T–154
ON-BOARD DIAGNOSTIC [HEADLIGHT AUTO LEVELING SYSTEM]
Diagnostic procedure
End Of Sie
STEP INSPECTION ACTION
1
INSPECT POWER SUPPLY CIRCUIT OF
HEADLIGHT (LH)
• Disconnect headlight (LH) connector (4-pin).
• Turn the ignition switch to ON.
• Measure voltage at headlight (LH) connector
terminal 2A.
• Is voltage approximately 5 V?
Yes Go to next step.
No Go to step 4.
2
INSPECT POWER SUPPLY CIRCUIT OF
FRONT AUTO LEVELING SENSOR
• Turn the ignition switch to OFF and connect
headlight (LH) connector (4-pin) again.
• Disconnect front auto leveling sensor
connector (6-pin).
• Measure voltage at front auto leveling sensor
connector terminal D.
• Is voltage approximately 5 V?
Yes Replace front auto leveling sensor.
(See T–32 FRONT AUTO LEVELING SENSOR REMOVAL/
INSTALLATION)
After replacement, clear DTC and check DTC again.
• If DTC is displayed again, go to next step.
No Repair or replace wiring harness between front auto leveling
sensor and headlight (LH).
3
INSPECT POWER SUPPLY CIRCUIT OF
REAR AUTO LEVELING SENSOR
• Disconnect rear auto leveling sensor
connector.
• Measure voltage at rear auto leveling sensor
connector terminal D.
• Is voltage approximately 5 V?
Yes Replace front auto leveling sensor.
(See T–32 REAR AUTO LEVELING SENSOR REMOVAL/
INSTALLATION)
After replacement, clear DTC and check DTC again.
• If DTC is displayed again, go to next step.
No Repair or replace wiring harness between rear 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 K) and headlight (LH) connector
(terminal 2A)
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).
• Is there no continuity between the following
connectors?
— Terminals K and E
— Terminals K and D
— Terminals K and L
Yes Replace auto leveling control unit.
(See T–30 DISCHARGE HEADLIGHT CONTROL UNIT
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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