Suzuki Grand Vitara JB627. Manual - part 372

9B-13 Lighting Systems: 

Back-Up Light Symptom Diagnosis

S6JB0B9204011

Brake Light Symptom Diagnosis

S6JB0B9204012

Front Fog Light Symptom Diagnosis (If Equipped)

S6JB0B9204013

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.

 

Rear Fog Light Symptom Diagnosis (If Equipped)

S6JB0B9204014

Condition

Possible cause

Correction / Reference Item

Back-up lights do not 
light up

Bulb(s) blown

Replace bulb(s).

Circuit fuse blown

Replace fuse and check for short circuit.

Back-up light switch (M/T model) or 
transmission range sensor (A/T model) 
faulty

Check back-up light switch or transmission 
range sensor referring to “Back Up Light 
Switch Inspection in Section 5B” or 
“Transmission Range Sensor Inspection and 
Adjustment in Section 5A”.

Wiring or grounding faulty

Repair circuit.

Back-up lights stay on

Back-up light switch (M/T model) or 
transmission range sensor (A/T model) 
faulty

Check back-up light switch or transmission 
range sensor referring to “Back Up Light 
Switch Inspection in Section 5B” or 
“Transmission Range Sensor Inspection and 
Adjustment in Section 5A”.

Condition

Possible cause

Correction / Reference Item

Brake light do not light up Bulb(s) blown

Replace bulb(s).

Circuit fuse blown

Replace fuse and check for short circuit.

Brake light switch faulty

Check brake light switch referring to “Brake 
Light Switch Inspection”.

Wiring or grounding faulty

Repair circuit.

Brake light stay on

Brake light switch faulty

Check or adjust brake light switch referring to 
“Brake Light Switch Inspection” or “Brake Light 
Switch Adjustment in Section 4A”.

Condition

Possible cause

Correction / Reference Item

Only one light does not 
light

Bulb blown

Replace bulb.

Wiring or grounding faulty

Repair circuit.

Front fog lights do not 
light

Circuit fuse blown

Replace fuse and check for short circuit.

Bulbs blown

Replace bulbs.

Front fog light switch faulty

Check front fog light switch referring to “Front 
Fog Light Switch Inspection (If Equipped)”.

Front fog light relay faulty

Check front fog light relay referring to “Front 
Fog Light Relay Inspection (If Equipped)”.

Wiring or grounding 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

Rear fog light do not light Circuit fuse blown

Replace fuse and check for short circuit.

Bulb blown

Replace bulb.

Rear fog light switch faulty

Check rear fog light switch referring to “Rear 
Fog Light Switch Inspection (If Equipped)”.

Wiring or grounding faulty

Repair circuit.

Lighting Systems:  9B-14

Illumination Control System Symptom Diagnosis (If Equipped)

S6JB0B9204015

Interior Light Symptom Diagnosis

S6JB0B9204016

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.

 

Auto-On Headlight Operation Inspection (If 
Equipped)

S6JB0B9204017

1) Turn ignition switch to ON position and then turn 

lighting switch to “AUTO” position.

2) Release parking brake lever.
3) Check headlights for operation as follows. If 

headlights do not turn ON or OFF, go to “Auto-On 
Headlight System Symptom Diagnosis (If 
Equipped)”.
a) Cover auto-on headlight sensor by hand and 

check that headlights light up then.

b) Light over auto-on headlight sensor vertically 

with on incandescent light of approx, 100 W 
apart from about 100 mm (3.94 in.) (1) and check 
that headlights go off then.

c) In the state as described in Step a), pull up 

parking brake lever and check that headlights go 
off then.

Condition

Possible cause

Correction / Reference Item

Illumination cancel do not 
normal operation

Combination meter faulty

Replace combination meter.

Audio unit and/or information display 
(clock) faulty

Replace audio unit and/or information display 
(clock).

Wiring or grounding faulty

Repair circuit.

Condition

Possible cause

Correction / Reference Item

Dome light does not light 
up

Bulb blown

Replace bulb.

Circuit fuse blown

Replace fuse and check for short circuit.

Dome light switch faulty

Check dome light switch.

Door switch faulty

Check door switch referring to “Door Switch 
(Front / Rear / Rear End Door) Inspection in 
Section 9C”.

Wiring or grounding

Repair circuit.

BCM faulty

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

Luggage compartment 
light does not light up (if 
equipped)

Bulb blown

Replace bulb.

Back door switch faulty

Check switch referring to “Door Switch (Front / 
Rear / Rear End Door) Inspection in Section 
9C”.

Wiring or grounding faulty

Repair circuit.

[A]: Fig. for Step a)

[B]: Fig. for Step b)

[A]

[B]

1

I5JB0A920013-02

9B-15 Lighting Systems: 

DRL Operation Inspection (If Equipped)

S6JB0B9204018

1) Confirm that lighting switch is in OFF position.
2) Confirm that dimmer and passing switch is in low beam position.
3) Check DRL for operation as follows.

a) Turn ignition switch to ON position and check headlights remain OFF.
b) Start engine and run it at idle speed. Check headlights turn ON at low beam.
c) Switch dimmer and passing switch to high beam position and check headlights remain tuning ON at low beam.

4) If a malfunction is found, go to “DRL System Symptom Diagnosis (If Equipped)”.

Inspection of Headlight Leveling Control Module and Its Circuit (Vehicle Equipped with Auto 
Leveling Headlight System)

S6JB0B9204019

Headlight auto leveling control module and its circuits can be checked at headlight auto leveling control module wiring 
couplers by measuring voltage and pulse signal.

CAUTION

!

 

Headlight auto leveling control module cannot be checked by itself. It is strictly prohibited to connect 
voltmeter or ohmmeter to headlight auto leveling control module with couplers disconnected from it.

 

Voltage Check
Check voltage between each terminal of headlight auto leveling control module and vehicle body ground under each 
condition. If measured voltage is out of standard value, check circuit (including switch and sensor) of terminal where 
voltage was measured.

NOTE

• As each terminal voltage is affected by the battery voltage, confirm that it is 11 V or more when 

ignition switch is ON.

• Voltage with asterisk (*) cannot be measured by voltmeter because it is pulse signal. Check it with 

oscilloscope if necessary.

 

V

10

11

12

13

16

17

18

19

20

3

1

5

6

9

21

22

23

24

[A]

I5JB0A920014-02

[A]: Headlight leveling control module connector (viewed from harness side)

Lighting Systems:  9B-16

Terminal

Circuit

Specification

Condition

1

Power source

10 – 14 V

Ignition switch is at ON position.

2

—

—

—

3

Lighting switch

Less than 1.5 V

Lighting switch is at “HEAD” 

position.

10 – 14 V

Lighting switch is at OFF position.

4

—

—

—

5

—

—

—

6

Headlight auto leveling indicator

Continuity

For about 3 seconds after ignition 
switch is turned on (i.e., headlight 

auto leveling indicator is lit up).

No continuity

More than about 3 seconds after 

ignition switch is turned on (i.e., 

headlight auto leveling indicator is 

not lit up).

7

—

—

—

8

—

—

—

9

Ground for headlight auto leveling 
control unit

0 V

Ignition switch is at ON position.

10

Power supply for right headlight 
leveling actuator

10 – 14 V

Ignition switch is at ON position.

11

Power supply for left headlight 
leveling actuator

10 – 14 V

Ignition switch is at ON position.

12

Power supply for rear height 
sensor

About 5 V

Ignition switch is at ON position.

13

Power supply for front height 
sensor

About 5 V

Ignition switch is at ON position.

14

—

—

—

15

—

—

—

16

Vehicle speed signal

Refer to “Reference waveform No.1: ”.

17

Signal for right headlight leveling 
actuator

Less than 1 V

Lighting switch is at OFF position.

1.0 – 12.6 V

For 10 seconds after turning 

lighting switch to ON position.

18

Signal for left headlight leveling 
actuator

Less than 1 V

Lighting switch is at OFF position.

1.0 – 12.6 V

For 10 seconds after turning 

lighting switch to ON position.

19

Input signal for rear height sensor

About 2.5 V

Ignition switch is at ON position.

20

Input signal for front height sensor

About 2.5 V

Ignition switch is at ON position.

21

Ground for rear height sensor

0 V

Ignition switch is at ON position.

22

Ground for front height sensor

0 V

Ignition switch is at ON position.

23

Ground for right headlight leveling 
actuator

0 V

Ignition switch is at ON position.

24

Ground for left headlight leveling 
actuator

0 V

Ignition switch is at ON position.