DTC 21 [HEADLIGHT AUTO LEVELING SYSTEM]

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Description

• Rear auto leveling sensor signals

Detection Condition

• Rear auto leveling sensor signal voltage is less than 0.4 V, or 4.6 V or more

Possible Cause

• Open or short circuit between the rear auto leveling sensor and auto leveling control module
• Rear auto leveling sensor malfunction
• Auto leveling control module malfunction

System Wiring Diagram

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Diagnostic Procedure

Step | Inspection | Action
--- | --- | ---
1 | VERIFY REAR AUTO LEVELING SENSOR CONNECTOR CONNECTION • Is the rear auto leveling sensor connector connected securely? | Yes | Go to the next step.
No | Connect the connector securely and re-perform the DTC inspection. • If the malfunction recurs, go to the next step.
2 | INSPECT WIRING HARNESS BETWEEN REAR AUTO LEVELING SENSOR AND AUTO LEVELING CONTROL MODULE • Turn the ignition switch to the OFF position. • Disconnect the negative battery cable. • Disconnect the rear auto leveling sensor and auto leveling control module connectors. • Inspect the wiring harness between rear auto leveling sensor connector terminal B and auto leveling control module connector terminal N for the following: ― Open circuit ― 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 rear auto leveling sensor 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 REAR AUTO LEVELING SENSOR • Remove the rear auto leveling sensor. (See REAR AUTO LEVELING SENSOR REMOVAL/INSTALLATION.) • Inspect the rear auto leveling sensor. (See REAR AUTO LEVELING SENSOR INSPECTION.) • Is the rear auto leveling sensor normal? | Yes | Go to the next step.
No | Replace the rear auto leveling sensor. (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 rear auto leveling sensor. • 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 21 displayed? | Yes | Replace the auto leveling control module. (See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.)
No | DTC troubleshooting completed.