Brake System Indicator Circuit Troubleshooting

Brake System Indicator Circuit Troubleshooting
Brake system indicator does not come
1. Turn the ignition switch ON (II), and watch the brake system indicator.
Does the brake system indicator come on for several seconds?
YES - The system is OK at this time. Refer to intermittent failures.
NO - Go to step 2.

2. Do the gauge control module self-diagnosis function procedure.
Is the gauge control module OK?
YES - Go to step 3.
NO - Replace gauge control module.

3. Turn the ignition switch OFF.
4. Substitute a known-good VSA modulator-control unit.
5. Turn the ignition switch ON (II).
Does the brake system indicator come on?
YES - Replace the VSA modulator-control unit.
NO - Check for loose terminals in the gauge control module connectors. If connections are good, replace the gauge control module.