2006 SUZUKI SX4 Headlight

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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

Downloaded from www.Manualslib.com manuals search engine 9B-5 Lighting Systems:
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

Downloaded from www.Manualslib.com manuals search engine 9B-7 Lighting Systems:
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)

Downloaded from www.Manualslib.com manuals search engine Lighting Systems: 9B-8
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.

Downloaded from www.Manualslib.com manuals search engine 9B-9 Lighting Systems:
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)”.

Downloaded from www.Manualslib.com manuals search engine Lighting Systems: 9B-10
DRL System Symptom Diagnosis (If Equipped)S6RW0D9204002
Headlight Auto Leveling System Symptom Diagnosis (If Equipped)S6RW0D9204019
Headlight Manual Leveling System Symptom Diagnosis (If Equipped)S6RW0D9204003
Condition Possible cause Correction / Reference Item
Headlight does not light
when lighting switch is in
OFF position and engine
is runningLighting switch faultyCheck lighting switch referring to “Headlight
Switch (in Lighting Switch) Inspection”.
Oil pressure switch faultyCheck oil pressure switch referring to “Oil
Pressure Switch Inspection in Section 9C”.
DRL controller faultyCheck lighting switch referring to “Inspection of
DRL Controller and Its Circuits (If Equipped)”.
Wiring or grounding faultyRepair circuit.
Headlight lights even if
engine stop and lighting
switch is OFF positionLighting switch faultyCheck system referring to “Headlight Switch (in
Lighting Switch) Inspection”.
Oil pressure switch faultyCheck oil pressure switch referring to “Oil
Pressure Switch Inspection in Section 9C”.
DRL controller faultyCheck system referring to “Inspection of DRL
Controller and Its Circuits (If Equipped)”.
Wiring or grounding faultyRepair circuit.
Condition Possible cause Correction / Reference Item
Headlight leveling
warning light comes on
steadyHeight sensor faultyCheck height sensor referring to “Height
Sensor and Its Circuit Inspection (If
Equipped)”.
Wiring or ground faultyRepair circuit.
Headlight leveling control module faultyCheck headlight leveling control module for
function referring to “Inspection of Headlight
Leveling Control Module and Its Circuit
(Headlight Auto Leveling System)”.
Optical axes of both
headlights do not changeCircuit fuse blownReplace fuse and check for short circuit.
Supply voltage too low or too highCheck charging system referring to “Generator
Test (Undercharged Battery Check) in Section
1J” or “Generator Test (Overcharged Battery
Check) in Section 1J”.
Wiring or ground faultyRepair circuit.
Headlight leveling control module faultyCheck headlight leveling control module for
function referring to “Inspection of Headlight
Leveling Control Module and Its Circuit
(Headlight Auto Leveling System)”.
Optical axis of only one
headlight does not
changeHeadlight levering actuator faultyCheck actuator referring to “Headlight Leveling
Actuator Inspection (If Equipped)”.
Headlight housing deformedReplace headlight housing.
Wiring or ground faultyRepair circuit.
Condition Possible cause Correction / Reference Item
Optical axes of both
headlights do not changeCircuit fuse blownReplace fuse and check for short circuit.
Headlight leveling switch faultyCheck headlight leveling switch referring to
“Headlight Manual Levering Switch Inspection
(If Equipped)”.
Supply voltage too lowCheck charging system referring to “Generator
Test (Undercharged Battery Check) in Section
1J”.
Wiring or grounding faultyRepair circuit.
Optical axis of only one
headlight does not
changeCircuit fuse blownReplace fuse and check for short circuit.
Headlight leveling actuator faultyCheck actuator referring to “Headlight Leveling
Actuator Inspection (If Equipped)”.
Headlight housing deformedReplace headlight housing.
Wiring or grounding faultyRepair circuit.

Downloaded from www.Manualslib.com manuals search engine 9B-11 Lighting Systems:
Turn Signal and Hazard Warning Light Symptom DiagnosisS6RW0D9204004
Clearance, Tail and License Plate Light Symptom DiagnosisS6RW0D9204005
Condition Possible cause Correction / Reference Item
Flash rate high or one
side only flashesBulb blown on “flash rate high”-sideReplace bulb.
Incorrect bulbReplace bulb.
Turn signal / hazard warning relay faultyCheck turn signal / hazard warning relay
referring to “Turn Signal and Hazard Warning
Relay Inspection”.
Open circuit or high resistance existing
either; between turn signal switch and
non lighting bulb, or between hazard
warning switch and non lighting bulbRepair circuit.
Wiring or grounding faultyRepair circuit.
No flashing
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.

Circuit fuse(s) blownReplace fuse(s) and check for short circuit.
Turn signal / hazard warning relay faultyCheck turn signal / hazard warning relay
referring to “Turn Signal and Hazard Warning
Relay Inspection”.
Turn signal light switch faultyCheck turn signal light switch referring to “Turn
Signal Light Switch (in Lighting Switch)
Inspection”.
Hazard warning switch faultyCheck hazard warning switch referring to
“Hazard Warning Switch Inspection”.
Open circuit or high resistance existing
between battery and switchRepair circuit.
Wiring or grounding faultyRepair circuit.
BCM faultyReplace after making sure that none of above
parts is faulty.
Flash rate lowSupply voltage lowCheck charging system referring to “Generator
Test (Undercharged Battery Check) in Section
1J”.
Turn signal / hazard warning relay faultyCheck turn signal / hazard warning relay
referring to “Turn Signal and Hazard Warning
Relay Inspection”.
Condition Possible cause Correction / Reference Item
All lights do not light upCircuit fuse blownReplace fuse and check for short circuit.
Tail light relay faulty (if equipped)Check tail light relay referring to “Tail Light
Relay, Headlight Relay, Front Fog Light Relay
Inspection (If Equipped)”.
Lighting and dimmer switch faultyCheck lighting and dimmer switch referring to
“Headlight Switch (in Lighting Switch)
Inspection”.
Wiring or grounding faultyRepair circuit.
Some lights do not light
upBulb(s) blownReplace bulb(s).
Wiring or grounding faultyRepair circuit.

Downloaded from www.Manualslib.com manuals search engine Lighting Systems: 9B-12
Back-Up Light Symptom DiagnosisS6RW0D9204020
Brake Light Symptom DiagnosisS6RW0D9204007
Front Fog Light Symptom Diagnosis (If Equipped)S6RW0D9204008
Rear Fog Light Symptom Diagnosis (If Equipped)S6RW0D9204009
Condition Possible cause Correction / Reference Item
Back-up lights do not
light upBulb(s) blownReplace bulb(s).
Circuit fuse blownReplace fuse and check for short circuit.
Back-up light switch (M/T model) or
transmission range sensor (A/T model)
faultyCheck back-up light switch or transmission
range sensor referring to “Back Up Light
Switch Inspection in Section 5B” or
“Transmission Range Sensor Inspection and
Adjustment in Section 5A”.
Wiring or grounding faultyRepair circuit.
Back-up lights stay onBack-up light switch (M/T model) or
transmission range sensor (A/T model)
faultyCheck back-up light switch or transmission
range sensor referring to “Back Up Light
Switch Inspection in Section 5B” or
“Transmission Range Sensor Inspection and
Adjustment in Section 5A”.
Condition Possible cause Correction / Reference Item
Brake light do not light upBulb(s) blownReplace bulb(s).
Circuit fuse blownReplace fuse and check for short circuit.
Brake light switch faultyCheck brake light switch referring to “Brake
Light Switch Inspection”.
Wiring or grounding faultyRepair circuit.
Brake light stay onBrake light switch faultyCheck 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
lightBulb blownReplace bulb.
Wiring or grounding faultyRepair circuit.
Front fog lights do not
lightCircuit fuse blownReplace fuse and check for short circuit.
Bulb blownReplace bulb.
Front fog light switch faultyCheck front fog light switch referring to “Front
Fog Light Switch Inspection (If Equipped)”.
Front fog light relay faultyCheck front fog light relay referring to “Tail
Light Relay, Headlight Relay, Front Fog Light
Relay Inspection (If Equipped)”.
Wiring or grounding faultyRepair circuit.
Condition Possible cause Correction / Reference Item
Rear fog light do not lightCircuit fuse blownReplace fuse and check for short circuit.
Bulb blownReplace bulb.
Rear fog light switch faultyCheck rear fog light switch referring to “Rear
Fog Light Switch Inspection (If Equipped)”.
Wiring or grounding faultyRepair circuit.