Symptom Chart

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. 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)	Circuitry. SJB.	Refer to MODULE COMMUNICATIONS NETWORK .
Both headlamps are inoperative	Smart junction box (SJB).	INSTALL a new SJB. Refer to SMART JUNCTION BOX (SJB) . TEST the system for normal operation.
The low beams are inoperative	Headlamp switch Multifunction switch. Smart junction box (SJB).	CARRY out the headlamp switch component test. Refer to COMPONENT TESTING for schematic and connector information . If the headlamp switch is OK, INSTALL a new SJB. Refer to SMART JUNCTION BOX (SJB) . TEST the system for normal operation. If the headlamp switch is not OK, INSTALL a new headlamp switch. Refer to HEADLAMP SWITCH . TEST the system for normal operation.
The high beams are inoperative	Circuitry. High beam relay. Multifunction switch. Bussed electrical center (BEC). Smart junction box (SJB).	Go To PINPOINT TEST A: THE HIGH BEAMS ARE INOPERATIVE .
One low beam headlamp is inoperative	Circuitry. Bussed electrical center (BEC). Smart junction box (SJB).	Go To PINPOINT TEST B: ONE LOW BEAM HEADLAMP IS INOPERATIVE .
One high beam headlamp is inoperative	Circuitry.	REPAIR circuit 1335 (YE/WH) (RH high beam) or 1337 (VT/YE) (LH high beam) as necessary. TEST the system for normal operation.
The headlamps are on continuously	Circuitry. High beam relay. Bussed electrical center (BEC). Smart junction box (SJB).	Go To PINPOINT TEST C: THE HEADLAMPS ARE ON CONTINUOUSLY .
The flash-to-pass feature is inoperative	Multifunction switch.	INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . TEST the system for normal operation.