Brake System Indicator Circuit Troubleshooting

Release the parking brake.
Turn the ignition switch ON (II), and check the brake system indicator for the following conditions:
- Brake system indicator does not come on at all, go to step 3.
- Brake system indicator stays on all the time, go to step 5
- Brake system indicator comes on for 2 seconds, then goes off. Repair open in the wire between terminal No. 3 of the ALT 4P connector and terminal B8 of the gauge assembly.
Turn the ignition switch OFF then ON (II) again.
Does the ABS indicator come on ?
1. YES - Go to step 4.
2. NO - Repair open in the indicator power source circuit.
- Blown BACKUP LIGHT (10A) fuse.
- Open in the wire between the BACKUP LIGHT (10A) fuse and the gauge assembly.
- Open circuit inside the fuse box.
Check the brake system indicator bulb in the gauge assembly.
Is the bulb OK?
1. YES - Repair open in the brake system indicator circuit.
2. NO - Replace the brake system indicator bulb.
Start the engine.
Does the brake system indicator go off?
1. YES - System is OK at this time.
2. NO - Go to step 6.
Check the ABS indicator.
Does the ABS indicator come on?
1. YES - Read the ABS DTC's (see How to Retrieve DTCs ), and do the applicable troubleshooting.
2. NO - Go to step 7.
Turn the ignition switch OFF.
Disconnect the ABS/TCS control unit connector B(16P).
Start the engine, and check the brake system indicator.
Does the brake system indicator go off?
1. YES - Replace the ABS/TCS control unit.
2. NO - Check the brake system indicator circuit (short to body ground between terminal No. 3 of the ALT 4P connector and terminal B8 of the gauge assembly), parking brake switch (stuck ON) and brake fluid level switch (stuck ON).