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Headlight Symptom Diagnosis

HEADLIGHT SYMPTOM DIAGNOSIS

Condition Possible Cause Action
Only one low beam does not light up  Circuit fuse blown Replace fuse and check for short circuit  .
Bulb blown Replace bulb  .
Wiring or ground faulty Repair circuit  .
Low beam does not light up  Circuit fuse blown Replace fuses and check for short circuit 
Headlight low beam relay faulty Replace relay  .
Lighting or dimmer switch faulty Check lighting and dimmer switch  referring to HEADLIGHT SWITCH (IN LIGHTING SWITCH) INSPECTION .
Bulbs blown Replace bulbs  .
Wiring or ground faulty Repair circuit  .
BCM faulty (with DRL vehicle or auto-on headlight vehicle) Check BCM for function  referring to BCM SELF-DIAGNOSIS FUNCTION .
Only one high beam does not light up  Circuit fuse blown Replace fuse and check for short circuit  .
Bulb blown Replace bulb  .
Wiring or ground faulty Repair circuit  .
High beam does not light up  Circuit fuse blown Replace fuses and check for short circuit 
Headlight high beam relay faulty Replace relay  .
Lighting or dimmer switch faulty Check lighting and dimmer switch  referring to HEADLIGHT SWITCH (IN LIGHTING SWITCH) INSPECTION .
Bulbs blown Replace bulbs  .
Wiring or ground faulty Repair circuit  .
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