Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the ABS module	Fuse(s) Wiring, terminals or connectors ABS module	REFER to MODULE COMMUNICATIONS NETWORK article to diagnose the no communication problem.
The yellow ABS warning indicator is never on	Wiring, terminals or connectors Instrument Cluster (IC)	REFER to Diagnosis and Testing in INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES article.
The stability/traction control indicator is never on	Stability/traction control system PCM ABS module IC	REFER to Diagnosis and Testing in INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES article.
Only the red brake warning indicator is always/never on	Wiring, terminals or connectors Parking brake switch Brake fluid level switch Smart Junction Box (SJB) IC	REFER to Diagnosis and Testing in INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES article.
The yellow ABS warning indicator is always on	DTCs in the ABS module	RETRIEVE and RECORD any ABS module DTCs. GO to the ABS MODULE DTC CHART in this service information.
The yellow ABS warning indicator is always on	ABS module IC	If there are no DTCs present in the ABS module, REFER to Diagnosis and Testing in INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES article.
The stability/traction control indicator is always on	DTCs in the ABS module	RETRIEVE and RECORD any ABS module DTCs. GO to the ABS MODULE DTC CHART in this service information.
The stability/traction control indicator is always on	Stability/traction control system PCM IC Restraints Control Module (RCM)	If there are no DTCs present in the ABS module, REFER to Diagnosis and Testing in INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES article.
Both the yellow ABS warning indicator and the stability/traction control indicator are always on	DTCs in the ABS module	RETRIEVE and RECORD any ABS module DTCs. GO to the ABS MODULE DTC CHART .
	Stability/traction control system PCM ABS module IC RCM	If there are no DTCs present in the ABS module, REFER to Diagnosis and Testing in INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES article.
All 3 indicators (red brake, yellow ABS and stability/traction control) are always on	DTCs in the ABS module	RETRIEVE and RECORD any ABS module DTCs. GO to the ABS MODULE DTC CHART .
	Wiring, terminals or connectors Parking brake switch Brake fluid level switch Stability/traction control system SJB PCM ABS module IC RCM	If there are no DTCs present in the ABS module, REFER to Diagnosis and Testing in INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES article.
The red brake warning indicator always/never on	Brake fluid level low and/or brake fluid leaks Brake fluid level switch Parking brake switch Wiring, terminals or connectors SJB	REFER to Diagnosis and Testing in INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES article.
Unintended ABS activation at low speeds or near the end of stopping the vehicle with no DTCs present	Incorrect or worn tires Underinflated tire(s) Suspension components Missing, damaged or misaligned wheel speed sensor tone rings	INSPECT the wheels and tires, front and rear suspension and the wheel speed sensor tone rings. REPAIR or INSTALL new as necessary.
Spongy brake pedal with no warning indicator	Air in the brake hydraulic system	BLEED the brake system and the Hydraulic Control Unit (HCU). REFER to Brake System Bleeding in BRAKE SYSTEM - GENERAL INFORMATION article.
Spongy brake pedal with no warning indicator	Damaged or incorrectly installed brake components	INSPECT the brake pedal, brake booster and master cylinder for correct installation. REFER to HYDRAULIC BRAKE SYSTEM ACTUATION article for the brake pedal and master cylinder. REFER to POWER BRAKE ACTUATION -- BRAKE BOOSTER article for the brake booster. CORRECT the installation or INSTALL new as necessary. TEST the system for normal operation.
Poor vehicle tracking during anti-lock function	Air in the hydraulic brake system HCU	GO to PINPOINT TEST L .
Poor vehicle tracking during anti-lock function	Base brake system	REFER to BRAKE SYSTEM - GENERAL INFORMATION article.
The stability traction control system is inoperative	Wiring, terminals or connectors Stability traction control switch ABS module IC RCM	GO to PINPOINT TEST G .
The stability traction control system cannot be disabled	MyKey™-restricted key in use with AdvanceTrac® always-on feature configured to "on" Wiring, terminals or connectors Stability traction control switch IC RCM	GO to PINPOINT TEST G .