Symptom Chart

NOTE: Refer to ANTI-LOCK BRAKES for connector numbers stated in the Pinpoint tests.

SYMPTOMS CHART

Condition	Possible Sources	Action
No communication with the anti-lock brake system (ABS) module	Ignition switch position. Central junction box (CJB) fuse 29 (15A). Circuitry. Diagnostic tool. ABS module.	Go To PINPOINT TEST A: NO COMMUNICATION WITH THE ANTI-LOCK BRAKE SYSTEM (ABS) MODULE .
Unable to enter self-test.	Ignition switch position. Diagnostic tool. Anti-lock brake system (ABS) module.	Go To PINPOINT TEST B: UNABLE TO ENTER SELF-TEST .
The red brake warning indicator stays on when the ignition switch is in RUN	Parking brake. Low brake fluid warning switch. Circuitry. Instrument cluster.	REFER to ANALOG INSTRUMENT PANELS .
The red brake warning indicator always on with ABS lamp	Anti-lock brake system (ABS) module connector not connected.	CONNECT the ABS module connector.
The red brake warning indicator always on with ABS lamp	Circuitry. Electronic brake distribution (EBD).	RETRIEVE the DTCs. REFER to the DIAGNOSTIC TROUBLE CODE INDEX .
The yellow ABS warning indicator does not self-check - always on, no DTCs	Circuitry. Anti-lock brake system (ABS) module. Instrument cluster.	Go To PINPOINT TEST I: THE YELLOW ABS WARNING INDICATOR DOES NOT SELF-CHECK - ALWAYS ON, NO DTCs .
Poor vehicle tracking during anti-lock function	Tire pressure. Air in the brake system. Base brake system.	REFER to DISC .
Poor vehicle tracking during anti-lock function	Hydraulic control unit (HCU).	Go To PINPOINT TEST J: POOR VEHICLE TRACKING DURING ANTI-LOCK FUNCTION .