DTC 12 [HEADLIGHT AUTO LEVELING SYSTEM]

id0902i7403600

Description

• Signals during front/rear auto leveling sensor initial setting

Detection Condition

• Front auto leveling sensor signal voltage is not within 2.0 V—3.4 V during auto leveling control module initial setting
• Rear auto leveling sensor signal voltage is not within 3.3 V—4.6 V during auto leveling control module initial setting

Possible Cause

• Poor assembly of the front/rear auto leveling sensors
• Open or short circuit between front/rear auto leveling sensors and auto leveling control module
• Front/rear auto leveling sensors malfunction
• Auto leveling control module malfunction

System Wiring Diagram

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Diagnostic Procedure

Step | Inspection | Action
--- | --- | ---
1 | INSPECT FRONT/REAR AUTO LEVELING SENSORS ASSEMBLY CONDITION • Inspect the assembly condition of the front/rear auto leveling sensors. • Are the front/rear auto leveling sensors assembled correctly? | Yes | Go to the next step.
No | Assemble the front/rear auto leveling sensors correctly. (See FRONT AUTO LEVELING SENSOR REMOVAL/INSTALLATION.) (See REAR AUTO LEVELING SENSOR REMOVAL/INSTALLATION.) After assembling, perform the auto leveling system initial setting, and re-perform the DTC inspection. • If the malfunction recurs, go to the next step.
2 | INSPECT WIRING HARNESS BETWEEN FRONT/REAR AUTO LEVELING SENSORS AND AUTO LEVELING CONTROL MODULE • Turn the ignition switch to the OFF position. • Disconnect the negative battery cable. • Disconnect the front/rear auto leveling sensors and auto leveling control module connectors. • Inspect the wiring harnesses between front auto leveling sensor connector terminal B and auto leveling control module connector terminal P, and between rear auto leveling sensor connector terminal B and auto leveling control module connector terminal N for the following: ― Short to power supply ― Short to body ground ― Open circuit • Are the wiring harnesses normal? | Yes | Go to the next step.
No | Repair or replace the wiring harness between the front/rear auto leveling sensors and auto leveling control module. After replacement, perform the auto leveling system initial setting, and re-perform the DTC inspection. • If the malfunction recurs, go to the next step.
3 | INSPECT FRONT/REAR AUTO LEVELING SENSORS • Remove the front/rear auto leveling sensors. (See FRONT AUTO LEVELING SENSOR REMOVAL/INSTALLATION.) (See REAR AUTO LEVELING SENSOR REMOVAL/INSTALLATION.) • Inspect the front/rear auto leveling sensors. (See FRONT AUTO LEVELING SENSOR INSPECTION.) (See REAR AUTO LEVELING SENSOR INSPECTION.) • Are the front/rear auto leveling sensors normal? | Yes | Go to the next step.
No | Replace the front/rear auto leveling sensors. (See FRONT AUTO LEVELING SENSOR REMOVAL/INSTALLATION.) (See REAR AUTO LEVELING SENSOR REMOVAL/INSTALLATION.) After replacement, perform the auto leveling system initial setting, and re-perform the DTC inspection. • If the malfunction recurs, go to the next step.
4 | PERFORM DTC INSPECTION • Connect all the connectors. • Connect the negative battery cable. • Perform the auto leveling system initial setting. (See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.) • Perform the headlight auto leveling system DTC inspection. (See DTC INSPECTION [HEADLIGHT AUTO LEVELING SYSTEM].) • Is DTC 12 displayed? | Yes | Replace the auto leveling control module. (See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.)
No | DTC troubleshooting completed.