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If the headlamps illuminate only at low beam regardless of the lighting switch position, the headlamp fail-safe function may be activated.
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- Malfunction of the column switch
- Malfunction of the front-ECU
- Damaged harness wires and connectors
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Check that the power supply and earth lines to the column switch (column-ECU) and the front-ECU and the SWS communication lines are normal.
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OK: "OK" are displayed for all the items
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Q.
Are the check result normal?
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"OK" are displayed for all the items : Go to Step 2.
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"NG" is displayed on the "COLUMN ECU" menu. : Refer to Inspection Procedure A-2 "Communication with column switch (column-ECU) is not possible ."
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"NG" is displayed on the "FRONT ECU" menu. : Refer to Inspection Procedure A-4 "Communication with front-ECU is not possible ."
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Check that the headlamps illuminate normally.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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Replace the column switch.
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