Power Door Lock System Symptom Diagnosis

WARNING: This page is about a different car, the 2008 Suzuki Grand Vitara, 2007 Suzuki Grand Vitara, and 2006 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Use of SUZUKI scan tool makes it easy to check whether a faulty condition is on the input side or output side of BCM. For checking procedure, refer to "DIAGNOSIS USING OUTPUT TEST FUNCTION OF SUZUKI SCAN TOOL ".
Check each part in the order from the top of the following list.

POWER DOOR LOCK SYSTEM SYMPTOM DIAGNOSIS

Condition	Possible Cause	Action
All door cannot be locked/unlocked by all of switches	Circuit fuse blown	Replace fuse and check for short circuit .
	Wiring or grounding faulty	Repair circuit .
	BCM faulty	Replace after making sure that none of above parts is faulty .
All door cannot be locked/unlocked by only power door lock switch	Circuit fuse blown	Replace fuse and check for short circuit .
	Power door lock switch faulty	Check power door lock switch referring to POWER DOOR LOCK SWITCH INSPECTION .
	Wiring harness connected to power door lock switch faulty	Repair .
	Wiring or grounding faulty	Repair circuit .
	BCM faulty	Replace after making sure that none of above parts is faulty .
All door cannot be locked/unlocked by only key cylinder switch	Circuit fuse blown	Replace fuse and check for short circuit .
	Key cylinder switch faulty	Check key cylinder switch referring to DOOR KEY CYLINDER SWITCH INSPECTION .
	Wiring or grounding faulty	Repair circuit .
	BCM faulty	Replace after making sure that none of above parts is faulty .
Only one door cannot be locked/unlocked	Power door lock actuator faulty	Check actuator referring to POWER DOOR LOCK ACTUATOR INSPECTION (IF EQUIPPED) .
	Wiring harness connected to applicable door lock actuator faulty	Repair .
	BCM faulty	Replace after making sure that none of above parts is faulty .