The brake warning indicator illuminates when ground is applied to the brake warning indicator control circuit.
The numbers below refer to the step numbers on the diagnostic table.
Ground is applied to the ABS pressure differential sensor signal circuit if the scan tool displays On.
This step tests for a shorted brake pressure differential switch.
This step tests if the EBCM is applying ground to the brake warning indicator.
This step tests for a shorted park brake warning lamp switch.
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: Brake Warning System Schematics | |||
1 | Did you review the Brake Warning System Description and Operation and perform the necessary inspections? | Go to Step 2 | |
2 |
Does the brake warning indicator illuminate for 3 seconds and then turn OFF? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the scan tool display DTC C0286 AND any other ABS disabling DTC? | Go to Diagnostic Trouble Code (DTC) List in Antilock Brake System | Go to Step 4 |
Does the scan tool display On? | Go to Step 5 | Go to Step 8 | |
Disconnect the brake pressure differential switch harness connector. Refer to Combination Valve Replacement . Does the brake warning indicator turn OFF? | Go to Step 14 | Go to Step 6 | |
Does the brake warning indicator turn OFF? | Go to Step 11 | Go to Step 7 | |
7 | Repair the short to ground in the ABS pressure differential sensor signal circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 15 | -- |
Disconnect the park brake warning lamp switch harness connector. Refer to Parking Brake Indicator Switch Replacement in Park Brake. Does the brake warning indicator turn OFF? | Go to Step 13 | Go to Step 9 | |
9 |
Does the test lamp remain illuminated? | Go to Step 10 | Go to Step 12 |
10 | Repair the short to ground in the brake warning indicator control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 15 | -- |
11 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement in Antilock Brake System. Important: Use the scan tool in order to perform the Tire Size Calibration procedure. Did you complete the replacement? | Go to Step 15 | -- |
12 | Replace the instrument panel cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console. Did you complete the replacement? | Go to Step 15 | -- |
13 | Replace the park brake warning lamp switch. Refer to Parking Brake Indicator Switch Replacement in Park Brake. Did you complete the replacement? | Go to Step 15 | -- |
14 | Replace the brake pressure differential switch. Refer to Combination Valve Replacement . Did you complete the replacement? | Go to Step 15 | -- |
15 |
Does the brake warning indicator illuminate for 3 seconds and then turn OFF? | System OK | Go to Step 3 |
The brake warning indicator illuminates when ground is applied to the brake warning indicator control circuit.
The numbers below refer to the step numbers on the diagnostic table.
Ground is applied to the ABS pressure differential sensor signal circuit if the scan tool displays On.
This step tests for a shorted brake pressure differential switch.
This step tests if the EBCM is applying ground to the brake warning indicator.
This step tests for a shorted park brake warning lamp switch.
The harness connector of the DRL control module contains 2 separate park brake switch signal circuits.
This step tests the brake warning indicator control circuit for a short to ground by substituting the IPC and the brake warning indicator lamp with a test lamp.
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: Brake Warning System Schematics | |||
1 | Did you review the Brake Warning System Description and Operation and perform the necessary inspections? | Go to Step 2 | |
2 |
Does the brake warning indicator illuminate for 3 seconds and then turn OFF? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the scan tool display DTC C0286 AND any other ABS disabling DTC? | Go to Diagnostic Trouble Code (DTC) List in Antilock Brake System | Go to Step 4 |
Does the scan tool display On? | Go to Step 5 | Go to Step 8 | |
Disconnect the brake pressure differential switch harness connector. Refer to Combination Valve Replacement . Does the brake warning indicator turn OFF? | Go to Step 20 | Go to Step 6 | |
Does the brake warning indicator turn OFF? | Go to Step 16 | Go to Step 7 | |
7 | Repair the short to ground in the ABS pressure differential sensor signal circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 21 | -- |
Disconnect the park brake warning lamp switch harness connector. Refer to Parking Brake Indicator Switch Replacement in Park Brake. Does the brake warning indicator turn OFF? | Go to Step 18 | Go to Step 9 | |
9 |
Does the brake warning indicator turn OFF? | Go to Step 10 | Go to Step 14 |
10 |
Is the park brake switch signal circuit shorted to ground within the ignition switch? | Go to Step 19 | Go to Step 11 |
Did you find and correct the condition? | Go to Step 21 | Go to Step 12 | |
12 | Test the brake warning indicator control circuit for a short to ground between the DRL control module circuit board and the underhood fuse block. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 13 |
13 | Replace the DRL control module circuit board. Refer to Daytime Running Lights (DRL) Control Module Replacement in Lighting Systems. Did you complete the replacement? | Go to Step 21 | -- |
Does the test lamp remain illuminated? | Go to Step 15 | Go to Step 17 | |
15 | Repair the short to ground in the brake warning indicator control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 21 | -- |
16 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement in Antilock Brake System. Important: Use the scan tool in order to perform the Tire Size Calibration procedure. Did you complete the replacement? | Go to Step 21 | -- |
17 | Replace the instrument panel cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console. Did you complete the replacement? | Go to Step 21 | -- |
18 | Replace the park brake warning lamp switch. Refer to Parking Brake Indicator Switch Replacement in Park Brake. Did you complete the replacement? | Go to Step 21 | -- |
19 | Replace the ignition switch. Refer to Ignition Switch Replacement - On Vehicle in Steering Wheel and Column. Did you complete the replacement? | Go to Step 21 | -- |
20 | Replace the brake pressure differential switch. Refer to Combination Valve Replacement . Did you complete the replacement? | Go to Step 21 | -- |
21 |
Does the brake warning indicator illuminate for 3 seconds and then turn OFF? | System OK | Go to Step 3 |