Symptom Chart

WARNING: This page is about a different car, the 2009 Ford Mustang. 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)	Fuse Wiring, terminals or connectors SJB	REFER to MODULE COMMUNICATIONS NETWORK .
The fog lamps are inoperative	Fuse Wiring, terminals or connectors Fog lamp relay Headlamp switch Bussed electrical center (BEC) SJB	Go to Pinpoint Test P .
An individual fog lamp is inoperative	Wiring, terminals or connectors BEC	Go to Pinpoint Test Q .
The fog lamps are on continuously	Wiring, terminals or connectors Fog lamp relay Headlamp switch BEC SJB	Go to Pinpoint Test R .
The fog lamp on indicator is inoperative	Wiring, terminals or connectors Headlamp switch BEC	Go to Pinpoint Test S .