Inspection Procedure 9: When the electric motor switch is turned to the ON position with the lighting switch at the OFF or TAIL position, the headlamps will illuminate briefly.

caution

Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

COMMENTS ON TROUBLE SYMPTOM

If the headlamps illuminate briefly when the electric motor switch is turned to the ON position with the lighting switch at the OFF or TAIL position, room lamp fuse No. 13 in the junction block is blown (pulled off).

PROBABLE CAUSES

Malfunction of room lamp fuse No. 13 in the junction block
Malfunction of the column switch
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check room lamp fuse No. 13.

Check room lamp fuse No. 13 in the junction block is blown or pulled off.

Q. Is the check result normal?

	Go to Step 2.

	The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - Inspection service points for a blown fuse ).

STEP 2. Check that the headlamps operate.

Check that the low-beam and high-beam headlamps work normally.

Q. Is the check result normal?

	Go to Step 3.

	Follow Inspection Procedure 1: None of the low-beam headlamps illuminate (Refer to ) and Inspection Procedure 2: None of the high-beam headlamps illuminate (Refer to ). Then go to Step 4.

STEP 3. M.U.T.-III diagnosis code.

Check if the ETACS-ECU sets a diagnosis code.

Q. Is the diagnosis code set?

	Diagnose the ETACS-ECU.(Refer to ) After the repair, go to Step 4.

	Go to Step 4.

STEP 4. Connector check: B-201 column switch connector, B-304 ETACS-ECU connector

Q. Is the check result normal?

	Go to Step 5.

	Repair the defective connector.

STEP 5. Voltage measurement at B-201 column switch connector.

(1)Disconnect the connector, and measure at the wiring harness-side connector.

(2)Voltage between B-201 column switch connector connector terminal No.1 and the body earth
OK: System voltage

Q. Is the check result normal?

	Go to Step 7

	Go to Step 6.

STEP 6. Check the wiring harness between B-201 column switch connector terminal No.1 and B-301 junction block connector terminal No.3.

Check the power supply line for open circuit and short circuit.

note

Prior to the wiring harness inspection, check the joint connector B-05, and repair if necessary.

Q. Is the check result normal?

	Go to Step 7.

	Repair the wiring harness.

STEP 7. Retest the system.

Check whether the headlamps illuminate briefly when the electric motor switch is turned to the ON position with the lighting switch in the OFF or TAIL position.

Q. Is the check result normal?

	The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).

	Replace the column switch (wiper and washer switch).

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