a quarter of a turn and lift the upper section slightly. Push the upper section forwards and take it off.
2 Take out the plug.
3 For driving on the left: move the lever to the left. For driving on the right: move the lever to the right.
a
When attaching the painted upper section of the pop-up headlights, make sure that it is correctly seated, particularly at the front mounting points, and that the toggle fastener is properly secured by rotating through a quarter of a turn.
c
Online Edition for Part-No. 01 41 9 790 191 - © 12/98 BMW AG
Licensing for use abroad ABS
Cars are always supplied to conform with the registration laws of the country in which they are intended for use.
If the owner moves to another country, it is important to check beforehand that import regulations and vehicle licensing laws do not make it too difficult to import the car.
You can obtain infrmation in Germany by telephoning 089-382-0 and stating the model, vehicle identification number and date first registered.
In other countries, please consult
BMW Service or the importer.
The anti-lock brake system (ABS) prevents the wheels from locking and thus enhances active safety. Locked wheels are dangerous, because the front wheels cannot then be steered and the rear wheels may slide sideways and cause the car to spin or slide off the road.
With ABS in action, the car achieves the shortest possible braking distances for the prevailing conditions
(straight-line braking or cornering, on asphalt, ice, wet roads etc.).
ABS is capable of satisfying two fundamental requirements whenever the brakes are applied: d d
Assured driving stability on varying road surfaces (e.g. asphalt, concrete, mud, wet roads, snow and ice).
Assured steerability and manoeuvrability in these conditions.
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However, certain important considerations must be borne in mind in connection with these requirements:
Even ABS is unable to eliminate the effects of natural physical laws. It cannot absolve the driver from the consequences of braking too late, maintaining insufficient space from vehicles ahead, exceeding the limits of adhesion when cornering at speed or encountering a poor stretch of road where aquaplaning occurs. Avoiding such situations remains the driver's responsibility.
Although ABS enhances active driving safety, this should not be regarded as an invitation to take correspondingly severe risks.
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ABS
Driving with ABS
After the engine has been started, the yellow ABS warning light on the instrument panel goes out.
The ABS system itself becomes operational above a road speed of app.
8km/h (5 mile/h). If the car's speed drops below app. 3km/h (2 mile/h), the ABS ceases to take effect, so that in the very last phase of a brake application the wheels could theoretically tend to lock, but in practice this is not critical
The ABS regulation cycle takes place within fractions of a second. The brake pedal pulsates to warn the driver that the ABS is active and therefore that the car is reaching the adhesion limit.
In addition a chattering noise is heard
– caused by the pressure regulating action – to remind the driver that the tyres' grip on the road is decreasing
(slippery surfaces) and that the car's speed may therefore need to be reduced accordingly.
a
If the road surface consists of loose material on a firm underlayer, for instance stone chippings or powdery snow, the car's braking distance may sometimes actually be longer than if the wheels were to lock.
The same applies if snow chains are fitted. However, the advantages of greater stability and the ability to steer while braking are still available to the driver.
To ensure that the ABS system always remains fully operational it must never be modified in any way, and all work on the ABS should be entrusted only to skilled, authorized personnel.
c
ABS may not function at maximum efficiency if tyres of different sizes are fitted (e.g. winter tyres/spare wheel); in such cases, revert to the correct wheels and tyres as soon as possible.
Any malfunction is shown by the yellow ABS warning light on the instrument panel coming on. The brake system continues to work normally as on a vehicle without ABS, but should none the less be examined without delay by BMW Service. Additional faults to the brake system could otherwise occur without being readily apparent.
Online Edition for Part-No. 01 41 9 790 191 - © 12/98 BMW AG
Active Rear Axle Kinematics (ARK)*
Unforeseen driving situations often call upon the driver to react swiftly by taking corrective steering action. The vehicle may be felt to respond in a surprising or unpredictable manner as a result. The ARK system modifies or prevents such reactions.
At a speed of app. 40km/h (app.
25 mile/h) or above, the ARK is activated with every movement of the steering wheel; it modifies the rear wheel lock angle and repositions the rear wheels ideally to suit the driving situation.
The optimum rear-wheel angle is calculated from the steering wheel's momentary lock angle and the vehicle's road speed; the wheel angles are then adjusted by the electrohydraulic control circuit. As a result of the vehicle's increased stability, it responds more predictably to steering wheel movements.
However, these improved driving characteristics cannot overcome the basic laws of physics to which a moving vehicle is subject. It remains the driver's responsibility not to initiate excessive steering-wheel movements or go beyond safe cornering speeds.
Each time the engine is started, the
ARK control unit runs through a selfcheck sequence. In the event of a system fault, which will be indicated by the telltale light in the instrument cluster and the display R/AXLE FAILSAFE
PROG in the MID, the lock angle of the rear wheels will no longer be adjusted. The wheels will normally remain in the straight-ahead position, with the result that the vehicle can be driven normally. In exceptional cases, the wheels could remain locked at an angle. If this occurs, the steering wheel will be slightly offset to compensate when the vehicle is travelling in a straight line. Here again, the vehicle can still be driven normally. Note, however, that in this situation the rear wheels will run slightly off-track and the vehicle will occupy marginally more road space across its width as a result.
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Minor, temporary faults can be rectified by starting the engine again to initiate the system's self-check. If the telltale light does not go out even after the engine is restarted, contact BMW
Service to have the system repaired.
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Disc brakes
Disc brakes offer maximum braking efficiency, responsive control of braking force and the ability to resist severe loads.
If the car is not driven very far, is parked out of use for lengthy periods or is mostly driven very gently, corrosion of the brake discs and contamination of the pads may unfortunately be encouraged, since the minimum pressures between pad and disc which are needed to obtain an automatic cleaning action are seldom reached.
When the brakes are applied, corroded discs tend to judder, and even lengthy brake applications usually fail to eliminate this effect entirely.
a
Use only brake pads approved by BMW, or else the car's operating permit will be invalidated.
c
Driving hints
In damp weather or heavy rain it is advisable to apply the brakes with light pedal pressure every few kilometres. When doing so, make sure that no other road-user is endangered.
This will generate sufficient heat to dry out the discs and pads.
It is a well-known fact that the best braking effect is obtained not withlocked wheels but with wheels that are still just rotating. ABS maintains this state of affairs automatically. If an
ABS malfunction occurs, the driver should adopt the cadence braking
principle if possible (see Page 122).
To avoid any risk of brake fade when descending long or steep hills, select the gear which calls for a minimum amount of braking (or shift the automatic transmission down to an equivalent speed stage).
Engine braking can be enhanced by shifting to a lower gear, if necessary as far as first gear or selector lever position 2.
If engine braking alone is insufficient, do not apply the brakes for too long with only slight or moderate force.
Instead, it is better to brake the car quite hard (providing that the road behind you is clear) so that your speed is reduced noticeably, and to repeat this process at brief intervals as necessary. The cooling-down phases between these brake applications should avoid overheating and maintain full braking efficiency.
a
Never hold the clutch pedal down, move the gearbox or automatic transmission into neutral or – an even more dangerous practice – switch off the engine while the car is in motion.
Engine braking is lost in neutral, and there is no brake servo effect when the engine is stopped. Make sure that the full travel of the brake, clutch and accelerator pedals is never obstructed by the floor carpet, loose mats or any other items.
c
Online Edition for Part-No. 01 41 9 790 191 - © 12/98 BMW AG
Tyre pressures
Information for your safety
The factory-approved radial-ply
(braced tread) tyres have been chosen to match your car's performance and to ensure driving safety and the desired standard of ride comfort.
The condition of the tyres and maintenance of the specified tyre pressures not only influence tyre life but also road safety to a very considerable extent.
Incorrect tyre pressures are often a cause of tyre problems. They also have a considerable effect on the roadholding of your BMW.
a
Check tyre pressures regularly
(including the spare wheel) before starting a long journey and in any event at least twice a month. Failing this, incorrect tyre pressures could render the car unstable when driven or cause tyre damage which could result in an accident.
c
Tyre tread
Inspect tyres frequently for damage, the presence of foreign bodies, unusual wear and sufficient tread depth.
Tread depth should not be less than
3mm (app. 0.12 in), even if the minimum legal requirement is only 1.6mm
(app. 0.06 in). You are recommended to replace tyres when the tread depth is down to 3 mm, or else the risk of aquaplaning on even shallow water will be increased.
We recommend fitting new tyres when the treads are 3mm deep. If they remain in use, wear indicators in the base of the tread appear at a tread depth of 1.6mm as a warning that the legal wear limit (valid throughout
Europe since 01.01.1992) has been reached.
When parking the car or driving over loading ramps, workshop hoists etc., make sure that the side walls of the tyres are not damaged by violent contact with obstructions.
a
Never try to drive any further if a tyre goes flat. If air pressure is lost from a tyre, this seriously affects the car's handling and braking, and could cause the driver to lose control.
Avoid overloading the car, as this
131 could cause the tyres' load capacity limit to be exceeded. Overheating can also occur, and the tyre can suffer internal damage at a relatively rapid rate. This could lead to sudden pressure loss.
Unusual vibration while the car is being driven could indicate a tyre fault or some other defect on your car. The same applies to any other abnormal road behaviour, such as pulling severely to the right or left. In such cases, reduce speed immediately.
Proceed carefully to the nearest BMW
Service station or tyre dealer, or have the car towed there so that it can be checked or its tyres inspected.
All forms of tyre damage (which could in the worst case lead to sudden and total loss of pressure) represent a risk of serious or even fatal injury to the car's occupants and to all other road users.
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New tyres
To maintain the car's good road behaviour, always fit tyres of the same make and tread pattern to all wheels. a
Do not use retreaded tyres on this car, as they could impair its road behaviour and safety. Their carcases may differ in internal construction or have aged sufficiently to cast doubt on their durability.
c
Interchanging wheels and tyres
Tread wear patterns vary between the front and rear wheels, according to the individual conditions in which the car is operated. In the interests of safety and the best possible vehicle behaviour, you are recommended not to adopt the practice of interchanging the wheels.
If you wish to interchange the wheels for reasons of operating cost, remember that the expense incurred in interchanging the wheels also has to be taken into account when assessing whether it is worth trying to extend the tyres' operating life in this way. BMW
Service can advise you.
If you do decide to interchange the wheels, please take the following precautions:
Interchange the wheels on the same side of the car only (though the spare wheel can be included if desired).
Remember that braking efficiency and tyre grip may be adversely affected.
If tyres are interchanged in this way, the process should take place at frequent intervals (max. 5000km/3000 miles).
Always check tyre pressures after fitting, and adjust as necessary.
Spare tyres more than 6 years old should be reserved for genuine emergencies, that is to say if the car's mobility cannot otherwise be maintained. New tyres should be fitted in their place as soon as possible, and they should no longer be brought into regular service when new tyres are fitted.
A tyre's date of manufacture is shown as part of the inscription on the tyre wall:
DOT ... 413 means for instance the
41st week of 1993
Online Edition for Part-No. 01 41 9 790 191 - © 12/98 BMW AG
Choosing the correct tyres
Wheels and tyres
Use only BMW-approved tyres. In view of the car's maximum speed, certain makes and sizes are compulsory. Details can be obtained from
BMW Service. Comply in addition with any relevant national regulations.
The correct choice is made easier if the meaning of the tyre markings is understood. For radial-ply tyres, the following markings apply: e.g.
235/50 R 16 95 W
Nominal width in millimetres
Aspect ratio in X
Code letter for radial ply
Rim diameter in inches
Load capacity figure
(not on ZR tyres)
Speed code letter
(ahead of the R on ZR tyres)
The speed code letter indicates the maximum permissible speed at which the tyre is to be operated.
On summer tyres:
S = up to 180km/h (app. 112 mile/h)
T = up to 190km/h (app. 118 mile/h)
H = up to 210km/h (app. 130 mile/h)
V = up to 240km/h (app. 149 mile/h)
ZR = over 240km/h (app. 149 mile/h)
W = up to 270km/h (app. 167 mile/h)
On winter tyres:
Q M+S= up to 160km/h (app. 99 mile/h)
T M+S= up to 190km/h (app. 118 mile/h)
H M+S= up to 210km/h (app. 130 mile/h)
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Marks on light alloy wheels:
9 g J x 18 AH 2
Rim width in inches
Rim shoulder contour code letter
Symbol for well-base rim
Rim diameter in inches
A symmetric H ump on 2 rim shoulders
Tyre valves should be protected against dirt entering by attaching screw caps. Dirt in the tyre valve can often lead to a gradual loss of air pressure.
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Winter tyres
If winter tyres – (M&S radial-ply) – are fitted, the same make and tread pattern should be used on all four wheels
(and preferably on the spare wheel as well) in the interests of good directional stability and steering response.
Fit only winter tyres approved by
BMW. BMW Service will gladly advise you on the correct winter tyres for the conditions in which your car has to operate.
Always note and comply with the maximum speed limit for your winter tyres.
In Germany: a suitable warning label according to § 36 StVZO has to be attached within the driver's field of view if the car's top speed is higher.
Tyre dealers and BMW Service points can supply these labels.
Below a tread depth of 4 mm (app.
0.16 in), winter tyres become noticeably less suitable for winter driving conditions and should therefore be replaced without undue delay for safety reasons.
Note the specified tyre pressures and have the wheels with tyres balanced each time a tyre or wheel is changed.
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Always note and comply with the maximum speed limit for your winter tyres.
Lack of expert knowledge or incorrect handling of tyres can cause damage and lead to accidents.
All work on tyres should therefore be carried out only by experts. BMW
Service will gladly assist you.
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Store wheels and tyres in a cool, dry and preferably dark place when not in use. Protect tyres against contamination from oil, grease and fuel.
Online Edition for Part-No. 01 41 9 790 191 - © 12/98 BMW AG
Approved wheels and tyres
Note the tyre and wheel data in the car's official documents. If sizes not approved by the manufacturer are fitted, an entry in the car's documents may be necessary.
Fine-link BMW snow chains
*
can be fitted at the rear with either summer
(not on 850CSi) or winter tyres in use, but only to both wheels. Always observe the manufacturer's safety recommendations when fitting.
Radial-ply tyres
(tubeless)
BMW 840Ci, BMW 850Ci
Pressed-steel
(wheel)
Alloy wheel Wheel offset mm
225/55 R 16 95 Q/T/H M+S
235/50 R 16 95 W
235/50 R 16 95 Q/T/H M+S
235/45 R 17 93 W
—
—
—
—
—
—
7 1/2 J x 16 H2 15
7 1/2 J x 16 H2 15
7 1/2 J x 16 H2 15
8 J x 17 H2 10
8 J x 17 H2
8 J x 17 H2
10
10
235/45 ZR 17
235/45 R 17 93 Q/T/H M+S
265/40 R 17 96 W*
265/40 ZR 17**
BMW 850CSi
235/45 ZR 17
235/45 R 17 93 Q/T/H M+S
—
—
—
—
9 J x 17 H2
9 J x 17 H2
8 J x 17 AH2
8 J x 17 AH2
19
19
10
10
265/40 ZR 17**
245/40 ZR 18***
285/35 ZR 18***
—
—
—
9 J x 17 AH2
8 J x 18 AH2
19
13
9 1/2 J x 18 AH2 25
* Only permissible as mixed set with 235/45 R 17 93 W at front. Snow chains cannot be fitted.
** Only permissible as mixed set with 235/45 ZR 17 at front.
Snow chains cannot be fitted.
*** Only permissible as mixed set with 245/40 ZR 18 at front.
Snow chains cannot be fitted.
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Technical modifications
Any BMW Service point can provide you with information as to the practical value of an intended modification and whether it is legally permissible and approved by the manufacturer.
Enquiries should be accompanied by the vehicle identification number and, if relevant, the engine number.
Light-emitting diodes (LED)
Some of the controls, displays and other interior equipment of your car includes light-emitting diodes behind suitable covers as a light source.
These LEDs resemble conventional lasers and are classified by law as
Class 1 light-emitting diodes.
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Do not remove the cover or expose the eyes directly to the unfiltered light source for several hours at a time, as this could cause irritation to the iris.
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Online Edition for Part-No. 01 41 9 790 191 - © 12/98 BMW AG

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