2006 SUZUKI SX4 Ignition switch

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Inspection of Headlight Leveling Control Module and Its Circuit (Headlight Auto Leveling System)S6RW0D9204023
Headlight auto leveling control module and its circuits can be checked at headlight auto leveling control module wiring
couplers by measuring voltage and pulse signal.
CAUTION!
Headlight auto leveling control module cannot be checked by itself. It is strictly prohibited to connect
voltmeter or ohmmeter to headlight auto leveling control module with couplers disconnected from it.

Voltage Check
Check voltage between each terminal of headlight auto leveling control module and vehicle body ground under each
condition. If measured voltage is out of standard value, check circuit (including switch and sensor) of terminal where
voltage was measured.
NOTE
• As each terminal voltage is affected by the battery voltage, confirm that it is 11 V or more when
ignition switch is ON.
• Voltage with asterisk (*) cannot be measured by voltmeter because it is pulse signal. Check it with
oscilloscope if necessary.

4Auto-on headlight sensor
signal3 – 4.5 VLight the sensor lens with
incandescent lamp 100 W
Less than 1 VCover the sensor lens with
hand.
5Ground for auto-on headlight
controller0 V —
6Ground for auto-on headlight
sensor0 V —
7 Lighting switch signal0 VIgnition switch is at ON
position, lighting switch at
“AUTO” position.
1.0 – 5.0 VIgnition switch is at ON
position, lighting switch at other
than “AUTO” position.
8 Ignition switch signal 10 – 14 VIgnition switch is at ON
position. Terminal Circuit Specification Condition
V
10 11 12 13 16 17 18 19 2031 5 6 9
21 22 23 24
[A]
I6RW0C920012-01
[A]: Headlight leveling control module connector (viewed from harness side)

Downloaded from www.Manualslib.com manuals search engine 9B-17 Lighting Systems:
Terminal Circuit Specification Condition
1 Power source 10 – 14 VIgnition switch is at ON
position.
2———
3 Lighting switchLess than 1.5 VLighting switch is at “HEAD”
position.
10 – 14 VLighting switch is at OFF
position.
4———
5 Diagnosis switch terminal About 5 VIgnition switch is at ON
position.
6Headlight auto leveling
indicatorLess than 1.5 VFor about 3 seconds after
ignition switch is turned on (i.e.,
headlight auto leveling
indicator is lit up).
10 – 14 VMore than about 3 seconds
after ignition switch is turned
on (i.e., headlight auto leveling
indicator is not lit up).
7———
8———
9Ground for headlight auto
leveling control unit0 VIgnition switch is at ON
position.
10Power supply for right
headlight leveling actuator10 – 14 VIgnition switch is at ON
position.
11Power supply for left headlight
leveling actuator10 – 14 VIgnition switch is at ON
position.
12Power supply for rear height
sensorAbout 5 VIgnition switch is at ON
position.
13Power supply for front height
sensorAbout 5 VIgnition switch is at ON
position.
14———
15———
16 Vehicle speed signal Refer to “Reference waveform No.1: ”.
17Signal for right headlight
leveling actuatorLess than 1 VLighting switch is at OFF
position.
1.0 – 12.6 VFor 17 seconds after turning
lighting switch to ON position.
18Signal for left headlight leveling
actuatorLess than 1 VLighting switch is at OFF
position.
1.0 – 12.6 VFor 17 seconds after turning
lighting switch to ON position.
19Input signal for rear height
sensorAbout 2.5 VIgnition switch is at ON
position.
20Input signal for front height
sensorAbout 2.5 VIgnition switch is at ON
position.
21 Ground for rear height sensor 0 VIgnition switch is at ON
position.
22 Ground for front height sensor 0 VIgnition switch is at ON
position.
23Ground for right headlight
leveling actuator0 VIgnition switch is at ON
position.
24
Ground for left headlight
leveling actuator0 VIgnition switch is at ON
position.

Downloaded from www.Manualslib.com manuals search engine Lighting Systems: 9B-20
Igniter Removal and Installation (Discharge
Headlight Model)
S6RW0D9206024
WARNING!
Be sure to read “Precautions for Discharge
Headlight Service (If Equipped)” carefully
before working. Neglecting them may result
in personal injury.

Removal
1) Remove ballast referring to “Ballast Removal and
Installation (Discharge Headlight Model)”.
2) Remove cover (1) from headlight housing by turning
it counterclockwise.
3) Remove igniter (2) from discharge headlight bulb by
turning it counterclockwise.
4) After disconnecting ground wire (3), pull out igniter
(2) from headlight housing.Installation
Reverse removal procedure noting the following.
• Connect connectors securely.
• After installation, be sure to inspect and adjust aiming
referring to “Headlight Aiming Adjustment with
Screen”.
Headlight Aiming Adjustment with ScreenS6RW0D9206003
NOTE
• Unless otherwise obligated by local regulations, adjust headlight aiming according to the following
procedure.
• After replacing headlight housing, be sure to adjust aiming.
• When inspecting and adjusting headlight with leveling system, make sure to set the leveling switch
to “0” position with ignition switch turned ON.

1) Make sure the following items.
• Place vehicle on a flat surface in front of blank wall (screen) (1) ahead of headlight surface.
Distance “a”
10 m (32.8 ft.)
• Adjust air pressure of all tires to the specified value respectively.
• Bounce vehicle body up and down by hand to stabilize suspension.
• Carry out aiming with a driver aboard.
Driver’s weight
75 kg (165 lb)
2) Check to see if hot spot (high intensity zone) of each low beam axis falls as shown in figure.
NOTE
If the headlights interfere each other and make it hard to see the cut line clearly, cover the headlight on
one side. This helps to make aiming adjustment easier.

Hot spot specification
Angle “b”: 0.75° (Specification)
Calculated distance “H”: Approx. 130 mm (5.15 in.)
3) Align headlight aiming to specification by adjusting aiming gear if it is not set properly.
2
1 3
I6RW0C920017-01

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Headlight Manual Levering Switch Inspection (If
Equipped)
S6RW0D9206019
Check for resistance between terminals at each switch
position.
If check result is not as specified, replace switch.
Headlight Leveling Actuator Inspection (If
Equipped)
S6RW0D9206026
Headlight auto leveling system
1) Make sure all couplers of headlight and leveling
actuator are connected securely.
2) Park vehicle in front of blank wall (screen).
3) Turn ignition switch to ON position.
4) Perform “Headlight Leveling Warning Light Check”.
5) Connect service wire (2) to terminals of diagnosis
connector (1).
6) Perform Steps a) through c) described below within
20 seconds after Step 5).
a) Turn lighting switch (3) to “HEAD” position and
then turn lighting switch to OFF position.
b) Repeat Step a) 2 times.
c) Turn lighting switch (3) to “HEAD” position.
7) Check that optical axes of headlights reflected on
blank wall (screen) change. If not, go to “Headlight
Auto Leveling System Symptom Diagnosis (If
Equipped)”.
Headlight manual leveling system
1) Make sure all couplers of headlight and leveling
actuator are connected securely.
2) Park vehicle in front of blank wall (screen).
3) Turn ignition switch to ON position.
4) Turn lighting switch to “HEAD” position.
5) Move headlight leveling switch and check that
optical axes of headlights reflected on blank wall
(screen) change then. Also check that leveling
actuator sounds slightly while moving leveling
switch. If optical axes do not change, go to
“Headlight Manual Leveling System Symptom
Diagnosis (If Equipped)”.
1
2
3
Switch Position
0Terminal Resistance ( )
-
1
2
3
41 and 24370 - 4830
1 and 3
2 and 3
1 and 3
2 and 3
1 and 3
2 and 3
1 and 3
2 and 3
1 and 3
2 and 3646 - 714
3724 - 4116
3078 - 3402 1292 - 1428
1938 - 2142
2584 - 2856
3230 - 3570 2432 - 2688
1786 - 1974
1140 - 1260
I4RS0B920012-01
3
1
2
I6RW0C920021-01

Downloaded from www.Manualslib.com manuals search engine 9B-31 Lighting Systems:
Without initialization of the headlight auto leveling
system, it is not possible to obtain its proper function.
Also, if the headlight auto leveling system is not
initialized after replacing the headlight leveling control
module, the headlight leveling warning light in the
combination meter flashes.
1) Observe the following instructions.
• Park vehicle on level ground.
• Adjust air pressure of all tires to the specified
value respectively.
• Bounce vehicle body up and down by hand to
stabilize suspension.
2) Turn ignition switch to ON position.
3) Perform “Headlight Leveling Warning Light Check”.
4) Connect service wire (2) to terminals of diagnosis
connector (1).
5) Perform Steps a) through b) described blow within
20 seconds after Step 4).
a) Turn lighting switch (3) to “HEAD” position and
then turn lighting switch to OFF position.
b) Repeat Step a) 2 times.
6) Confirm that headlight leveling warning light flashes
3 times and turns off, which indicates that system
initialization was completed properly. If it does not
turn off after flashing 3 times, it means initialization
was not successful. In such case, turn off ignition
switch and perform Steps 1) to 6) again.Auto-On Headlight Sensor Inspection (If
Equipped)
S6RW0D9206031
1) Disconnect negative (–) cable at battery.
2) Remove auto-on headlight sensor (1) located on the
passenger side of the dashboard (2). Be careful not
to damage the sensor (1) and dashboard by using
rag (3).
3) Measure voltage between white wire terminal and
black wire terminal at the following condition.
If measured voltage is out of specification, replace
sensor.
Auto-on headlight sensor voltage specifications
Cover the sensor lens with hand: 0.4 V
Light the sensor lens with incandescent lamp
100 W: 3 – 4.5 V3
1
2
I6RW0C920021-01
1
I6RW0C920009-01
2
1
3I5JB0A920038-01
I5JB0A920039-01

Downloaded from www.Manualslib.com manuals search engine Instrumentation / Driver Info. / Horn: 9C-7
Low Fuel Warning Light Symptom DiagnosisS6RW0D9304005
NOTE
• Confirm that fuel meter is in good condition before referring to the following possible causes.
• When fuel level sensor circuit is open or short, fuel level meter indicates empty even if fuel tank
does not empty.
• The low fuel warning light comes ON when fuel level is lower than specification below.

Low fuel warning light operation:
Oil Pressure Warning Light Symptom DiagnosisS6RW0D9304006
Low fuel warning light operation: Fuel amount: Resistance of fuel level sensor:
ON (2WD) Approx. 7.5 liter Approx. 261 Ω
ON (4WD) Approx. 6.8 liter Approx. 261 Ω
Condition Possible cause Correction / Reference Item
Low fuel warning light
does not come ON when
fuel level is lower than
specificationCircuit fuse blownReplace fuse and check for short circuit.
Fuel level sensor faultyCheck fuel level sensor referring to “Fuel Level
Sensor Inspection”.
Wiring or grounding faultyRepair circuit.
Combination meter faultyReplace combination meter.
ECM faultyReplace after making sure that none of above
parts is faulty.
Low fuel warning light
comes ON steadyLow fuelRefill fuel.
Fuel level sensor faultyCheck fuel level sensor referring to “Fuel Level
Sensor Inspection”.
Wiring or grounding faultyRepair circuit.
Combination meter faultyReplace combination meter.
ECM faultyReplace after making sure that none of above
parts is faulty.
Condition Possible cause Correction / Reference Item
Oil pressure warning light
does not light up when
ignition switch is turned
to ON position at engine
offCircuit fuse blownReplace fuse and check for short circuit.
Oil pressure switch faultyCheck oil pressure switch referring to “Oil
Pressure Switch Inspection”.
Wiring or grounding faultyRepair circuit.
Combination meter faultyReplace combination meter.
BCM faultyReplace after making sure that none of above
parts is faulty.
Oil pressure warning light
stays ONOil pressure switch faultyCheck oil pressure switch referring to “Oil
Pressure Switch Inspection”.
Wiring or grounding faultyRepair circuit.
Combination meter faultyReplace combination meter.
BCM faultyReplace after making sure that none of above
parts is faulty.

Downloaded from www.Manualslib.com manuals search engine 9C-8 Instrumentation / Driver Info. / Horn:
Brake and Parking Brake Warning Light Symptom DiagnosisS6RW0D9304007
Seat Belt Reminder Light Symptom DiagnosisS6RW0D9304008
A/T Shift Position Indicator Symptom Diagnosis (A/T Model)S6RW0D9304009
Condition Possible cause Correction / Reference Item
Brake warning light does
not light up when brake
fluid level is low or
parking brake is pulled up
or for 5 seconds after
turning ON ignition switchCircuit fuse blownReplace fuse and check for short circuit.
Brake fluid level switch faultyCheck brake fluid level switch referring to
“Brake Fluid Level Switch Inspection”.
Parking brake switch faultyCheck parking brake switch referring to
“Parking Brake Switch Inspection”.
ABS system faultyRefer to “ABS Check in Section 4E”.
Wiring or grounding faultyRepair circuit.
Combination meter faultyReplace combination meter.
BCM faultyReplace after making sure that none of above
parts is faulty.
Brake warning light stays
ONBrake fluid level switch faultyCheck brake fluid level switch referring to
“Brake Fluid Level Switch Inspection”.
Parking brake switch faultyCheck parking brake switch referring to
“Parking Brake Switch Inspection”.
EBD system faultyRefer to “EBD Warning Light (Brake Warning
Light) Check in Section 4E”.
Wiring or grounding faultyRepair circuit.
Combination meter faultyReplace combination meter.
BCM faultyReplace after making sure that none of above
parts is faulty.
Condition Possible cause Correction / Reference Item
Seat belt reminder light
does not light upCircuit fuse blownReplace fuse and check for short circuit.
Seat belt switch faultyCheck seat belt switch referring to “Front Seat
Belt Inspection in Section 8A”.
Wiring or grounding faultyRepair circuit.
Combination meter faultyReplace combination meter.
BCM faultyReplace after making sure that none of above
parts is faulty.
Seat belt reminder light
stays ONSeat belt switch faultyCheck seat belt switch referring to “Front Seat
Belt Inspection in Section 8A”.
Wiring or grounding faultyRepair circuit.
Combination meter faultyReplace combination meter.
BCM faultyReplace after making sure that none of above
parts is faulty.
Condition Possible cause Correction / Reference Item
All A/T shift position
indicator does not light upCircuit fuse blownReplace fuse and check for short circuit.
Transmission range sensor (shift switch)
faultyCheck transmission range sensor referring to
“Transmission Range Sensor Inspection and
Adjustment in Section 5A”.
Wiring or ground faultyRepair circuit.
Combination meter faultyReplace combination meter.
TCM faultyReplace after making sure that none of above
parts is faulty.

Downloaded from www.Manualslib.com manuals search engine Instrumentation / Driver Info. / Horn: 9C-9
Charge Warning Light Symptom DiagnosisS6RW0D9304010
Main Beam (High Beam) Indicator Symptom DiagnosisS6RW0D9304011
Warning Buzzer Circuit Symptom DiagnosisS6RW0D9304012
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.

Condition Possible cause Correction / Reference Item
Charge warning light
does not come ONCircuit fuse blownReplace fuse and check for short circuit.
Wiring or grounding faultyRepair circuit.
Combination meter faultyReplace combination meter.
BCM faulty Replace after making sure that none of above
parts is faulty.
Charge warning light stay
ONCharging system faultyCheck charging system.
Wiring or grounding faultyRepair circuit.
Combination meter faultyReplace combination meter.
BCM faulty Replace after making sure that none of above
parts is faulty.
Condition Possible cause Correction / Reference Item
Main beam (high beam)
indicator does not come
ONCircuit fuse blownReplace fuse and check for short circuit.
Combination switch faultyCheck combination switch referring to
“Headlight Switch (in Lighting Switch)
Inspection in Section 9B”.
Wiring or grounding faultyRepair circuit.
Combination meter faultyReplace combination meter.
Main beam (high beam)
indicator stay ONCombination switch faultyCheck combination switch referring to
“Headlight Switch (in Lighting Switch)
Inspection in Section 9B”.
Wiring or grounding faultyRepair circuit.
Combination meter faultyReplace combination meter.
Condition Possible cause Correction / Reference Item
Warning buzzer shows no
soundingCircuit fuse blownReplace fuse and check for short circuit.
Driver side door switch faultyCheck driver side door switch referring to
“Door Switch (Front / Rear Door) Inspection”.
Lighting switch faultyCheck lighting switch referring to “Headlight
Switch (in Lighting Switch) Inspection in
Section 9B”.
Key reminder switch faultyCheck key reminder switch referring to
“Ignition Switch Inspection”.
Seat belt switch faultyCheck seat belt switch referring to “Front Seat
Belt Inspection in Section 8A”.
Wiring or grounding faultyRepair circuit.
BCM faultyReplace after making sure that none of above
parts is faulty.