Symptom Chart

WARNING: This page is about a different car, the 2009 Mercury Sable, 2009 Ford Taurus X, and 2009 Ford Taurus. 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 article.
Both low beams are inoperative	Incorrect aftermarket headlamp bulbs	NOTE: Due to varying wattage ratings and resulting current draw differences, certain aftermarket headlamp bulbs may cause the SJB to shut down the short circuit protection, resulting in the low beams becoming inoperative. Verify that the bulbs meet Ford specifications. INSTALL the correct bulbs. RUN the on-demand self-test (required to clear certain DTCs and reset the SJB). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
	SJB	CHECK for recorded SJB DTCs. If DTCs are present, REFER to SMART JUNCTION BOX (SJB) DTC TABLE . If no DTCs are present, INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
Both high beams are inoperative	Fuse Wiring, terminals or connectors Multifunction switch SJB	Go to Pinpoint Test A .
One low beam headlamp is inoperative	Fuse Wiring, terminals or connectors Headlamp assembly SJB	Go to Pinpoint Test B .
One high beam headlamp is inoperative	Wiring, terminals or connectors Headlamp assembly	Go to Pinpoint Test C .
The headlamp(s) are on continuously	Wiring, terminals or connectors Headlamp switch Multifunction switch Windshield wiper motor SJB	Go to Pinpoint Test D .
The flash-to-pass feature is inoperative	Wiring, terminals or connectors Multifunction switch SJB	Go to Pinpoint Test E .