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
The control illumination is inoperative	Circuitry Headlamp switch Instrument panel dimmer switch	GO to PINPOINT TEST A .
The instrument cluster illumination is inoperative	Circuitry Instrument cluster	GO to PINPOINT TEST B .
The climate control panel illumination is inoperative	Circuitry Manual climate control Front auxiliary A/C climate control Rear auxiliary A/C climate control Electronic automatic temperature control (EATC) module	GO to PINPOINT TEST C .
A single illumination source is inoperative	Circuitry Inoperative illumination source component	GO to PINPOINT TEST D .
The steering wheel control switch illumination source is inoperative	Circuitry Clockspring Steering wheel control switches Steering wheel control harness	GO to PINPOINT TEST E .
The instrument panel illumination does not dim	Circuitry Instrument panel dimmer switch Dimmer module	GO to PINPOINT TEST F .