Symptom Chart

Condition	Possible Sources	Action
Both headlamps are inoperative	Smart junction box (SJB)	INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
The low beams are inoperative	Headlamp switch Multifunction switch SJB	INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
The high beams are inoperative	Fuse Circuitry High beam relay Multifunction switch Bussed electrical center (BEC) SJB	Go to Pinpoint Test A .
One low beam headlamp is inoperative	Circuitry BEC SJB	Go to Pinpoint Test B .
One high beam headlamp is inoperative	Circuitry	REPAIR circuit 1337 (VT/YE). TEST the system for normal operation.
The headlamps are on continuously	Circuitry High beam relay BEC SJB	Go to Pinpoint Test C .
The flash-to-pass feature is inoperative	Multifunction switch	INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES article. TEST the system for normal operation.