Symptom Chart

SYMPTOM

Condition	Possible Sources	Action
No communication with the anti-lock brake control module	Fuse. Circuit. ABS control module.	GO to PINPOINT TEST A: NO COMMUNICATION WITH THE ANTI-LOCK BRAKE CONTROL .
Unable to enter self-test - communication OK	ABS control module.	GO to PINPOINT TEST B: UNABLE TO ENTER SELF-TEST .
The red brake warning indicator does not self-check	Low brake fluid warning switch. Circuit. Hybrid electronic cluster (HEC). Ignition switch. Parking brake.	REFER to INSTRUMENT CLUSTER .
The red brake warning indicator stays on when the ignition switch is in RUN	Low brake fluid warning switch. Circuit. Hybrid electronic cluster (HEC). Ignition switch. Parking brake.	REFER to INSTRUMENT CLUSTER .
The yellow ABS warning indicator does not self-check - always on, no DTCs	Circuit. ABS control module. Hybrid electronic cluster (HEC).	GO to PINPOINT TEST I: THE YELLOW ABS WARNING INDICATOR DOES NOT SELF-CHECK-ALWAYS ON, NO DTCS .
Spongy brake pedal with no warning indicator	Air in hydraulic brake system.	GO to PINPOINT TEST J: SPONGY BRAKE PEDAL WITH NO WARNING INDICATOR .
Base brake system.		REFER to BRAKE SYSTEM-GENERAL INFORMATION .
Poor vehicle tracking during anti-lock function	Air in hydraulic brake system. Hydraulic control unit, Base brake system.	GO to PINPOINT TEST K: POOR VEHICLE TRACKING DURING ANTI-LOCK FUNCTION . REFER to BRAKE SYSTEM-GENERAL INFORMATION .