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When a vehicle is at a standstill or being driven at a constant speed for 12 seconds or
more (except on rough road), the headlamp automatic levelling-ECU inputs a headlamp LO relay signal,
vehicle speed signal, and height signal for judgment and operates the levelling.
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Assuming that the automatic levelling diagnosis code is not set, if neither right nor
left automatic levelling operates, the headlamp automatic levelling-ECU, wiring harness and connectors
between the headlamp automatic levelling-ECU and the front-ECU (headlamp relay: LO), the vehicle
speed sensor (vehicle signal abnormality), or wiring harness and connectors between the headlamp
automatic levelling-ECU and the vehicle speed sensor may be defective.
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- Malfunction of the headlamp automatic levelling-ECU
- Malfunction of the vehicle speed sensor
- Damaged wiring harness and connectors
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Q.
Does the warning lamp blink normally?
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INSPECTION PROCEDURE 1 "Diagnosis code is not set." Refer to
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Q.
Does the speed meter operate normally?
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Carry out troubleshooting for the speed meter. (Refer to Combination Meter -
Troubleshooting .)
After the troubleshooting for the speed meter, go to Step 3.
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Q.
Is the check result normal?
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Repair the defective connector.
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(1)Disconnect the connector, and measure at the wiring harness-side connector.
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(2)Turn "ON" the headlamp switch.
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(3)Voltage between D-125 headlamp automatic levelling-ECU connector (terminal No.
6) and body earth. OK: System voltage
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Q.
Is the check result normal?
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- Check the communication lines for open circuit and short circuit.
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Q.
Is the check result normal?
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Repair the wiring harness.
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Q.
Is the check result normal?
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Repair the defective connector.
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- Check the communication lines for open circuit.
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Q.
Is the check result normal?
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Repair the wiring harness.
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Check that the automatic levelling operates normally.
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Q.
Is the check result normal?
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Intermittent malfunction. (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection Service
Points -
How to Cope with Intermittent Malfunctions .)
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Replace the headlamp automatic levelling-ECU.
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