DTC 23 [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	MEASURE AUTO LEVELING CONTROL MODULE VOLTAGE •  Turn the ignition switch to the ON position. •  Measure the voltage at auto leveling control module terminal T and terminal R. •  Is the voltage approx. 5 V?	Yes	Go to the next step.
		No	Replace the auto leveling control module. (See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.)
2	MEASURE POWER SUPPLY VOLTAGE FOR FRONT/REAR AUTO LEVELING SENSORS •  Turn the ignition switch to the LOCK position. •  Disconnect the negative battery cable. •  Disconnect the front/rear auto leveling sensor connectors. •  Connect the negative battery cable. •  Turn the ignition switch to the ON position. •  Measure the voltage at front auto leveling sensor terminal C and rear auto leveling sensor terminal T, rear auto leveling sensor connector terminal C and auto leveling control module terminal R. •  Is the voltage approx. 5 V?	Yes	Go to the next step.
		No	Repair or replace the wiring harness between the front/rear auto leveling sensors and the 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 GROUND WIRING HARNESS BETWEEN FRONT/REAR AUTO LEVELING SENSORS AND AUTO LEVELING CONTROL MODULE •  Turn the ignition switch to the LOCK position. •  Disconnect the negative battery cable. •  Disconnect the auto leveling control module. •  Inspect the wiring harnesses between front auto leveling sensor connector terminal A and auto leveling control module terminal L, rear auto leveling sensor connector terminal A and auto leveling control module terminal J for the following. ―  Open circuit ―  Short to body ground •  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 the 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.
4	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.
5	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 23 indicated?	Yes	Replace the auto leveling control module. (See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.)
		No	DTC troubleshooting completed.