Symptom Chart

WARNING: This page is about a different car, the 2007 Ford Ranger. 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 smart junction box (SJB)	SJB	REFER to MODULE COMMUNICATIONS NETWORK article.
The horn is inoperative	Fuse(s) Circuitry Horn Clockspring Horn switch (part of the steering wheel) SJB	Go to Pinpoint Test A .
The horn is always on	Circuitry Clockspring Horn switch (part of the steering wheel) SJB	Go to Pinpoint Test B .