Symptom Chart

Refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

PROBLEM SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the anti-lock brake system (ABS) module	Front battery junction box (FBJB) fuse(s) 14(30A), 22 (40A). Circuitry. ABS module.	Go To PINPOINT TEST A: NO COMMUNICATION WITH THE ABS MODULE .
The yellow ABS warning indicator does not self-check	Circuitry. ABS module.	REFER to INFORMATION, GAUGES & WARNING DEVICES .
Spongy brake pedal with no warning indicator	Air in brake hydraulic system.	REFER to DISC article.
The Advance Trac®/IVD is inoperative	Rear battery junction box (RBJB) fuse(s) 22 (20A), 25 (40A). Circuitry. Advance Trac®/IVD switch. ABS module.	Go To PINPOINT TEST N: THE ADVANCE TRAC®/IVD IS INOPERATIVE .
The Advance Trac®/IVD system is always on/cannot be disabled	Circuitry. Advance Trac®/IVD switch. ABS module.	Go To PINPOINT TEST O: ADVANCE TRAC®/IVD SWITCH INDICATOR IS ALWAYS ON/CANNOT BE DISABLED .