Symptom Chart

Refer to SYSTEM WIRING DIAGRAMS for Expedition or SYSTEM WIRING DIAGRAMS for Navigator for ABS for schematic and connector information.

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the anti-lock brake system (ABS) module	Battery junction box (BJB) fuse(s): 16 (10A) 103 (30A) 112 (30A) 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 warning indicator does not self-check	Anti-lock brake system (ABS) module Circuitry	REFER to INSTRUMENT CLUSTER .
The stability assist system cannot be disabled	Circuitry Stability assist switch Anti-lock brake system (ABS) module	GO to PINPOINT TEST O .
The stability assist switch indicator is never/always on	Circuitry Stability assist switch Anti-lock brake system (ABS) module	GO to PINPOINT TEST O .
	Base brake system	REFER to BRAKE SYSTEM-GENERAL INFORMATION .
	Thermal model	Wait for brakes to cool down; the thermal model will reset automatically.