Inspection Of Headlight Leveling Control Module And Its Circuit (Headlight Auto Leveling System) - Suzuki SX4 Service Manual

9B-16 Lighting Systems:
Terminal
2 Headlight control signal
Power supply for auto-on
3
headlight sensor
Auto-on headlight sensor
4
signal
Ground for auto-on headlight
5
controller
Ground for auto-on headlight
6
sensor
7 Lighting switch signal
8 Ignition switch signal

Inspection of Headlight Leveling Control Module and Its Circuit (Headlight Auto Leveling System)

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.
[A]: Headlight leveling control module connector (viewed from harness side)
Circuit
[A]
Specification
Lighting switch at "AUTO"
0 V
position, headlight at ON.
Ignition switch is at ON
10 – 14 V position, lighting switch at
"OFF" position.
Ignition switch is at OFF
About 5 V
position.
Light the sensor lens with
3 – 4.5 V
incandescent lamp 100 W
Cover the sensor lens with
Less than 1 V
hand.
0 V
0 V
Ignition switch is at ON
0 V position, lighting switch at
"AUTO" position.
Ignition switch is at ON
1.0 – 5.0 V position, lighting switch at other
than "AUTO" position.
Ignition switch is at ON
10 – 14 V
position.
9 6
24 23 22 21 20 19 18 17 16
Condition
—
—
S7RW0A9204021
5 3 1
13 12 11 10
V
I6RW0C920012-01