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 .
Both low beams are inoperative	Fuse Wiring, terminals or connectors Bussed electrical center (BEC) SJB	Go to Pinpoint Test A .
Both high beams are inoperative	Fuse Wiring, terminals or connectors SJB configuration High beam relay Multifunction switch BEC SJB	Go to Pinpoint Test B .
One low beam headlamp is inoperative - halogen headlamps	Wiring, terminals or connectors BEC SJB	Go to Pinpoint Test C .
One low beam headlamp is inoperative - high intensity discharge (HID) headlamps	Wiring, terminals or connectors HID relay BEC Ballast HID bulb Headlamp assembly SJB	Go to Pinpoint Test D .
One high beam headlamp is inoperative	Wiring, terminals or connectors Headlamp assembly BEC	Go to Pinpoint Test E .
The headlamps are on continuously	Wiring, terminals or connectors High beam relay HID relay Headlamp switch Multifunction switch BEC SJB	Go to Pinpoint Test F .
The flash-to-pass feature is inoperative	Wiring, terminals or connectors Multifunction switch SJB	Go to Pinpoint Test G .