Symptom Troubleshooting Chart - Headlamps

SYMPTOM TROUBLESHOOTING CHART - HEADLAMPS

Problem	Possible Cause	Action
No communication with the smart junction box (SJB)	SJB Circuitry	See COMMUNICATIONS NETWORK DIAGNOSIS .
Headlamps are inoperative (both)	Smart junction box (SJB) Main light switch Circuitry Multifunction switch	See HEADLAMPS INOPERATIVE (BOTH) .
Headlamps, low beams are inoperative	Smart junction box (SJB) Circuitry Multifunction switch	See HEADLAMPS, LOW BEAMS INOPERATIVE .
Headlamps, high beams are inoperative	Smart junction box (SJB) Circuitry Multifunction switch	See HEADLAMPS, HIGH BEAMS INOPERATIVE .
Headlamps, one low beam headlamp is inoperative	Smart junction box (SJB) Circuitry	If the LH low beam headlamp is inoperative, Repair circuit W/LG. If the RH low beam headlamp is inoperative, Repair circuit DL/LG.
Headlamps, one high beam headlamp is inoperative	Circuitry	Repair circuit LG/B.
Headlamps are on continuously	Circuitry Main light switch Multifunction switch Smart junction box (SJB)	See HEADLAMPS ARE ON CONTINUOUSLY .
Flash-to-pass feature is inoperative	Circuitry Multifunction switch Smart junction box (SJB)	See FLASH-TO-PASS FEATURE IS INOPERATIVE .