Suzuki Grand Vitara JB627. Manual - part 371

9B-9 Lighting Systems: 

Headlight Symptom Diagnosis (Vehicle Equipped with Discharge Headlight)

S6JB0B9204003

Headlight Symptom Diagnosis (Vehicle Not Equipped with Discharge Headlight)

S6JB0B9204004

Condition

Possible cause

Correction / Reference Item

Only one low beam does 
not light up

Circuit fuse blown

Replace fuse and check for short circuit.

Bulb faulty

Replace bulb.

Igniter faulty

Replace igniter.

Ballast faulty

Replace ballast.

Wiring or ground faulty

Repair circuit.

Low beam does not light 
up

Circuit fuses 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 faulty

Replace bulbs.

Igniters faulty

Replace igniters.

Ballasts faulty

Replace ballasts.

Wiring or ground faulty

Repair circuit.

BCM faulty

Check BCM for function referring to “Inspection 
of BCM and Its Circuits in Section 10B”.

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 fuses 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.

Condition

Possible cause

Correction / Reference Item

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 “Inspection 
of BCM and Its Circuits in Section 10B”.

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.

Lighting Systems:  9B-10

Auto-On Headlight System Symptom Diagnosis (If Equipped)

S6JB0B9204005

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.

 

DRL System Symptom Diagnosis (If Equipped)

S6JB0B9204006

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

Possible cause

Correction / Reference Item

Headlights are not turned 
ON or OFF automatically 
even after darkened or 
lightened

Circuit fuse blown

Replace fuse and check for short circuit.

Parking brake switch faulty

Check parking brake switch referring to 
“Parking Brake Switch Inspection in Section 
9C”.

Lighting or dimmer switch faulty

Check lighting and dimmer switch referring to 
“Headlight Switch (in Lighting Switch) 
Inspection”.

Auto-on headlight sensor faulty

Check auto-on headlight sensor referring to 
“Auto-On Headlight Sensor Inspection (If 
Equipped)”.

Wiring or ground faulty

Repair circuit.

BCM faulty

Check BCM for function referring to “Inspection 
of BCM and Its Circuits in Section 10B”.

Condition

Possible cause

Correction / Reference Item

Headlight does not light 
when lighting switch is in 
OFF position and engine 
is running

Lighting switch faulty

Check lighting switch referring to “Headlight 
Switch (in Lighting Switch) Inspection”.

BCM faulty

Check BCM for function referring to “Inspection 
of BCM and Its Circuits in Section 10B”.

Wiring or grounding faulty

Repair circuit.

Headlight lights even if 
engine stop and lighting 
switch is OFF position

Lighting switch faulty

Check system referring to “Headlight Switch (in 
Lighting Switch) Inspection”.

Wiring or grounding faulty

Repair circuit.

BCM faulty

Check BCM for function referring to “Inspection 
of BCM and Its Circuits in Section 10B”.

9B-11 Lighting Systems: 

Headlight Auto Leveling System Symptom Diagnosis (If Equipped)

S6JB0B9204007

Headlight Manual Leveling System Symptom Diagnosis (If Equipped)

S6JB0B9204008

Condition

Possible cause

Correction / Reference Item

Headlight leveling 
Warning Light comes on 
steady

Height sensor faulty

Check height sensor referring to “Height 
Sensor and Its Circuit Inspection (If 
Equipped)”.

Wiring or ground faulty

Repair circuit.

Headlight leveling control module faulty Check headlight leveling control module for 

function referring to “Inspection of Headlight 
Leveling Control Module and Its Circuit 
(Vehicle Equipped with Auto Leveling 
Headlight System)”.

Optical axes of both 
headlights do not change

Circuit fuse blown

Replace fuse and check for short circuit.

Supply voltage too low or too high

Check charging system referring to “Generator 
Test (Undercharged Battery Check) in Section 
1J” or “Generator Test (Overcharged Battery 
Check) in Section 1J”.

Wiring or ground faulty

Repair circuit.

Headlight leveling control module faulty Check headlight leveling control module for 

function referring to “Inspection of Headlight 
Leveling Control Module and Its Circuit 
(Vehicle Equipped with Auto Leveling 
Headlight System)”.

Optical axis of only one 
headlight does not 
change

Headlight levering actuator faulty

Check actuator referring to “Headlight Leveling 
Actuator Inspection (If Equipped)”.

Headlight housing deformed

Replace headlight housing.

Wiring or ground faulty

Repair circuit.

Condition

Possible cause

Correction / Reference Item

Optical axes of both 
headlights do not change

Circuit fuse blown

Replace fuse and check for short circuit.

Headlight manual leveling switch faulty Check headlight manual leveling switch 

referring to “Headlight Manual Leveling Switch 
(If Equipped) Inspection”.

Supply voltage too low

Check charging system referring to “Generator 
Test (Undercharged Battery Check) in Section 
1J”.

Wiring or grounding faulty

Repair circuit.

Optical axis of only one 
headlight does not 
change

Circuit fuse blown

Replace fuse and check for short circuit.

Headlight leveling actuator faulty

Check actuator referring to “Headlight Leveling 
Actuator Inspection (If Equipped)”.

Headlight housing deformed

Replace headlight housing.

Wiring or grounding faulty

Repair circuit.

Lighting Systems:  9B-12

Turn Signal and Hazard Warning Light Symptom Diagnosis

S6JB0B9204009

Clearance, Tail and License Plate Light Symptom Diagnosis

S6JB0B9204010

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

Possible cause

Correction / Reference Item

Flash rate high or one 
side only flashes

Bulb blown on “flash rate high”-side

Replace bulb.

Incorrect bulb

Replace bulb.

Turn signal / hazard warning relay faulty Check turn signal / hazard warning relay 

referring to “Turn Signal and Hazard Warning 
Relay Inspection”.

Open circuit or high resistance existing 
either; between turn signal switch and 
non lighting bulb, or between hazard 
warning switch and non lighting bulb

Repair circuit.

Wiring or grounding faulty

Repair circuit.

No flashing

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.

 

Circuit fuse(s) blown

Replace fuse(s) and check for short circuit.

Turn signal / hazard warning relay faulty Check turn signal / hazard warning relay 

referring to “Turn Signal and Hazard Warning 
Relay Inspection”.

Turn signal light switch faulty

Check turn signal light switch referring to “Turn 
Signal Light Switch (in Lighting Switch) 
Inspection”.

Hazard warning switch faulty

Check hazard warning switch referring to 
“Hazard Warning Switch Inspection”.

Open circuit or high resistance existing 
between battery and switch

Repair circuit.

Wiring or grounding faulty

Repair circuit.

BCM faulty

Replace after making sure that none of above 
parts is faulty.

Flash rate low

Supply voltage low

Check charging system.

Turn signal / hazard warning relay faulty Check turn signal / hazard warning relay 

referring to “Turn Signal and Hazard Warning 
Relay Inspection”.

Condition

Possible cause

Correction / Reference Item

All lights do not light up

Circuit fuse blown

Replace fuse and check for short circuit.

Lighting and dimmer switch of 
combination switch faulty

Check lighting and dimmer switch referring to 
“Headlight Switch (in Lighting Switch) 
Inspection”.

Tail light relay faulty

Check tail light relay referring to “Tail Light 
Relay, Headlight Relay Inspection”.

Wiring or grounding faulty

Repair circuit.

BCM faulty

Check BCM for function referring to “Inspection 
of BCM and Its Circuits in Section 10B”.

Some lights do not light 
up

Bulb(s) blown

Replace bulb(s).

Wiring or grounding faulty

Repair circuit.