Suzuki 2006 SX4 Service Manual page 1322

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9B-3 Lighting Systems:

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.

Front and rear height sensors

Front height sensor (1) is installed to the front suspension frame (2) respectively and connected to the lower arm (4)

with the link (3). Also rear height sensor is installed to the rear floor center cross member (5) respectively and

connected to the rear axle (6) 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 inside of the glove box. 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.

Detecting condition

Power voltage supplied to headlight

leveling control module is higher than

Power voltage supplied to headlight

leveling control module is lower than 9V

Vehicle speed is 180km/h or higher

[A]: Optical axis of headlight in standard position

[B]: Corrected optical axis of headlight

Fail-safe operation

Stops headlight leveling actuator operation.

I6RW0C920003-01

I6RW0C920004-01

Warning light

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