Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 481
9B-9 Lighting Systems:
Headlight Symptom Diagnosis (Vehicle Equipped With Discharge Headlight)
S6JB0A9204003
Headlight Symptom diagnosis (Vehicle Not Equipped With Discharge Headlight)
S6JB0A9204004
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
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 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
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.
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
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 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
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.
Lighting Systems: 9B-10
Auto-On Headlight System Symptom Diagnosis (If Equipped)
S6JB0A9204005
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)
S6JB0A9204006
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)
S6JB0A9204007
Headlight Manual Leveling System Symptom Diagnosis (If Equipped)
S6JB0A9204008
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): For Petrol
Engine Model in Section 1J” / “Generator Test
(Undercharged Battery Check): For Diesel
Engine Model in Section 1J” or “Generator Test
(Overcharged Battery Check): For Petrol
Engine Model in Section 1J” / “Generator Test
(Overcharged Battery Check): For Diesel
Engine Model 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
Inspection (If Equipped)”.
Supply voltage too low
Check charging system referring to “Generator
Test (Undercharged Battery Check): For Petrol
Engine Model in Section 1J” or “Generator Test
(Undercharged Battery Check): For Diesel
Engine Model 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
S6JB0A9204009
Clearance, Tail and License Plate Light Symptom Diagnosis
S6JB0A9204010
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.
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