## Brake System Indicator Circuit Troubleshooting

### Brake system indicator does not come on

1. | Turn the ignition switch ON (II). Does the ABS indicator come on? YES - Go to 2. NO - Repair open in the indicator power source circuit:n Blown No. 3 (7.5 A) fuse in the under-dash fuse/relay box. Open in the wire between the No. 3 (7.5 A) fuse and the gauge assembly. Open circuit inside the fuse box.

2. | Turn the ignition switch OFF.

3. | Disconnect the negative cable from the battery.

4. | Disconnect the ABS control unit 25P connector.

5. | Reconnect the battery cable.

6. | Connect ABS control unit 25P connector terminal No. 16 and body ground with a jumper wire.

7. | Turn the ignitions switch ON (II). Does the brake system indicator come on? YES - Check for loose terminals in the ABS control unit 25P connector. If necessary substitute a known-good ABS modulator-control unit, and recheck.n NO - Go to 8.

8. | Apply parking brake. Does the brake system indicator come on? YES - The system is OK at this time.n NO - Go to 9.

9. | Check the parking brake switch. Is the switch OK? YES - Go to 10. NO - Replace the parking brake switch.n

10. | Remove the gauge assembly.

11. | Connect the gauge assembly connector C (30P) terminal No. 7 and body ground with a jumper.

12. | Turn the ignition switch ON (II). Does the brake system indicator come on? YES - Repair open in the wire between the parking brake switch and the gauge assembly.n NO - Replace the gauge assembly.n

### Brake system indicator does not go off

1. | Release the parking brake. Does the brake system indicator go off? YES - The system is OK at this time.n NO - Go to 2.

2. | Check the parking brake switch. Is the switch OK? YES - Go to 3. NO - Refill the brake fluid level switch.n

3. | Check the brake fluid level. Is the level OK? YES - Go to 4. NO - Replace the parking brake switch.n

4. | Check the brake fluid level switch. Is the switch OK? YES - Go to 5. NO - Replace the brake fluid level switch.n

5. | Turn the ignition switch OFF.

6. | Disconnect the negative cable from the battery.

7. | Disconnect the ABS control unit 25P connector.

8. | Reconnect the battery cable.

9. | Turn the ignition switch ON (II). Does the brake system indicator go off? YES - Replace the ABS modulator-control unit.n NO - Go to 10.

10. | Turn the ignition switch OFF.

11. | Turn the ignition switch OFF.

12. | Disconnect the negative cable from the battery.

13. | Remove the gauge assembly.

14. | Disconnect the gauge assembly connector C (30P).

15. | Check for continuity between the gauge assembly connector C (30P) terminals No. 6 and body ground. Is there continuity? YES - Repair short to body ground in the wire between the gauge assembly and the ABS modulator-control unit.n NO - Repair short to body ground in the wire between the brake system indicator and the parking brake switch or between the brake system indicator and the brake fluid level switch.n