Headlights Symptom Diagnosis

WARNING: This page is about a different car, the 2006 Suzuki XL-7. However, it is still accessible from the selected car via links, so may be relevant.

HEADLIGHTS SYMPTOM DIAGNOSIS

Condition	Possible Cause	Action
Only one light of headlights does not light	Bulb burnt out	Replace bulb.
	Fuse blown	Replace fuse.
	Socket, wiring or grounding faulty	Repair as necessary.
Headlights do not light	Main fuse and/or each circuit fuses blown	Replace main fuse and/or fuse to check for short.
	Headlight switch faulty	Check headlight switch referring to HEADLIGHT SWITCH (IN LIGHTING SWITCH) INSPECTION .
	Defective light relay	Check headlight relay referring to HEADLIGHT AND CLEARANCE LIGHT RELAYS INSPECTION .
	Headlight diode faulty	Check headlight diode referring to HEADLIGHT DIODE INSPECTION .
	Wiring or grounding faulty	Repair as necessary.
	BCM faulty	Check BCM referring to INSPECTION OF BCM AND ITS CIRCUITS .
Only one beam ("Hi" or "Lo") of headlights does not light	Bulb burnt out	Replace bulb.
	Headlight switch faulty	Check headlight switch referring to HEADLIGHT SWITCH (IN LIGHTING SWITCH) INSPECTION .
	Wiring or grounding faulty	Repair as necessary.
Headlights remains lighting even after lighting switch turned OFF	Wiring or grounding faulty	Repair as necessary.
	BCM faulty	Check BCM referring to INSPECTION OF BCM AND ITS CIRCUITS .