Symptom Chart

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
The horn is inoperative	Fuse Circuitry Horn Horn relay Steering wheel switch harness Clockspring Lighting control module (LCM) Horn switch (part of the driver air bag module)	GO to PINPOINT TEST A .
The horn is always on	Circuitry Horn relay Lighting control module (LCM) Clockspring Horn switch (part of the driver air bag module) Steering wheel switch harness	GO to PINPOINT TEST B .