Brake System Indicator Circuit Troubleshooting - Without VSA

Brake system indicator does not come on


1.Disconnect the negative cable from the battery.

2.Disconnect the multiplex control unit 13P connector and the ABS control unit 26P connector.

3.Check for continuity between the ABS control unit 26P connector terminal No. 10 and body ground.

 

Is there continuity?


YES - Repair short to body ground in the wire between the multiplex control unit and the ABS control unit.n


NO - Go to multiplex control system troubleshooting.n

Brake system indicator does not go off, and no DTCs are stored


1.Start the engine.

2.Release the parking brake.

Does the brake system indicator go off?


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 applicable troubleshooting for the DTC.n


NO - Go to 5.


5.Turn the ignition switch OFF.

6.Disconnect the negative cable from the battery.

7.Disconnect the ABS control unit 26P connector.

8.Reconnect the battery cable.

9.Connect the ABS control unit 26P connector terminal No. 10 and body ground with a jumper wire.

 

10.Start the engine.

11.Check the brake system indicator.

Does the brake system indicator go off?


YES - Replace the  ABS modulator-control unit.n


NO - Go to 12.


12.Turn the ignition switch OFF.

13.Connect the multiplex control unit 13P connector terminal No. 1 and body ground with a jumper wire.

 

14.Start the engine.

15.Check the brake system indicator.

Does the brake system indicator go off?


YES - Repair open in the wire between the multiplex control unit and the ABS control unit.n


NO - Go to multiplex control system troubleshooting.n