C1215-29

C1215-29-BRAKE LIGHT SWITCH - INVALID SIGNAL

For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
With ignition on, but not if supply voltage faults are detected.

- Set Condition:
If the Anti-Lock Brake System (ABS) Module detects that the Brake Lamp Switch is sending an internal failure message.





NOTE: Diagnose and repair any Powertrain Control Module (PCM), VIN or Communication DTCs before continuing with this diagnostic procedure.

1. VERIFY THE DTC IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, read and record the ABS DTCs.
3. With the scan tool, read and record Environmental Data (EV Data).
4. With the scan tool, erase the ABS DTCs.
5. Cycle the ignition switch.

WARNING: Make sure brake capability is available before road testing.

6. Test drive the vehicle by turning the vehicle left or right in a curving manner at a velocity between 10 and 20 km/h (6 and 12 mph).
7. With the scan tool, read the ABS DTCs.

Is the DTC active at this time?

Yes

- Go To 2

No

- Perform the ABS INTERMITTENT CONDITION TEST. ABS Intermittent Condition Test.

2. CHECK THE STOP LAMP SWITCH INSTALLATION
1. Turn the ignition off.
2. Inspect the Stop lamp Switch to make sure it is properly installed.
3. Check all related connectors for broken, bent, pushed out, or corroded terminals.
4. Check the Stop lamp Switch to make sure it is returning to the proper position.

Were any problems found?

Yes

- Repair as necessary.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 3

3. STOP LAMP SWITCH
1. Replace the Stop Lamp Switch. Stop Lamp Switch - Removal.
2. Perform the ABS VERIFICATION TEST. ABS Verification Test.
3. With the scan tool, read the ABS DTCs.

Does the DTC remain active?

Yes

- Replace the Anti-Lock Brake System (ABS) Module. Anti-Lock Brake System Module - Removal.
- Perform ABS VERIFICATION TEST. ABS Verification Test.

No

- Test complete.