Symptom Chart

Refer to ANTI-LOCK BRAKES for schematic and connector information.

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the anti - lock brake system (ABS) module	Auxiliary battery junction box (AJB) fuse(s) 14 (30A), 22 (40A) Circuitry ABS module	GO To PINPOINT TEST A .
The yellow ABS warning indicator does not self-check	Circuitry ABS module	REFER to INSTRUMENT CLUSTER .
Spongy brake pedal with no warning indicator	Air in the brake hydraulic system	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
The Advance Trac®/IVD is inoperative	Rear battery junction box (BJB) fuse(s) 22 (20A), 25 (40A) Circuitry Advance Trac®/IVD switch ABS module	Go To PINPOINT TEST N .
The Advance Trac®/IVD system is always on/cannot be disabled	Circuitry Advance Trac®/IVD switch ABS module	Go To PINPOINT TEST O .