Auto-On Headlight System Symptom Diagnosis (If Equipped); Drl System Symptom Diagnosis (If Equipped) - Suzuki GRAND VITARA Owner's Manual

9B-10 Lighting Systems:

Auto-On Headlight System Symptom Diagnosis (If Equipped)

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" under "Scan Tool Data: in Section 10B".
• Check each part in the order from the top of the following list.
Condition
Headlights are not turned
ON or OFF automatically
even after darkened or
lightened

DRL System Symptom Diagnosis (If Equipped)

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.
Condition
Headlight does not light
when lighting switch is in
OFF position and engine
is running
Headlight lights even if
engine stop and lighting
switch is OFF position
Possible cause
Circuit fuse blown
Parking brake switch faulty
Lighting or dimmer switch faulty
Auto-on headlight sensor faulty
Wiring or ground faulty
BCM faulty
Possible cause
Lighting switch faulty
BCM faulty
Wiring or grounding faulty
Lighting switch faulty
Wiring or grounding faulty
BCM faulty
Correction / Reference Item
Replace fuse and check for short circuit.
Check parking brake switch referring to
"Parking Brake Switch Inspection: in Section
9C".
Check lighting and dimmer switch referring to
"Headlight Switch (in Lighting Switch)
Inspection: ".
Check auto-on headlight sensor referring to
"Auto-On Headlight Sensor Inspection (If
Equipped): ".
Repair circuit.
Check BCM for function referring to "Inspection
of BCM and its Circuits: in Section 10B".
Correction / Reference Item
Check lighting switch referring to "Headlight
Switch (in Lighting Switch) Inspection: ".
Check BCM for function referring to "Inspection
of BCM and its Circuits: in Section 10B".
Repair circuit.
Check system referring to "Headlight Switch (in
Lighting Switch) Inspection: ".
Repair circuit.
Check BCM for function referring to "Inspection
of BCM and its Circuits: in Section 10B".
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