Brake System Indicator Circuit Troubleshooting

Brake System Indicator Circuit Troubleshooting
1. Release the parking brake.
2. 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 turns off. Repair open in the wire between terminal No. 3 of the ALT 4P connector and terminal B8 of the gauge assembly.
3. Turn the ignition switch OFF then ON (II) again.
Does the ABS indicator come on?
YES - Go to step 4.
NO - Repair open in the indicator power source circuit.
- Blown BACK-UP LIGHT (10 A) fuse.
- Open in the wire between the BACK-UP LIGHT (10 A) fuse and gauge assembly.
- Open circuit inside the fuse box.
4. Check the brake system indicator bulb in gauge assembly.
Is the bulb OK?
YES - Repair open in the brake system indicator circuit.
NO - Replace the brake system indicator bulb.
5. Start the engine.
Does the brake system indicator turn off?
YES - System is OK at this time.
NO - Go to step 6.
6. Check the ABS indicator.
Does the ABS indicator come on?
YES - Read the ABS DTC's, and do the applicable troubleshooting.
NO - Go to step 7.
7. Turn the ignition switch OFF.
8. Disconnect the ABS/TCS control unit connector B (16P).
9. Start the engine, and cheek the brake system indicator.
Does the brake system indicator turn off?
YES - Replace the ABS/TCS control unit.
NO - Check the brake system indicator circuit (short to body ground between terminal No. 3 of the ALT 4P connector and terminal Be of the gauge assembly), parking brake switch (stuck ON) and brake fluid level switch (stuck ON).