Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the anti-lock brake system (ABS) module	Circuitry ABS module	GO to PINPOINT TEST A .
No communication with the instrument cluster	Circuitry Instrument cluster	REFER to INSTRUMENT CLUSTER to continue diagnosis of the communication network.
The red brake warning indicator does not self-check	Circuitry Instrument cluster	REFER to INSTRUMENT CLUSTER to continue diagnosis of the red brake warning indicator.
The red brake warning indicator stays on when the ignition is in RUN	Base brake system Circuitry Low brake fluid warning switch Parking brake switch Anti-lock brake system (ABS) module Instrument cluster	REFER to INSTRUMENT CLUSTER to continue diagnosis of the red brake warning indicator.
The yellow anti-lock brake system (ABS) warning indicator does not self-check	Circuitry Instrument cluster	REFER to INSTRUMENT CLUSTER to continue diagnosis of the yellow brake warning indicator.
Spongy/soft/low brake pedal with no warning indicator	Air in brake hydraulic system Base brake system Hydraulic control unit (HCU)	GO to PINPOINT TEST G .
Poor vehicle tracking during anti-lock function	Tire pressure	REFER to BRAKE SYSTEM-GENERAL INFORMATION to continue diagnosis of the brake system.
	Air in the brake system
	Base brake system
	Hydraulic control unit (HCU).	GO to PINPOINT TEST H .
The traction control is inoperative	Circuitry Traction control switch Anti-lock brake system (ABS) module	INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE .
The traction control system cannot be disabled	Circuitry Traction control switch Instrument cluster Anti-lock brake system (ABS) module	GO to PINPOINT TEST I .
The traction control switch indicator is never/always on	Circuitry Traction control switch Anti-lock brake system (ABS) module Instrument cluster	GO to PINPOINT TEST J .