VSA DTC 68-12 (2016)
DTC 68-12 : Brake Pedal Position Switch Stuck ON
NOTE: Before you troubleshoot, review the general troubleshooting information - Refer to:
How to Troubleshoot the VSA System (2014 2015 2016)
| DTC Description | DTC | Freeze Frame |
|---|---|---|
| 68-12 Brake Pedal Position Switch Stuck ON |
DTCs (VSA)
- Problem verification
- 1. Turn the vehicle to the ON mode.
- 2. Clear the DTC with the HDS.
- 3. Turn the vehicle to the OFF (LOCK) mode.
- 4. Test-drive the vehicle at 9 mph (15 km/h) or more for 60 seconds or more under these condition:
- Accelerator pedal pressed
- Brake pedal released
NOTE: Drive the vehicle on the road, not on a lift.
- 5. Check for DTCs with the HDS.
DTC Description DTC Freeze Frame 68-12 Brake Pedal Position Switch Stuck ON Is DTC 68-12 indicated?
YES
The failure is duplicated. Go to step 2.
NO
Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting - Refer to:
How to Troubleshoot the VSA System (2014 2015 2016)
If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the Freeze data/on-board snapshot.
- Brake pedal height check
- 1. Check the brake pedal height.
Is the brake pedal height OK?
YES
Go to step 3.
NO
- Brake pedal position switch performance check 1
- 1. Check the parameter(s) below with the HDS while pressing the brake pedal.
Signal Current conditions Values Unit BRAKE SWITCH Does it indicate ON when the pedal is pressed, and OFF when the pedal is released?
YES
Go to step 9.
NO
Go to step 4.
- Brake pedal position switch performance check 2
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connector.
Brake pedal position switch 4P connector - 3. Check the parameter(s) below with the HDS.
Signal Current conditions Values Unit BRAKE SWITCH Does the indicator change from ON to OFF?
YES
Replace the brake pedal position switch .
NO
Go to step 5.
- Shorted wire check (STOP SW line to power) 1
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Short the SCS line with the HDS.
- 3. Disconnect the following connector.
PCM connector A (51P) - 4. Turn the vehicle to the ON mode.
- 5. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Brake pedal position switch 4P connector: disconnected PCM connector A (51P): disconnected Test point 1 PCM connector A (51P) No. 25 - Refer to:
PCM Connector for Inputs and Outputs (2014 2015) or
PCM Connector for Inputs and Outputs (2016) or
PCM Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 Body ground Is there 0. 1 V or more?
YES
Repair a short to power in the wire between the brake pedal position switch and the PCM.
YES
Go to step 6.
NO
The STOP SW wire is OK. Go to step 8.
- Shorted wire check (STOP SW line to power) 2
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Remove the brake light relay.
- 3. Turn the vehicle to the ON mode.
- 4. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Brake pedal position switch 4P connector: disconnected PCM connector A (51P): disconnected Brake light relay: removed Test point 1 PCM connector A (51P) No. 25 - Refer to:
PCM Connector for Inputs and Outputs (2014 2015) or
PCM Connector for Inputs and Outputs (2016) or
PCM Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 Body ground Is there 0. 1 V or more?
YES
Repair a short to power in the wire between the brake pedal position switch, the PCM, and the under-hood fuse/relay box.
NO
The STOP SW wire is OK. Go to step 7.
- Shorted wire check (BRAKE DIAG line to power)
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connector.
VSA modulator-control unit 38P connector - 3. Turn the vehicle to the ON mode.
- 4. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Brake pedal position switch 4P connector: disconnected PCM connector A (51P): disconnected Brake light relay: removed VSA modulator-control unit 38P connector: disconnected Test point 1 VSA modulator-control unit 38P connector No. 18 - Refer to:
VSA Modulator-Control Unit Connector for Inputs and Outputs (2014 2015), or
VSA Modulator-Control Unit Connector for Inputs and Outputs (2016), or
VSA Modulator-Control Unit Connector for Inputs and Outputs (2017 2018 2019 2020)Test point 2 Body ground Is there 0. 1 V or more?
YES
Repair a short to power in the wire between the under-hood fuse/relay box and the VSA modulator-control unit.
NO
Replace the brake light relay.
- PCM check (update or substitution)
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Reconnect the following connectors.
Brake pedal position switch 4P connector PCM connector A (51P) - 3. Update the PCM if it does not have the latest software,
or substitute a known-good PCM. Refer to:
PCM Removal and Installation (2016 2017 2018 2019 2020)
- 4. Turn the vehicle to the ON mode.
- 5. Clear the DTC with the HDS.
- 6. Turn the vehicle to the OFF (LOCK) mode.
- 7. Test-drive the vehicle at 9 mph (15 km/h) or more for 60 seconds or more under these condition:
- Accelerator pedal pressed
- Brake pedal released
NOTE: Drive the vehicle on the road, not on a lift.
- 8. Check for DTCs with the HDS.
DTC Description DTC Freeze Frame 68-12 Brake Pedal Position Switch Stuck ON Is DTC 68-12 indicated?
YES
Go to step 9.
NO
If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM - Refer to:
- VSA modulator-control unit check (update)
- 1. Update the VSA modulator-control unit if it does not have the latest software.
- 2. Turn the vehicle to the OFF (LOCK) mode.
- 3. Test-drive the vehicle at 9 mph (15 km/h) or more for 60 seconds or more under these condition:
- Accelerator pedal pressed
- Brake pedal released
NOTE: Drive the vehicle on the road, not on a lift.
- 4. Check for DTCs with the HDS.
DTC Description DTC Freeze Frame Is DTC 68-12 indicated?
YES
Check for loose terminals and poor connections in the VSA modulator-control unit 38P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit .
NO
Troubleshooting is complete.