Content .. 367 368 369 370 ..

Suzuki Grand Vitara JB627. Manual - part 369

9B-1 Lighting Systems:

Body, Cab and Accessories

Lighting Systems

Precautions

Precautions for Discharge Headlight Service (If Equipped)

S6JB0B9200001

WARNING

• Do not touch igniter or ballast when lighting switch is at “HEAD” position to avoid possible electric

shock.

• Do not measure voltage or resistance with tester connected to output connector of ballast or igniter

to avoid possible electric shock.

• Do not perform work where exposed to water including rain or with wet hands to avoid possible

electric shock.

• Disassembling igniter or ballast is strictly prohibited as it may cause an electric shock.
• Before inspecting or repairing discharge headlight or its peripheral parts, make sure that lighting

switch is at OFF position and battery is disconnected at negative terminal to avoid possible
electrical shock.

• Do not set lighting switch to “HEAD” position with connector disconnected or any part removed to

avoid possible electric shock.

• Do not touch glass surface of headlight bulb. Oil or grease attached on it may not only make bulb

service life shorter but also cause bulb to burst when lighting switch is turned on.

• Mercury, metal iodide and xenon gas are sealed in discharge headlight bulb. Be sure to dispose of

used discharge headlight bulb properly according to applicable rules or regulations.

Precautions in Diagnosing Troubles (Vehicle Equipped with Auto Leveling Headlight System)

S6JB0B9200002

• Be sure to read “Precautions for Electrical Circuit Service in Section 00” before inspection and observe what is

written there.

• Replacement of height sensor and headlight leveling control module. When height sensor and/or headlight leveling

control module is replaced with new one, perform initialization of auto leveling headlight system according to
“Initialization of Auto Leveling Headlight System”.

Lighting Systems: 9B-2

General Description

Discharge Headlight Description (If Equipped)

S6JB0B9201001

Discharge headlight provides more brightness and consumes less electricity as compared with the conventional
halogen headlight. It consists of a ballast (1), igniter (2) and discharge headlight bulb (3).

Ballast
Ballast makes the voltage from the battery rise and converts the current from DC to AC. It also outputs high voltage to
the igniter when the headlight is turned on and supplies to discharge headlight bulb with necessary voltage for
continuous lighting while it is lit.

Igniter
Igniter generates high voltage needed to turn on the discharge headlight. It is charged with high voltage raised by the
ballast and it applies voltage pulse as high as about 20,000 V to the tungsten electrode in the discharge headlight
bulb. After the discharge headlights light up, the ballast supplies voltage to bulbs.

Discharge Headlight Bulb
Discharge headlight bulb is used for the low beam. It does not have a filament but xenon gas (1), mercury (2) and
metal iodide sealed in it. It lights up when its tungsten electrodes (4) apply high voltage to these contents.

Fail-safe Function of Discharge Headlight
As the ballast has a fail-safe function which stops supply of the voltage to the igniter when it detects any of the
following condition.
• Ignition switch is set to “HEAD” position while igniter is not connected to discharge headlight bulb
• Discharge headlight does not light up even when lighting switch is set to “HEAD” position.
• Ballast detects a short in the circuit between discharge headlight bulb and ballast when lighting switch is at “HEAD”

position.

I5JB0A920002-01

I5JB0A920001-01

9B-3 Lighting Systems:

Auto Leveling Headlight System Description (If Equipped)

S6JB0B9201002

Auto Leveling Headlight System adjusts the optical axis of the headlight automatically to be suitable for the varied
vehicle position while the headlights are lit. It consists of front height sensor (1), rear height sensor (2), headlight
leveling control module (3), headlight leveling actuator (4) and headlight leveling warning light (5).

With more passenger(s) or luggage in the vehicle, the vehicle position differs from that in such vehicle state with one
person and no load in the vehicle and angle of the headlight optical axis varies accordingly. This system automatically
adjusts the varied angle to maintain the optical axis properly.

I5JB0A920036-02

[A]

[B]

I5JB0A920004-01

[A]: Optical axis of headlight in standard position
[B]: Corrected optical axis of headlight

Lighting Systems: 9B-4

Front and Rear Height Sensors
Height sensor (1) is installed to the front and rear suspension frames respectively and connected to the lower arm (4)
with the link (3). Each height sensor converts vertical movement of the lower arm into the resistance value and outputs
the detected change in the vehicle position as a voltage signal to the headlight leveling control module.

Headlight Leveling Control Module
Headlight leveling control module is installed at the foot of the front passenger seat. It uses the headlight ON signal
from the lighting switch, vehicle speed signal from BCM and vehicle position signal from height sensors to calculate
the angle of the headlight optical axis to be corrected. Then it adjusts the optical axis angle of headlight based on the
calculated angle value by driving the headlight leveling actuator so that proper headlight aiming is obtained. Also,
when any abnormality is detected in the system, the headlight leveling control module makes the headlight leveling
warning light in the combination meter light up to warn the driver of an abnormality in the system.

Fail-safe Function of Headlight Leveling Control Module
Headlight leveling control module has a fail-safe function which operates as follows.

[A]

[B]

I5JB0A920005-01

[A]: Front

[B]: Rear

Detecting condition

Fail-safe operation

Warning light

Power voltage supplied to headlight leveling control
module is higher than 18.5 V