DTC 31 [HEADLIGHT AUTO LEVELING SYSTEM]

id0902i7404100

Description

• Headlight leveling actuator signals

Detection Condition

• Output signal to headlight leveling actuator is abnormal

Possible Cause

• Short between auto leveling control module and headlight leveling actuator
• Headlight leveling actuator malfunction
• Auto leveling control module malfunction

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 OFF 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.