Symptom Chart

Condition	Possible Sources	Action
No communication with the ABS module	Wiring, terminals or connectors ABS module	REFER to MODULE COMMUNICATIONS NETWORK article to diagnose the no communication problem.
The red brake warning indicator is always/never on	Wiring, terminals or connectors Instrument cluster Brake fluid level sensor ABS module	REFER to Diagnosis and Testing in INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES article.
The yellow ABS warning indicator is always/never on	Wiring, terminals or connectors Instrument cluster ABS module	RETRIEVE and RECORD any ABS module DTCs. If DTCs are present, go to ABS MODULE DTC TABLE . If no DTCs are present, REFER to Diagnosis and Testing in INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES article.
Spongy brake pedal with no warning indicator	Air in brake hydraulic system	REFER to BRAKE SYSTEM - GENERAL INFORMATION article.
The traction control/roll stability control (RSC) indicator is always/never on	Wiring, terminals or connectors Traction control switch Instrument cluster ABS module	REFER to Diagnosis and Testing in INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES article.
The traction control/RSC system cannot be disabled	Wiring, terminals or connectors Stability traction control switch ABS module	Go to Pinpoint Test J .