Headlight Symptom Diagnosis

WARNING: This page is about a different car, the 2008 Suzuki Grand Vitara and 2007 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.

HEADLIGHT SYMPTOM DIAGNOSIS TABLE

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	Check headlight relay referring to TAIL LIGHT RELAY, HEADLIGHT RELAY INSPECTION .
	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 INSPECTION OF BCM AND ITS CIRCUITS .
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	Check headlight relay by referring to TAIL LIGHT RELAY, HEADLIGHT RELAY INSPECTION .
	Lighting or dimmer switch faulty	Check lighting and dimmer switch by referring to HEADLIGHT SWITCH (IN LIGHTING SWITCH) INSPECTION .
	Bulbs blown	Replace bulbs .
	Wiring or ground faulty	Repair circuit .