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.

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.
1		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.
2		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.
3		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.)
4		No	DTC troubleshooting completed.