No.1 AUTO LEVELING WARNING LIGHT ILLUMINATES WHEN IGNITION SWITCH TURNED TO ON POSITION [HEADLIGHT AUTO LEVELING SYSTEM]

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1

Auto leveling warning light illuminates when ignition switch turned to ON position
POSSIBLE CAUSE
•   Electrical part malfunction related to headlight auto leveling function
―  Auto leveling sensor related part malfunction
•  Auto leveling control module power supply voltage is excessively low
•  Auto leveling sensor signal voltage is excessively high or low
•  Auto leveling sensor malfunction
―  Headlight leveling actuator (RH or LH) (built-in front combination light) related part the malfunction
•  Headlight leveling actuator (RH or LH) related circuit malfunction
•  Headlight leveling actuator (RH or LH) malfunction
―  Auto leveling control module malfunction
―  Auto leveling control module power supply voltage is excessively high
―  Vehicle speed signal is above 180 km/h or more.
•  Instrument cluster malfunction
•  Short to power supply circuit between instrument cluster terminal 2O and auto leveling control module terminal M
•  Auto leveling warning light control circuit malfunction
―  Instrument cluster malfunction
―  Short to ground between instrument cluster terminal 1D and auto leveling control module terminal I

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY AUTO LEVELING SENSOR INSTALLATION
•  Inspect the auto leveling sensor installation.
•  Are there any bends, damage or dislocated links at the bracket?
Yes
Repair or replace malfunctioning part.
No
Go to the next step.
2
INSPECT AUTO LEVELING CONTROL MODULE POWER SUPPLY VOLTAGE
•  Turn the ignition switch to the ON position.
•  Measure the voltage between auto leveling control module terminals A and ground.
•  Is the voltage B+?
Yes
Go to the next step.
No
Repair or replace for an open circuit between the auto leveling control module terminal A and the ignition switch.
3
INSPECT AUTO LEVELING CONTROL MODULE GROUND CIRCUIT FOR OPEN CIRCUIT
•  Turn the ignition switch to the off position.
•  Disconnect the auto leveling control module connector.
•  Verify the continuity between auto leveling control module terminal B and ground.
•  Is there continuity?
Yes
Connect the auto leveling control module connector, then go to Step 5.
No
Go to the next step.
4
INSPECT GROUND POINT
•  Inspect the ground point for the auto leveling control module.
•  Is there a loose or poor connection at ground point?
Yes
Retighten the ground point.
No
Repair or replace for an open circuit between auto leveling control module terminal B and ground.
5
INSPECT IF MALFUNCTION IS IN AUTO LEVELING SENSOR OR ELSEWHERE
•  Turn the ignition switch to the ON position.
•  Turn the headlights on.
•  Measure the voltage between auto leveling control module terminal S and ground.
•  Is the voltage 0.25—4.75 V?
Yes
Go to the next step.
No
Go to Step 8.
6
INSPECT AUTO LEVELING SENSOR SIGNAL CIRCUIT
•  Inspect the wiring harness between auto leveling control module terminal S and auto leveling sensor terminal B.
•  Is there an open or short circuit?
Yes
Repair or replace for an open or short circuit.
No
Go to the next step.
7
INSPECT AUTO LEVELING SENSOR
•  Inspect the auto leveling sensor.
•  Is the auto leveling sensor normal?
Yes
Repair or replace for an open circuit at the following:
•  Between auto leveling control module terminal Q and auto leveling sensor terminal A
•  Between auto leveling control module terminal U and auto leveling sensor terminal C
No
Replace the auto leveling sensor.
(See AUTO LEVELING SENSOR REMOVAL/INSTALLATION.)
8
INSPECT IF MALFUNCTION IS IN AUTO LEVELING WARNING LIGHT CONTROL CIRCUIT OR ELSEWHERE
•  Turn the ignition switch to the off position.
•  Disconnect the auto leveling control module and instrument cluster connectors.
•  Verify the continuity between auto leveling control module terminal I and ground.
•  Is there continuity?
Yes
Repair or replace for a short to ground.
No
Go to the next step.
9
INSPECT INSTRUMENT CLUSTER
•  Inspect the auto leveling warning light using the instrument cluster input/output check mode.
•  Is the check result normal?
Yes
Go to the next step.
No
Replace the instrument cluster.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
10
INSPECT IF MALFUNCTION IS IN VEHICLE SPEED SIGNAL CIRCUIT OR ELSEWHERE
•  Turn the ignition switch to the off position.
•  Disconnect the auto leveling control module connector.
•  Turn the ignition switch to the ON position.
•  Measure the voltage between auto leveling control module terminal M and ground.
•  Is the voltage B+?
Yes
Repair or replace for a short to the power supply.
No
Go to the next step.
11
INSPECT IF MALFUNCTION IS IN WIRING HARNESS BETWEEN AUTO LEVELING CONTROL MODULE AND HEADLIGHT LEVELING ACTUATOR
•  Inspect for open or short circuit in wiring harness.
Right-side:
―  Auto leveling control module terminal E—right-side headlight leveling actuator terminal A
―  Auto leveling control module terminal H—right-side headlight leveling actuator terminal B
―  Auto leveling control module terminal F—right-side headlight leveling actuator terminal C
Left-side:
―  Auto leveling control module terminal C—left-side headlight leveling actuator terminal A
―  Auto leveling control module terminal G—left-side headlight leveling actuator terminal B
―  Auto leveling control module terminal D—left-side headlight leveling actuator terminal C
•  Is there an open or short circuit?
Yes
Repair or replace for open or short circuit.
No
Go to the next step.
12
INSPECT IF MALFUNCTION IS IN HEADLIGHT LEVELING ACTUATOR OR AUTO LEVELING CONTROL MODULE
•  Replace the front combination lights on the left and right separately with a front combination light in which the actuator operates normally.
•  Does the auto leveling warning light illuminate after replacing the front combination light on the left or right side?
Yes
Replace the auto leveling control module.
(See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.)
No
Replace the suspected side front combination light.
(See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION.)