Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the anti-lock brake system (ABS) module	Fuse ABS module Circuitry	GO to PINPOINT TEST F .
Poor vehicle tracking during anti-lock function	Air in brake hydraulic system Hydraulic control unit (HCU)	GO to PINPOINT TEST G .
Poor vehicle tracking during anti-lock function	Base brake system	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
The traction control is inoperative	Anti-lock brake system (ABS) module Electronic control unit (ECU)	GO to PINPOINT TEST H .
The traction control is inoperative	Base brake system	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
The yellow (ABS) anti-lock brake system warning indicator does not self-check	Instrument cluster Circuitry	GO to PINPOINT TEST I .
The yellow anti-lock brake system (ABS) warning indicator always on	ABS module connector not connected	CONNECT the ABS module connector C135.
	Circuitry ABS module	GO to PINPOINT TEST J .
	Instrument cluster	Section 418-00.
Traction control active indicator never on	ABS module Circuitry Instrument cluster	REFER to INSTRUMENT CLUSTER .
The traction control cannot be disabled	Circuitry Traction control switch ABS module	GO to PINPOINT TEST H .
Traction control switch indicator is always on	Circuitry Traction control switch ABS module Lighting control module (LCM)	GO to PINPOINT TEST L .
Traction control switch indicator is never on	Circuitry Traction control switch ABS module Lighting control module (LCM) Instrument cluster	GO to PINPOINT TEST M .
Red brake warning indicator always on without anti-lock brake system (ABS) lamp	Parking brake Brake fluid level	REFER to BRAKE SYSTEM-GENERAL INFORMATION .