DTC 31 [HEADLIGHT AUTO LEVELING SYSTEM]

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Description

Detection Condition

Possible Cause

System Wiring Diagram

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Diagnostic Procedure

Step	Inspection		Action
1	VERIFY CONNECTOR CONNECTION CONDITION •  Are the auto leveling control module and the front combination light connectors connected securely?	Yes	Go to the next step.
		No	Connect the connector securely.
2	INSPECT AUTO LEVELING CONTROL MODULE •  Measure the voltage for auto leveling control module terminals AA and AB. •  Is the voltage B+?	Yes	Go to the next step.
		No	Replace the auto leveling control module. (See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.)
3	INSPECT POWER SUPPLY VOLTAGE OF HEADLIGHT LEVELING ACTUATOR •  Measure the voltage at front combination light terminal E. •  Is the voltage B+?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between the front combination light and the auto leveling control module. After repair or replacement, perform the auto leveling system initial setting, and re-perform the DTC inspection. •  If the malfunction recurs, go to the next step.
4	INSPECT GROUND WIRING HARNESS BETWEEN AUTO LEVELING CONTROL MODULE AND HEADLIGHT LEVELING ACTUATOR •  Turn the ignition switch to the LOCK position. •  Disconnect the negative battery cable. •  Disconnect the front combination light connector. •  Disconnect the auto leveling control module connector. •  Inspect the wiring harness between auto leveling control module terminal X and front combination light (RH) terminal D, and auto leveling control module terminal W and front combination light (LH) terminal D for the following: ―  Short to power supply •  Is the wiring harness normal?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between the front combination light and the auto leveling control module. After repair or replacement, perform the auto leveling system initial setting, and re-perform the DTC inspection. •  If the malfunction recurs, go to the next step.
5	INSPECT WIRING HARNESS BETWEEN AUTO LEVELING CONTROL MODULE AND HEADLIGHT LEVELING ACTUATOR •  Inspect the wiring harness between auto leveling control module terminal Z and front combination light (RH) terminal E, and auto leveling control module terminal Y and front combination light (LH) terminal E for the following: ―  Short to power supply ―  Short to body ground •  Is the wiring harness normal?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between the front combination light and the auto leveling control module. After repair or replacement, perform the auto leveling system initial setting, and re-perform the DTC inspection. •  If the malfunction recurs, go to the next step.
6	PERFORM HEADLIGHT LEVELING ACTUATOR OPERATION INSPECTION •  Connect the auto leveling control module connector. •  Connect the front combination light connector. •  Connect the negative battery cable. •  Perform the auto leveling system inspection. (See AUTO LEVELING SYSTEM INITIALIZATION.) •  Does the headlight leveling actuator operate?	Yes	Go to the next step.
		No	Replace the front combination light, then go to the next step. (See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION.)
7	PERFORM DTC INSPECTION •  Perform the auto leveling system initial setting. (See AUTO LEVELING SYSTEM INITIALIZATION.) •  Perform the auto leveling system DTC inspection. (See DTC INSPECTION [HEADLIGHT AUTO LEVELING SYSTEM].) •  Is DTC 31 displayed?	Yes	Replace the auto leveling control module. (See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.)
		No	DTC troubleshooting completed.