T–156
ON-BOARD DIAGNOSTIC [HEADLIGHT AUTO LEVELING SYSTEM]
Diagnostic procedure
End Of Sie
STEP INSPECTION ACTION
1
INSPECT FRONT LEVELING SENSOR
CONNECTION
• Check installation condition of front auto
leveling sensor and fit of connector.
• Are installation condition and fit okay?
Yes Go to next step.
No After correcting fit, clear DTC and check DTC again.
• If DTC is displayed again, go to next step.
2
INSPECT WIRING HARNESS BETWEEN
FRONT AUTO LEVELING SENSOR
CONNECTOR AND HEADLIGHT (LH)
CONNECTOR
• Disconnect front auto leveling sensor
connector (6-pin) and headlight (LH)
connector (4-pin).
• Is there continuity between the following
connectors?
— Front auto leveling sensor connector
(terminal B) and headlight (LH) connector
(terminal 2C)
Yes Go to next step.
No Repair or replace wiring harness between front auto leveling
sensor and headlight (LH).
3
INSPECT WIRING HARNESS BETWEEN
FRONT AUTO LEVELING SENSOR
CONNECTOR AND HEADLIGHT (LH)
CONNECTOR
• Disconnect front auto leveling sensor
connector (6-pin) and headlight (LH)
connector (4-pin).
• Is there no continuity between the following
connectors?
— Front auto leveling sensor connector
(terminal B) and headlight (LH) connector
(terminal 2B)
— Front auto leveling sensor connector
(terminal B) and headlight (LH) connector
(terminal 2A)
Yes Go to next step.
No Repair or replace wiring harness between front auto leveling
sensor and headlight (LH).
4
INSPECT HEADLIGHT (LH)
• Disconnect auto leveling control unit (main)
connector (20-pin) and headlight (LH)
connector (4-pin).
• Is there continuity between the following
connectors?
— Auto leveling control unit (main) connector
(terminal H) and headlight (LH) connector
(terminal 2C)
Yes Go to next step.
No Possible cause is an open circuit in headlight (LH). Replace
headlight (LH). (See T–26 FRONT COMBINATION LIGHT
REMOVAL/INSTALLATION)
5
INSPECT HEADLIGHT (LH)
• Disconnect auto leveling control unit (main)
connector (20-pin) and headlight (LH)
connector (4-pin).
• Is there continuity between the following
connectors?
— Auto leveling control unit (main) connector
(terminal G) and headlight (LH) connector
(terminal 2C)
— Auto leveling control unit (main) connector
(terminal K) and headlight (LH) connector
(terminal 2C)
— Auto leveling control unit (main) connector
(terminal E) and headlight (LH) connector
(terminal 2C)
Yes Replace front auto leveling sensor.
(See T–32 FRONT AUTO LEVELING SENSOR REMOVAL/
INSTALLATION)
No Possible cause is an open circuit in headlight (LH). Replace
headlight (LH). (See T–26 FRONT COMBINATION LIGHT
REMOVAL/INSTALLATION)
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