2006 SUZUKI SX4 light

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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 20,000V 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 (3) and
metal iodide (2) 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.
Headlight Auto Leveling System Description (If Equipped)S6RW0D9201002
Headlight Auto Leveling 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).
123
44
I5JB0A920001-01
4
3
5
1
2
I6RW0C920002-01

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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.
[A]
[A]
[B]
I6RW0C920003-01
[A]: Optical axis of headlight in standard position
[B]: Corrected optical axis of headlight
1
5
[A] [B]
6
3
1
2
3
4I6RW0C920004-01
[A]: Front [B]: Rear
Detecting condition Fail-safe operation Warning light
Power voltage supplied to headlight
leveling control module is higher than
18.5VStops headlight leveling actuator operation. OFF
Power voltage supplied to headlight
leveling control module is lower than 9VStops headlight leveling actuator operation. OFF
Vehicle speed is 180km/h or higher Stops headlight leveling actuator operation. OFF

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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)S6RW0D9201003
The auto-on headlight is controlled by auto-on headlight controller (1) and works as follows.Under such conditions as
the ignition switch turned ON and the lighting switch (2) turned to the “AUTO” position, when illuminance to the auto-on
headlight sensor (3) becomes lower than the specified value, the headlights and clearance lights are turned ON by
auto-on headlight controller. 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 auto-on
headlight controller.Voltage supplied to height sensor is lower
than 4.6VStops headlight leveling actuator operation. ON
Signal voltage from height sensor is higher
than 4.75V or lower than 0.25VStops headlight leveling actuator operation. ON
Abnormality in headlight leveling control
module is detectedResets microcomputer in headlight leveling
control module.ON
Correction value calculated by headlight
leveling control module exceeds operation
range of headlight leveling actuatorDrives headlight leveling actuator within its
operation range.OFF Detecting condition Fail-safe operation Warning light
1
3
2
I6RW0C920005-01
1 3
2
1
I6RW0C920006-01

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Schematic and Routing Diagram
Headlight Auto Leveling System Wiring Circuit DiagramS6RW0D9202001
G14-12G14-19G14-21
G14-10
G14-23
+B
5V
5V
GRN/YEL
GRY/RED
BLK
G14-112V
BRNLT BLUGRY
RED/BLK
3
G14-13G14-20G14-22
5V
PNKBLUYEL/GRN2
45
9
10 11 1
5V
5V
12V
G14-16
G14-3
PPL
GRN/ORN
5V
G14-5YEL
G14-17GRN
G14-11
G14-24
ORN
WHT6 12VG14-18LT GRN
7
8
G14-6
G14-9
RED/WHT
G14
10 11 12 13 16 17 18 19 205 6 9
21 22 23 24
[A]
I6RW0C920007-01
[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

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Component Location
Lighting System Components LocationS6RW0D9203001
NOTE
Below figure shows left-hand steering vehicle. For right-hand steering vehicle, parts with (*) are
installed at the opposite side.

10
119
[D]25*30
21
27*26*29
31*20*
13
4
2
4
[A]
[B]
8
132
7 5
6
12
13
22
28*
15
16
[A]
17
18
19
15
16
17
18 [C]
14
23* 24*
I6RW0C920008-01

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Interior Light System LocationS6RW0D9203002
Diagnostic Information and Procedures
Self-Diagnosis Function for Headlight Auto Leveling SystemS6RW0D9204014
The headlight leveling control module has self-diagnosis function to monitor the system components and circuits while
the headlight auto leveling system is at work. When the headlight leveling control module detects an abnormality in the
system, the headlight leveling warning light in the combination meter turns ON. However, the headlight leveling control
module does not have a function to indicate location of such abnormality.
[A]: Discharge headlight model 9. Front fog light (if equipped) 21. Turn signal / hazard warning relay
[B]: Other than discharge headlight model 10. Rear combination light 22. Tail light relay (junction block without BCM
type)
[C]: Junction block without BCM type 11. Rear fog light (if equipped) 23. BCM (junction block without BCM type)
[D]: Junction block viewed from relay side 12. Rear height sensor (if equipped) 24. Auto-on headlight controller (if equipped)
1. Headlight bulb 13. Front height sensor (if equipped) 25. Front fog light switch (if equipped)
2. Clearance light 14. Front fog light relay (if equipped) 26. Headlight manual leveling switch (if
equipped)
3. Turn signal light 15. Headlight high beam relay (left side) 27. Illumination cancel switch (if equipped)
4. Headlight unit 16. Headlight high beam relay (right side) 28. Lighting switch
5. Discharge headlight bulb 17. Headlight low beam relay (left side) 29. Rear fog light switch (if equipped)
6. Igniter 18. Headlight low beam relay (right side) 30. Hazard warning switch
7. Ballast 19. Tail light relay 31. DRL controller or headlight leveling control
module (if equipped)
8. Auto-on headlight sensor (if equipped) 20. BCM (junction block with BCM type)
: BCM cannot be removed from junction
block.
3 4
5
2
1
I7RW01920003-01
1. Dome light 3. Door switches (both sides) 5. Spot light
2. Luggage compartment light (if equipped) 4. Rear end door switch (included in lock assembly)

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Headlight Leveling Warning Light CheckS6RW0D9204015
1) Turn ignition switch to ON position.
2) Check that headlight leveling warning light (1) lights for about 2 seconds and then goes OFF. If the headlight
leveling warning light lights up again 10 seconds after it turned off, go to “Headlight Auto Leveling System
Symptom Diagnosis (If Equipped)”. If headlight leveling warning light flashes, go to “Initialization of Headlight Auto
Leveling System”.
Headlight Symptom Diagnosis (Discharge Headlight Model)S6RW0D9204016
1
I6RW0C920009-01
Condition Possible cause Correction / Reference Item
Only one low beam does
not light upCircuit fuse blownReplace fuse and check for short circuit.
Headlight low beam relay faultyCheck headlight relay referring to “Tail Light
Relay, Headlight Relay, Front Fog Light Relay
Inspection (If Equipped)”.
Bulb faultyReplace bulb.
Igniter faultyReplace igniter.
Ballast faultyReplace ballast.
Wiring or ground faultyRepair circuit.
Low beam does not light
upCircuit fuses blownReplace fuses and check for short circuit.
Headlight low beam relay faultyCheck headlight relay referring to “Tail Light
Relay, Headlight Relay, Front Fog Light Relay
Inspection (If Equipped)”.
Lighting or dimmer switch faultyCheck lighting and dimmer switch referring to
“Headlight Switch (in Lighting Switch)
Inspection”.
Bulbs faultyReplace bulbs.
Igniters faultyReplace igniters.
Ballasts faultyReplace ballasts.
Wiring or ground faultyRepair circuit.
Only one high beam does
not light upCircuit fuse blownReplace fuse and check for short circuit.
Headlight high beam relay faultyCheck headlight relay referring to “Tail Light
Relay, Headlight Relay, Front Fog Light Relay
Inspection (If Equipped)”.
Bulb blownReplace bulb.
Wiring or ground faultyRepair circuit.
High beam does not light
upCircuit fuses blownReplace fuses and check for short circuit.
Headlight high beam relay faultyCheck headlight relay referring to “Tail Light
Relay, Headlight Relay, Front Fog Light Relay
Inspection (If Equipped)”.
Lighting or dimmer switch faultyCheck lighting and dimmer switch referring to
“Headlight Switch (in Lighting Switch)
Inspection”.
Bulbs blownReplace bulbs.
Wiring or ground faultyRepair circuit.

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Headlight Symptom diagnosis (Other than Discharge Headlight Model)S6RW0D9204017
Auto-On Headlight System Symptom Diagnosis (If Equipped)S6RW0D9204018
Condition Possible cause Correction / Reference Item
Only one low beam does
not light upCircuit fuse blownReplace fuse and check for short circuit.
Bulb blownReplace bulb.
Headlight low beam relay faulty (if
equipped)Check headlight relay referring to “Tail Light
Relay, Headlight Relay, Front Fog Light Relay
Inspection (If Equipped)”.
Wiring or ground faultyRepair circuit.
Low beam does not light
upCircuit fuse blownReplace fuses and check for short circuit.
Headlight low beam relay faulty (if
equipped)Check headlight relay referring to “Tail Light
Relay, Headlight Relay, Front Fog Light Relay
Inspection (If Equipped)”.
Lighting or dimmer switch faultyCheck lighting and dimmer switch referring to
“Headlight Switch (in Lighting Switch)
Inspection”.
Bulbs blownReplace bulbs.
Wiring or ground faultyRepair circuit.
DRL controller faulty (if equipped)Check system referring to “Inspection of DRL
Controller and Its Circuits (If Equipped)”.
Only one high beam does
not light upCircuit fuse blownReplace fuse and check for short circuit.
Bulb blownReplace bulb.
Headlight high beam relay faulty (if
equipped)Check headlight relay referring to “Tail Light
Relay, Headlight Relay, Front Fog Light Relay
Inspection (If Equipped)”.
Wiring or ground faultyRepair circuit.
High beam does not light
upCircuit fuse blownReplace fuses and check for short circuit.
Headlight high beam relay faulty (if
equipped)Check headlight relay referring to “Tail Light
Relay, Headlight Relay, Front Fog Light Relay
Inspection (If Equipped)”.
Lighting or dimmer switch faultyCheck lighting and dimmer switch referring to
“Headlight Switch (in Lighting Switch)
Inspection”.
Bulbs blownReplace bulbs.
Wiring or ground faultyRepair circuit.
Condition Possible cause Correction / Reference Item
Headlights are not turned
ON or OFF automatically
even after darkened or
lightenedCircuit fuse blownReplace fuse and check for short circuit.
Lighting or dimmer switch faultyCheck lighting and dimmer switch referring to
“Headlight Switch (in Lighting Switch)
Inspection”.
Auto-on headlight sensor faultyCheck auto-on headlight sensor referring to
“Auto-On Headlight Sensor Inspection (If
Equipped)”.
Wiring or ground faultyRepair circuit.
Auto-on headlight controller faultyCheck auto-on headlight controller for function
referring to “Inspection of Auto-On Headlight
Controller and Its Circuit (If Equipped)”.