No.1 HEADLIGHT AUTO LEVELING WARNING LIGHT ILLUMINATES WHEN THE IGNITION IS SWITCHED TO ON [HEADLIGHT AUTO LEVELING SYSTEM]

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1
Headlight auto leveling warning light illuminates when the ignition is switched to ON
DESCRIPTION
•  The headlight auto leveling warning light flashes when the ignition is switched ON.
•  The headlight auto leveling warning light illuminates when the ignition is switched ON.
POSSIBLE CAUSE
•  Headlight auto leveling function related electrical part malfunction
―  Front auto leveling sensor related part malfunction
•  Output signal excessively high or low
•  Front auto leveling sensor malfunction
―  Rear auto leveling sensor related part malfunction
•  Output signal excessively high or low
•  Rear auto leveling sensor malfunction
―  Auto leveling control module malfunction
―  Auto leveling control module power supply voltage excessively high
•  Headlight auto leveling warning light illumination circuit malfunction
―  Instrument cluster malfunction
―  Communication error between auto leveling control module and Instrument cluster

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT FRONT AND REAR AUTO LEVELING SENSOR INSTALLATION
•  Inspect the front and rear auto leveling sensor installation.
•  Is there any bending, damage or dislocated links at the bracket?
Yes
Repair or replace the malfunctioning part.
No
Go to the next step.
2
INSPECT AUTO LEVELING CONTROL MODULE POWER SUPPLY VOLTAGE
•  Switch the ignition to ON.
•  Measure the voltage between auto leveling control module terminals H and ground.
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect and repair or replace the malfunctioning part for an open circuit between the ignition switch (push start) and auto leveling control module terminals H.
3
INSPECT AUTO LEVELING CONTROL MODULE GROUND CIRCUIT FOR OPEN CIRCUIT
•  Switch the ignition to off.
•  Disconnect the auto leveling control module connector.
•  Verify the continuity between the auto leveling control module wiring harness-side connector terminal F and ground.
•  Is there continuity?
Yes
Connect the auto leveling control module connector, then go to the next step.
No
Inspect and repair for a loose or poor connection in the auto leveling control module ground point.
4
INSPECT IF MALFUNCTION IS IN FRONT AUTO LEVELING SENSOR OR ELSEWHERE
•  Switch the ignition to ON.
•  Turn the headlights on.
•  Measure the voltage between auto leveling control module terminal G and ground.
•  Is the voltage 0.5—4.5V?
Yes
Go to the next step.
No
Go to Step 8.
5
INSPECT IF MALFUNCTION IS IN REAR AUTO LEVELING SENSOR OR ELSEWHERE
•  Turn the headlights on.
•  Measure the voltage between auto leveling control module terminal E and ground.
•  Is the voltage 0.5—4.5V?
Yes
Go to Step 10.
No
Go to the next step.
6
INSPECT REAR AUTO LEVELING SENSOR SIGNAL RELATED CIRCUIT
•  Inspect for an open or short circuit in the wiring harness between auto leveling control module terminal E and rear auto leveling sensor terminal B.
•  Is an open or short circuit detected?
Yes
Repair or replace the malfunctioning part for an open or short circuit.
No
Go to the next step.
7
INSPECT REAR AUTO LEVELING SENSOR
•  Inspect the rear auto leveling sensor.
•  Is the rear auto leveling sensor normal?
Yes
Repair or replace the malfunctioning part for an open circuit in the following:
•  Between auto leveling control module terminal M and rear leveling sensor terminal C
•  Between auto leveling control module terminal D and rear auto leveling sensor terminal A
No
Replace the rear auto leveling sensor.
(See AUTO LEVELING SENSOR REMOVAL/INSTALLATION.)
8
INSPECT IF MALFUNCTION IS IN FRONT AUTO LEVELING SENSOR POWER OR GROUND CIRCUIT OR ELSEWHERE
•  Switch the ignition to off.
•  Disconnect the front and rear auto leveling sensor connectors.
•  Switch the ignition to ON.
•  Turn the headlights on.
•  Measure the voltage between front auto leveling sensor terminals A and C at the wiring harness-side connector.
•  Is the voltage 4.75—5.25V?
Yes
Go to the next step.
No
Inspect for an open or short circuit in the following:
•  Between auto leveling control module terminal M and front auto leveling sensor terminal C
•  Between auto leveling control module terminal M and rear auto leveling sensor terminal C
•  Between auto leveling control module terminal D and front auto leveling sensor terminal A
•  Between auto leveling control module terminal D and rear auto leveling sensor terminal A
Repair or replace the malfunctioning part for an open or short circuit.
9
INSPECT FRONT AUTO LEVELING SENSOR SIGNAL CIRCUIT FOR OPEN OR SHORT CIRCUIT
•  Inspect for an open or short circuit in the wiring harness between auto leveling control module terminal G and front auto leveling sensor terminal B.
•  Is an open or short circuit detected?
Yes
Repair or replace malfunctioning part for an open or short circuit.
No
Inspect the front auto leveling sensor.
If it is malfunctioning, replace the front auto leveling sensor.
(See AUTO LEVELING SENSOR INSPECTION.)
(See AUTO LEVELING SENSOR REMOVAL/INSTALLATION.)
10
INSPECT IF MALFUNCTION CAUSE IS INSTRUMENT CLUSTER OR ELSEWHERE
•  Turn on and off all the indicator lights and warning lights in the instrument cluster using the M-MDS simulation function WL+IL.
•  Does the auto leveling warning light turn on and off according to simulation function?
Yes
Go to the next step.
No
Replace the instrument cluster.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
11
INSPECT IF THE MALFUNCTION IS IN VEHICLE SPEED SIGNAL CIRCUIT OR ELSEWHERE
•  Retrieve the DTCs from all vehicle modules using the M-MDS or equivalent.
•  Is there the following DTC displayed?
―  CAN communication wiring harness
Yes
Go to the appropriate DTC inspection.
No
Replace the auto leveling control module.
(See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.)