DTC 24 [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	INSPECT FRONT/REAR AUTO LEVELING SENSORS ASSEMBLY CONDITIONS •  Inspect the assembly conditions 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 assembly, 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 harnesses between front/rear auto leveling sensors and 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.
3	INSPECT FRONT/REAR 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 •  Install the front/rear auto leveling sensors. •  Connect all the connectors. •  Connect the negative battery cable. •  Perform the auto leveling system initial setting. (See AUTO LEVELING SYSTEM INITIALIZATION.) •  Perform the headlight auto leveling system DTC inspection. (See DTC INSPECTION [HEADLIGHT AUTO LEVELING SYSTEM].) •  Is DTC 24 displayed?	Yes	Replace the auto leveling control module. (See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.)
		No	DTC troubleshooting completed.