2010-Up Prius HB Navigation speedlock override

2010-Up Prius HB Navigation speedlock override
2010-Up Prius HB Navigation speedlock override installation guide.
Dash disassembly
Dash disassembly are the same for 2010, 2011, and 2012 Prius Hatch Back. The following is a 2010 Prius III.
Remove the lower glove box.
Remove the cigarette lighter bezel in the lower bridge
2010 Prius III Shown
Stick your thumb into the cigarette lighter and pull gently. You won’t get shocked. I promise. Carefully pry the corner of
the bezel and work your way around
2010 Prius III Shown
There are no screws holding the bezel. It’s all pressure tabs.
If you want to install the switch in the blank spots in the knee bolster, remove the knee bolster.
Radio removal is as followed.
2010 Prius III Shown
To remove the radio, first by prying up the shifter bezel on the left lower corner. Then work your way around the rest of
the bezel. Disconnect the plugs for the Park and the drive mode selector and remove the bezel.
WARNING: Do not power up the Prius with these 2 plugs unplugged. You will get a Hybrid system warning on the
dash.
2010 Prius III Shown
Open the cup holder and pull the cup holder bezel straight up. Then work your way toward the top of the bezel. There are
no screws holding the bezel down. Open the top glove box may help unclipping the bezel.
2010 Prius III Shown
Remove the radio bezel by pulling the right side of the bezel outward first then work your way around the rest of the bezel.
Disconnect the clock/Km/h plug and remove the bezel.
2010 Prius III Shown
Once the radio bezel is removed, unclip the power button bezel but do not disconnect it.
2010 Prius III Shown
Remove the 4 10MM bolts securing the radio. Place a towel under the radio covering the AC control and the shift knob to
prevent scratching and damaging to the AC control and shift knob. Pull the radio out of its cavity and set the radio on the
towel.
For 2010-2011
Once the radio is removed, locate the gray plug
Unwrap the plastic wire cover and locate the Vehicle Speed Sense wire (violet wire) on pin 3. It should be the middle pin.
You have to sever the wire. Leave enough slack so you can do future repairs to the wire if necessary.
Strip both ends of the wire.
Crimp the quick disconnects on both ends of the wire. Female connector goes to the head unit side and the male connector
goes to the harness side or vice versa. The quick disconnects are used for future removal of the bypass so you can
reconnect the VSS wire together.
Connect the supplied VSS harness’s solid color wire (short wire) to the head unit and the striped wire (long wire) to the
harness side. The solid color wire should be on the pointy end of the plug and the striped wire should be on the square end
of the plug. Do not reverse the connection (solid wire toward the harness and stripe wire toward the head unit. Possible
damage to the vehicle speed ECU may occur)
Rewrap the plastic wire cover and tape both ends and the middle, leaving the VSS plug exposed. You can plug in the gray
plug back into the radio.
Route the VSS extension harness from the radio to the lower center console and zip tie it to the main radio harness.
Connect the VSS harness to the extension harness. Reconnect the gray plug back to the head unit.
For 2012
2012 6.1” Display Audio head unit shown
2012 6.1” Display Audio head unit shown
Once you gain access to the head unit harness, the Vehicle Speed Sense wire is pin #17 located in the white 28pin plug .
For V#V, the parking brake wire is pin #6 located in the white 16 pin plug.
The Vehicle Speed Sense wire is pin #17 located in the white 28pin plug L130
For V#V, the parking brake wire is pin #6 located in the white 16 pin plug L111
The override’s VSS wires and parking brake wires connections are
For V# and V#V
Violet (Short Wire) to violet speed sense wire going into the head unit
Violet/black stripe (Long Wire) to violet speed sense wire going toward the harness
For V#V only
Red (Short Wire) to red parking brake wire going into the head unit
Pink (Long Wire) to red parking brake wire going toward harness
If you’re installing a V#V override, you have to place the override relay and timer in the lower cigarette lighter
cavity and route the VSS harness up toward the head unit cavity.
2012 6.1” Display Audio head unit shown
2012 6.1” Display Audio head unit shown
2012 6.1” Display Audio head unit shown
Unwrap the plastic wire cover and locate the Vehicle Speed Sense wire (violet wire) on pin 17.
2012 6.1” Display Audio head unit shown
You have to sever the wire. Leave enough slack so you can do future repairs to the wire if necessary. Strip both ends of the
wire. Crimp the quick disconnects on both ends of the wire. Female connector goes to the head unit side and the male
connector goes to the harness side or vice versa. The quick disconnects are used for future removal of the bypass so you
can reconnect the VSS wire together.
2010-2011 Shown, 2012 connection looks similar
Violet Vehicle Speed Sense Wire, Red Parking Brake Wire.
2010-2011 Shown, 2012 looks similar
Connect the supplied VSS harness’s solid color wire (short wire) to the head unit and the striped wire (long wire) to the
harness side. The solid color wire should be on the pointy end of the plug and the striped wire should be on the square end
of the plug. Do not reverse the connection (solid wire toward the harness and stripe wire toward the head unit. Possible
damage to the vehicle speed ECU may occur)
2010-2011 Shown, 2012 looks similar
Rewrap the plastic wire cover and tape both ends and the middle, leaving the VSS plug exposed. You can plug in the gray
plug back into the radio.
2010-2011 Shown, 2012 looks similar
Connect the VSS harness to the extension harness then route the VSS extension harness from the radio to the lower center
console and zip tie it to the main radio harness. Reconnect all the plugs to the headunit and place the HU back in the dash.
The VSS extension harness’s wire colors for V# could be any of the following but they all serve the same purpose.
White – white/black stripe
Gray – gray/black stripe
Green – green/black stripe
The V#V’s extension harness is not detachable.
2010-2011 Shown, 2012 looks similar
Route the VSS extension harness to the lower center console. Removing the lower glove box makes the job easier.
2010-2011 Shown, 2012 looks similar
Route the switch extension harness through the lower center console.
For III/Three owners who want to install the switch in the blank panel next to the cigarette lighter, you can skip this step.
For IV/Four owners who want to install the switch in the blank panel next to the knee airbag, route the switch extension
harness toward that panel.
For V/Five owners or III and IV owners who want to install the switch in the knee bolster panel, route the switch extension
harness to the knee bolster panel.
2010-2011 Shown, 2012 looks similar
There should be 2 harnesses in the lower center console, the VSS extension harness and the switch extension harness.
2010-2011 Shown, 2012 looks similar
Locate the cigarette lighter harness. There should a solid black wire and a white – black stripe wire.
2010-2011 Shown, 2012 looks similar
Unwrap the electrical tape to gain access to the wires.
T-Tap both wires and connect the red wire on the power harness to the black wire on the cigarette lighter wire. Connect the
black wire on the power harness to the white-white/black stripe wire on the cigarette lighter wire.
Connect all the harnesses to the bypass relay.
2010 Prius IV Solar PKG shown. 2012 looks similar.
Route the switch extension harness though a blank plug.
2010 Prius III Nav PKG with Enginer PHEV conversion shown 2012 look similar.
Connect the switch to the switch harness and snap the switch panel into the blank panel.
Testing the bypass before driving.
Turn the ACC-ON on. Enter the service menu by holding down the INFO (2010-2011) SETUP (2012) button and turn the
parking lights on and off 4 times. From there, click on the Function Check/Settings then Vehicle Signal. The vehicle speed
should be less than 5km/h.
Road testing
WARNING: Make sure the 2 plugs on the shifter bezel Park and drive mode selector are plugged in before
powering up the Prius. You will get a Hybrid system warning on the dash if they are not plugged in.
Before reassembling the dash, road test drive the bypass to ensure its functionality. The bypass must function for at least 2
minutes. Once that time has passed, turn off the bypass then turn it back on. The bypass must continue to work
immediately afterwards.
In this road test, the actual vehicle speed is 41MPH but the head unit is registering 2km/h. Because the head unit registered
a speed of less than 8km/h, all the grayed out buttons are now activated for you to use.
Trouble shooting
Bypass does not work.
Check the vehicle speed in the service menu. It must be below 8km/h. If it’s more than 8km/h the bypass will not
work. If you have an oscilloscope, you can hook up the bypass output to the scope. It should be less than 4.5hz.
Unplug the VSS harness from the override relay and plug in the VSS bypass loop. Cycle the power off then on. The
speed should match the dashboard. Reconnect the VSS harness and test the bypass again. Sometimes the nav unit
may register false speed due to faulty GPS signal. Reset the head unit will should work.
Reverse camera does not work after installation.
Recheck the gray plug (2010-2011) white 28pin plug (2012) and make sure it is plugged in.
Bypass works for about a minute then stop working.
Recheck the VSS connection at the gray plug(2010-2011) white 28pin plug (2012). It could be reversed (solid wire
connected to the harness toward car side, stripe wire connected to the head unit)
The GPS is showing warp speed and the service menu shows the speed 3 to 20 times faster than actual speed.
Reset the radio or cycle the power off and on. The speed should match the dashboard
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