C107C

C107C-BRAKE PEDAL SWITCH 1/2 STUCK (EBC125)





For a complete wiring diagram Refer to Diagram/Electrical. Electrical Diagrams

- When Monitored:

With system voltage greater than 9.0 volts (+/- 10%) and vehicle speed present.

- Set Condition:

Continuous brake applied signal starting no later than 2.2 seconds after ignition on and remaining until 10 seconds after sensed vehicle speed reaches 37.5 m.p.h.





Diagnostic Test

1. VERIFY THE CONDITION

NOTE: Driving with the brake applied may set this code.

Turn the ignition off.

Ensure all accessories are turned off and the battery is fully charged.

Turn the ignition on.

With the scan tool, monitor the status of the brake switch while pressing and releasing the brake pedal several times.

With the scan tool, erase DTCs.

CAUTION: Determine that braking capability is available before road testing the vehicle.

Road test the vehicle for at least 5 minutes over 40 MPH. Perform several anti-lock braking stops.

With the scan tool, read DTCs.

Does the original DTC reset and/or does intermittent brake switch operation occur?

Yes

- Go To 2

No

- The condition necessary to set this DTC is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors relative to this circuit.
- Perform ABS Verification ABS Verification Test

2. BRAKE LAMP SWITCH





Turn ignition off.

Disconnect the Brake Lamp Switch harness connector.

Turn ignition on.

With the scan tool, monitor the brake switch status.

Connect and disconnect a jumper wire between the (Z429) Ground circuit and the (B29) Brake Switch Signal circuit.

Does the scan tool display correctly with the jumper wire connected and disconnected?

Yes

- Replace the Brake Lamp Switch.
- Perform ABS Verification ABS Verification Test

No

- Go To 3

3. (B29) BRAKE SWITCH SIGNAL CIRCUIT SHORT TO VOLTAGE





Turn the ignition off.

Disconnect the Anti-lock Brake Module harness connector.

Turn the ignition on.

Measure the voltage of the (B29) Brake Switch Signal circuit.

Is there any voltage present?

Yes

- Repair the (B29) Brake Switch Signal circuit for a short to voltage.
- Perform ABS Verification ABS Verification Test

No

- Go To 4

4. (B29) BRAKE SWITCH SIGNAL CIRCUIT OPEN





Turn the ignition off.

Measure the resistance of the (B29) Brake Switch Signal circuit between the Anti-lock Brake Module harness connector and the brake switch harness connector.

Is the resistance above 5.0 ohms?

Yes

- Repair the open (B29) Brake Switch Signal circuit.
- Perform ABS Verification ABS Verification Test

No

- Go To 5

5. (Z429) GROUND CIRCUIT OPEN





Using a 12-volt test light connected to 12 volts, check the (Z429) Ground circuit at the brake switch harness connector.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

Is the test light illuminated and bright?

Yes

- Replace the Anti-lock Brake Module. Refer to the symptom *Replacing the Anti-lock Brake Module.
- Perform ABS Verification ABS Verification Test

No

- Repair the (Z429) Ground circuit for an open circuit or high resistance.
- Perform ABS Verification ABS Verification Test