Symptom Table

SYMPTOM TABLE

Condition	Possible Sources	Action
No communication with the ABS module	Fuse(s) Wiring, terminals or connectors ABS module	REFER to MODULE COMMUNICATIONS NETWORK article to diagnose the no communication problem.
The yellow ABS warning indicator is always/never on	Instrument Cluster (IC) ABS module	REFER to INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER AND WARNING CHIMES article to diagnose the yellow ABS warning indicator.
The yellow ABS warning indicator and the red brake warning indicator are both illuminated	ABS module connector not connected	VERIFY ABS module connector C135 is connected to the ABS module, CONNECT as necessary. If the connector is connected, DISCONNECT and INSPECT for corrosion, water contamination and spread terminals. REPAIR as necessary.
Wiring, terminals or connectors Parking brake switch Brake fluid level switch IC ABS module	REFER to INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER AND WARNING CHIMES article to diagnose the yellow ABS warning indicator and the red brake warning indicator.
Stability/traction control indicator ("sliding-car icon") is always/never on	IC ABS module	REFER to INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER AND WARNING CHIMES article to diagnose the stability/traction control indicator.
The LED on the stability/traction control switch is always illuminated	Wiring, terminals or connectors Stability/traction control switch IC Lighting Control Module (LCM)	GO to PINPOINT TEST J .
The LED on the stability/traction control switch is never illuminated	Wiring, terminals or connectors Stability/traction control switch LCM IC	GO to PINPOINT TEST K .
Poor vehicle tracking during anti-lock function	Air in brake hydraulic system Hydraulic Control Unit (HCU)	GO to PINPOINT TEST H .
Base brake system	REFER to DIAGNOSIS AND TESTING in .
The Engine Only Traction Control (EOTC) system cannot be disabled	Wiring, terminals or connectors Stability/traction control switch PCM	GO to PINPOINT TEST I .
The EOTC system is inoperative	The system is turned OFF Wiring, terminals or connectors Stability/traction control switch Wheel speed sensor DTC in the ABS module High Speed Controller Area Network (HS-CAN) bus fault PCM ABS module	GO to PINPOINT TEST L .