Symptom Chart

WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

Diagnostics in this service information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to DIAGNOSTIC METHODS for information about these practices.

SYMPTOM CHART

Condition	Possible Sources	Action
Both low beams are inoperative	Bulbs Smart Junction Box (SJB)	VERIFY the bulbs are OK. If OK, GO to PINPOINT TEST B .
The low beams turn on after a 5-second delay when the headlamp switch is placed in the HEADLAMPS ON position	Wiring, terminals or connectors Headlamp switch SJB	GO to PINPOINT TEST D .
Both high beams are inoperative	Fuse Wiring, terminals or connectors Multifunction switch SJB	VERIFY the bulbs are OK. If OK, GO to PINPOINT TEST A .
One low beam headlamp is inoperative	Fuse Wiring, terminals or connectors Ballast High Intensity Discharge (HID) bulb Headlamp assembly SJB	VERIFY the bulb is OK. If OK, GO to PINPOINT TEST B .
One high beam headlamp is inoperative	Wiring, terminals or connectors Headlamp assembly	VERIFY the bulb is OK. If OK, GO to PINPOINT TEST C .
The low beam(s) are always on	Wiring, terminals or connectors Headlamp switch Ballast SJB	GO to PINPOINT TEST D .
The high beam(s) are always on	Wiring, terminals or connectors Multifunction switch SJB	GO to PINPOINT TEST E .
The flash-to-pass feature is inoperative	Wiring, terminals or connectors Multifunction switch SJB	GO to PINPOINT TEST F .