Diesel Data: Automotive Repair

Brake System Indicator Does Not GO OFF

Brake system indicator does not go off, and no DTCs are stored
1. Turn the ignition switch ON (II).
2. Release the parking brake.
Does the brake system indicator go off after several seconds?
YES - The system is OK at this time.
NO - Go to step 3.
3. Check the brake fluid level.
Is the level OK?
YES - Go to step 4.
NO - inspect the brake system for fluid leaks.
4. Check the ABS indicator.
Does the ABS indicator stay on?
YES - Read the ABS DTC, and do the applicable troubleshooting for the DTC.
NO - Go to step 5.
5. Turn the ignition switch OFF.
6. Disconnect the ABS modulator-control unit 25P connector.
7. Turn the ignition switch ON (II), and check the brake system indicator.
Does the brake system indicator go off?
YES - Replace the ABS modulator-control unit.
NO - Go to step 8.
8. Turn the ignition switch OFF.
9. Remove the gauge control module.
10. Disconnect the gauge control module connector (30P) ('03-05 models), (36P) ('06-07 models).
11. Check for continuity between the ABS modulator-control unit 25P connector terminal No. 21 and body ground.





Is there continuity?
YES - Repair short to body ground in the wire between the gauge control module and the ABS modulator-control unit.
NO - Check for a short to body ground in the brake system indicator circuit.