Symptom Chart

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the anti-lock brake system (ABS) module	Circuitry ABS module	GO to PINPOINT TEST A .
The red brake warning indicator stays on when the ignition switch is in the RUN position	Circuitry Instrument cluster Brake fluid level sensor Anti-lock brake system (ABS) module.	REFER to INSTRUMENT CLUSTER .
The yellow anti-lock brake system (ABS) warning indicator does not self-check	Circuitry Instrument cluster ABS module	REFER to INSTRUMENT CLUSTER .
Spongy brake pedal with no warning indicator	Air in brake hydraulic system	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
The stability assist system cannot be disabled	Circuitry Stability traction control switch Anti-lock brake system (ABS) module	GO to PINPOINT TEST O .
The stability assist switch indicator is never/always on	Circuitry Stability traction control switch Anti-lock brake system (ABS) module	GO to PINPOINT TEST Q .
Advance Trac® indicator always on	Fuse Circuitry	CHECK for DTCs. CLEAR DTCs. REPEAT the self-test. If DTC U1900 is present and the 4x4 low indicator is illuminated, VERIFY that battery junction box (BJB) fuse 18 (20A) is OK. If OK, REFER to MODULE COMMUNICATIONS NETWORK for communication concern.