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 red brake warning indicator and the yellow ABS warning indicator are always on	DTCs present in the ABS module	RETRIEVE and RECORD the DTCs. Go to the ABS Module DTC Table .
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 Smart junction box (SJB)	Refer to Diagnosis and Testing in INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES article.
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.
	Damaged or incorrectly installed brake components	INSPECT the brake pedal, brake booster and master cylinder for correct installation. REFER to HYDRAULIC BRAKE ACTUATION article for the brake pedal and master cylinder. REFER to POWER BRAKE ACTUATION 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 F .
	Base brake system	REFER to BRAKE SYSTEM - GENERAL INFORMATION article.
The traction control system is inoperative	Wiring, terminals or connectors Traction control switch ABS module Instrument cluster	Go to Pinpoint Test G .
The traction control system cannot be disabled	Wiring, terminals or connectors Traction control switch Instrument cluster	Go to Pinpoint Test G .
The traction control switch indicator is never/always on	Wiring, terminals or connectors Traction control switch ABS module Instrument cluster	REFER to Diagnosis and Testing in INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES article.