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Suzuki Grand Vitara JB416 / JB420 / JB419. Service manual - part 482

9B-13 Lighting Systems:

Back-Up Light Symptom Diagnosis

S6JB0A9204011

Brake Light Symptom Diagnosis

S6JB0A9204012

Front Fog Light Symptom Diagnosis (If Equipped)

S6JB0A9204013

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

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: For Petrol Engine Model in
Section 5B”, “Back Up Light Switch Inspection:
For Diesel Engine Model 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

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”.

Lighting Systems: 9B-14

Rear Fog Light Symptom Diagnosis (If Equipped)

S6JB0A9204014

Illumination Control System Symptom Diagnosis (If Equipped)

S6JB0A9204015

Interior Light Symptom Diagnosis

S6JB0A9204016

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

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.

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.

9B-15 Lighting Systems:

Auto-On Headlight Operation Inspection (If
Equipped)

S6JB0A9204017

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 lamp 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.

DRL Operation Inspection (If Equipped)

S6JB0A9204018

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)

S6JB0A9204019

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.

[A]: Fig. for Step a)

[B]: Fig. for Step b)

[A]

[B]

I5JB0A920013-02

Lighting Systems: 9B-16

[A]

I5JB0A920014-02

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

Terminal

Circuit

Specification

Condition

Power source

10 – 14 V

Ignition switch is at ON position.

—

Lighting switch

Less than 1.5 V

Lighting switch is at “HEAD”

position.

10 – 14 V

Lighting switch is at OFF position.

—

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).

—

Ground for headlight auto leveling
control unit

0 V

Ignition switch is at ON position.

Power supply for right headlight
leveling actuator

10 – 14 V

Ignition switch is at ON position.

Power supply for left headlight
leveling actuator

10 – 14 V

Ignition switch is at ON position.

Power supply for rear height
sensor

About 5 V

Ignition switch is at ON position.

Power supply for front height
sensor

About 5 V

Ignition switch is at ON position.

—

Vehicle speed signal

Refer to “Reference waveform No.1: ”.

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.

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.

Input signal for rear height sensor

About 2.5 V

Ignition switch is at ON position.

Input signal for front height sensor

About 2.5 V

Ignition switch is at ON position.

Ground for rear height sensor

0 V

Ignition switch is at ON position.

Ground for front height sensor

0 V

Ignition switch is at ON position.

Ground for right headlight leveling
actuator

0 V

Ignition switch is at ON position.

Ground for left headlight leveling
actuator

0 V

Ignition switch is at ON position.

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