DTC 23 [HEADLIGHT AUTO LEVELING SYSTEM]

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Description

• Front/rear auto leveling sensor power supply

Detection Condition

• Malfunction in power supply (5 V) to front/rear auto leveling sensors from auto leveling control module

Possible Cause

• Open or short circuit to body ground between front/rear auto leveling sensors and auto leveling control module
• Front auto leveling sensor malfunction
• Rear auto leveling sensor malfunction
• Auto leveling control module malfunction

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 OFF 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 OFF 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.