Symptom Chart

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. 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	SJB	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. If the bulbs do not 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. CHECK for recorded SJB DTCs. If DTCs are present, REFER to DTC Charts . 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 SJB	Go to Pinpoint Test B .
One high beam headlamp is inoperative	Wiring, terminals or connectors	Go to Pinpoint Test C .
The headlamps are on continuously	Wiring, terminals or connectors Headlamp switch Multifunction switch 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 .