Symptom Chart

Condition	Possible Sources	Action
No communication with the anti-lock brake system (ABS) module	Circuitry ABS module	REFER to MODULE COMMUNICATIONS NETWORK article to diagnose the no communication problem.
The red brake warning indicator stays on when the ignition switch is in the RUN position	Circuitry Parking brake Brake fluid level sensor Instrument cluster Anti-lock brake system (ABS) module	REFER to INSTRUMENT CLUSTER article.
The yellow anti-lock brake system (ABS) warning indicator does not self-check	Circuitry Instrument cluster ABS module	REFER to INSTRUMENT CLUSTER article.
Spongy brake pedal with no warning indicator	Air in brake hydraulic system Base brakes	REFER to BRAKE SYSTEM - GENERAL INFORMATION article.