Suzuki Grand Vitara JB416 / JB420. Manual - part 366

9B-3 Lighting Systems: 

Auto Leveling Headlight System Description (If Equipped)

S5JB0A9201002

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.

4

2

1

5

3

I5JB0A920036-02

[A]

[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.

2

3

1

[A]

[B]

4

2

3

1

4

I5JB0A920005-01

[A]: Front

[B]: Rear

Detecting condition

Fail-safe operation

Warning light

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

Stops headlight leveling actuator operation.

OFF

Power voltage supplied to headlight leveling control 
module is lower than 9V

Stops headlight leveling actuator operation.

OFF

Vehicle speed is 180km/h or higher

Stops headlight leveling actuator operation.

OFF

Voltage supplied to height sensor is lower than 4.6V

Stops headlight leveling actuator operation.

ON

Signal voltage from height sensor is higher than 4.75V or 
lower than 0.25V

Stops headlight leveling actuator operation.

ON

Abnormality in headlight leveling control module is 
detected

Resets microcomputer in headlight leveling 
control module.

ON

Correction value calculated by headlight leveling control 
module exceeds operation range of headlight leveling 
actuator

Drives headlight leveling actuator within its 
operation range.

OFF

9B-5 Lighting Systems: 

Headlight leveling actuator
Headlight leveling actuator is (1) located in the headlight housing (2). It moves the reflector (3) in the headlight housing 
according to the drive signal from the headlight leveling control module so as to adjust the optical axis of the headlight 
to the angle calculated by the headlight leveling control module.

Auto-On Headlight System Description (If Equipped)

S5JB0A9201003

The auto-on headlight is controlled by BCM (1) and works as follows.Under such conditions as the ignition switch 
turned ON, the lighting switch (2) turned to the “AUTO” position and the parking brake released, when illuminance to 
the auto-on headlight sensor (3) becomes lower than the specified value, the headlights and clearance lights are 
turned ON by BCM. On the other hand, when illuminance to the auto-on headlight sensor becomes higher than the 
specified value under the same conditions, the headlights and clearance lights are turned OFF by BCM.

I5JB0A920006-06

1

1

2

3

I5JB0A920007-01

Lighting Systems:  9B-6

D.R.L. System Description (If Equipped)

S5JB0A9201004

The D.R.L. system is controlled by BCM (1). It lights headlights when following two conditions are met.Conditions for 
D.R.L. operation:
• The engine is running
• The lighting switch is at “OFF” position

Schematic and Routing Diagram

Headlight Auto Leveling System wiring Circuit Diagram

S5JB0A9202001

1

1

I5JB0A920008-01

G51-12
G51-19
G51-21

G51-10

G51-23

+B

5V

5V

YEL/RED

GRN/RED

BLK

G51-1

12V

GRN

GRN/YEL

GRN/WHT

YEL

3

G51-13
G51-20
G51-22

5V

BLU/RED
BLU/YEL
BLU/BLK

2

4

5

9

10

11

1

5V

5V

12V

G51-16

G51-3

BLU/BLK

RED/BLU

5V

G51-5 RED/BLU

G51-17

RED

G51-11

G51-24

YEL/GRN

GRN/BLK

6

12V

G51-18

GRN

8

G51-6

G51-9

BLU/WHT

G51

10

11

12

13

16

17

18

19

20

3

1

5

6

9

21

22

23

24

[A]

I5JB0A920011-02

[A]: Headlight leveling control module connector 

(viewed from harness side)

4. BCM

8. Headlight leveling warning light

1. Headlight leveling control module

5. Right headlight leveling actuator

9. Ignition switch

2. Front height sensor

6. Left headlight leveling actuator

10. Lighting switch

3. Rear height sensor

7. Combination meter

11. Diagnosis connector