THE HEADLIGHT AUTO LEVELING SYSTEM DOES NOT OPERATE IN RESPONSE TO VEHICLE POSTURE [HEADLIGHT AUTO LEVELING SYSTEM]

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Note
•  If there is any vehicle malfunction complaint lodged by a customer, first perform malfunction diagnosis according to the troubleshooting procedure. (See FOREWORD [HEADLIGHT AUTO LEVELING SYSTEM].)

Item
THE HEADLIGHT AUTO LEVELING SYSTEM DOES NOT OPERATE IN RESPONSE TO VEHICLE POSTURE
Description
•  The headlight auto-leveling system does operate in response to the number of occupants, cargo load in luggage compartment, and the fuel level.
•  One side of the headlight leveling actuator does not operate.
Possible Causes
•  Short or open circuit in the wiring harness between headlight leveling actuator and auto leveling control module (without AFS)
―  Auto leveling control module terminal P—headlight leveling actuator (LH/RH) terminal I
―  Auto leveling control module terminal O—headlight leveling actuator (LH/RH) terminal F
―  Auto leveling control module terminal M—headlight leveling actuator (LH/RH) terminal L
•  Headlight leveling actuator malfunction
•  Auto leveling control module malfunction
•  Poor installation of the auto leveling sensor

Diagnostic Procedure

Step

Inspection

Action
1
DETERMINE IF MALFUNCTIONING LOCATION IS AUTO-LEVELING SENSOR
•  Verify the malfunction symptom.
•  Do both sides of the headlight auto leveling system not operate?
Yes
Go to Step 5.
No
Go to the next step.
2
LEVELING OPERATION SIGNAL INSPECTION
•  Verify the headlight leveling actuator operation using the M-MDS.
•  Is the headlight leveling actuator normal?
Yes
Go to Step 6.
No
Go to the next step.
3
LEVELING OPERATION SIGNAL CIRCUIT INSPECTION
•  Inspect wiring harness between Auto leveling control module on the side of the auto leveling system which does operate and the headlight leveling actuator.
―  Auto leveling control module terminal O and headlight leveling actuator (LH/RH) terminal F
•  Is there any open or short circuit in the wiring harness?
Yes
•  Refer to the wiring diagram and verify whether or not there is a common connector between Auto leveling control module terminal O and headlight leveling actuator (LH/RH) terminal F.
If there is a common connector:
―  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open or short circuit.
―  Repair or replace the malfunctioning part.
If there is no common connector:
―  Repair or replace the wiring harness which has an open or short circuit.
No
Go to the next step.
4
HEADLIGHT LEVELING INSPECTION
•  Replace the front combination light on the side of the auto-leveling system that is not operating.
•  Does the auto-leveling system operate correctly?
Yes
Troubleshooting completed.
No
•  Replace the auto leveling control module.
5
INSPECT WIRING HARNESS BETWEEN HEADLIGHT LEVELING ACTUATOR AND CONTROL MODULE
•  Inspect the wiring harness between the following terminals.
―  Auto leveling control module terminal M and headlight leveling actuator (LH/RH) terminal L
―  Auto leveling control module terminal O and headlight leveling actuator (LH/RH) terminal F
―  Auto leveling control module terminal P and headlight leveling actuator (LH/RH) terminal I
•  Is there any open or short circuit in the wiring harness?
Yes
•  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals.
―  Auto leveling control module terminal M and headlight leveling actuator (LH/RH) terminal L
―  Auto leveling control module terminal O and headlight leveling actuator (LH/RH) terminal F
―  Auto leveling control module terminal P and headlight leveling actuator (LH/RH) terminal I
If there is a common connector:
―  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open or short circuit.
―  Repair or replace the malfunctioning part.
If there is no common connector:
―  Repair or replace the wiring harness which has an open or short circuit.
No
Go to the next step.
6
VERIFY IF MALFUNCTION IS RESOLVED
•  Has the malfunction symptom been eliminated?
Yes
Troubleshooting completed. (Explain the contents of the servicing to the customer.)
No
Repeat the diagnosis from Step 1.
If the malfunction has not been resolved, replace the auto leveling control module.
(See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.)