Brake System Indicator Circuit Troubleshooting

Brake system indicator does not come on


1.With the parking brake applied, turn the ignition switch ON (II), and watch the brake system indicator.

Does the brake system indicator come on?


YES - Go to 3.


NO - Go to 2.


2.Turn the ignition switch OFF then ON (II) again.

Does the ABS indicator come on for several seconds?


YES - Replace the  gauge control module.n


NO - Repair open in the indicator power source circuit, If necessary, substitute a known-good gauge assembly, and recheck.n


3.Turn the ignition switch OFF.

4.Release the parking brake.

5.Turn the ignition switch ON (II).

Does the brake system indicator come on for several seconds?


YES - Go to 6.


NO - Check for loose terminals in the gauge control module connectors. If necessary, substitute a known-good gauge control module, and recheck.n


6.Apply the parking brake.

Does the brake system indicator come on?


YES - The system is OK at this time.n


NO - Go to 7.


7.Turn the ignition switch OFF.

8.Disconnect the parking brake switch connector.

9.Turn the ignition switch ON (II).

10.Measure the voltage between the parking brake switch connector terminal and body ground.

Is there battery voltage?


YES - Replace the parking brake switch.n


NO - Go to 11.


11.Turn the ignition switch OFF.

12.Remove the gauge control module.

13.Connect gauge control module connector B (30P) terminal No. 13 and body ground with a jumper wire.

14.Turn the ignition switch ON (II).

Does the brake system indicator come on and stay on?


YES - Repair open in the wire between the gauge control module, and the parking brake switch.n


NO - Replace the gauge control module.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 - Check the brake system indicator circuit;

  • Short to body ground between the gauge control module and the parking brake switch.n
  • Short to body ground between the gauge control module and the brake fluid level switch.n
  •  Parking brake switch stuck ON.n
  •  Brake fluid level switch stuck ON.n
  • Faulty  gauge control module.n