Brake System Indicator Circuit Troubleshooting

Brake System Indicator Circuit Troubleshooting
Brake system indicator does not come on at bulb check and/or with parking brake applied
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.
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 ABS/TCS modulator control unit.
5. Turn the ignition switch ON (II).
Does the brake system indicator come on?
YES - Replace the ABS/TCS modulator-control unit:
NO - Check for loose terminals in the gauge control module connectors. If connections are good, replace the gauge control module.