Brake System Indicator Circuit Troubleshooting

Brake system indicator does not come on


1.Do the gauge assembly self-diagnosis function.

Is gauge assembly OK?


YES - Go to 2.


NO - Replace gauge assembly.n


2.Turn the ignition switch OFF.

3.Disconnect the VSA control unit 46P connector.

4.Connect the VSA control unit 46P connector terminal No. 16 and body ground with a jumper wire.

 

5.Turn the ignition switch ON (II).

Doest the brake system indicator come on?


YES - Check for loose or poor connections in the VSA control unit 46P connector. If connections are good, replace the VSA modulator-control unit.n


NO - Repair open in the wire between gauge assembly and VSA modulator-control unit.n

Brake system indicator does not go off


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.n


NO - Go to 3.


3.Check the brake fluid level.

Is the level OK?


YES - Go to 4.


NO - Refill the brake fluid, and recheck.n


4.Check the ABS indicator.

Does the ABS indicator stay on?


YES - Read the ABS DTC, and do the applicable troubleshooting for the DTC.n


NO - Go to 5.


5.Turn the ignition switch OFF.

6.Disconnect the VSA control unit 46P connector.

7.Turn the ignition switch ON (II), and check the brake system indicator.

Does the brake system indicator go off?


YES - Replace the VSA modulator-control unit.n


NO - Go to 8.

8.Turn the ignition switch OFF.

9.Remove the gauge assembly.

10.Disconnect gauge assembly connector C (40P).

11.Check for continuity between the VSA control unit 46P connector terminal No. 16 and body ground.

 

Is there continuity?


YES - Repair short to body ground in the wire between the gauge control module and the VSA modulator-control unit.n


NO - Check for a short to body ground in the brake system indicator circuit.n