Inspection Procedure 5: Audio illuminations does not work normally.

caution

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

OPERATION

When the position lamp is illuminated, the audio illumination is switched to the nighttime illumination.
When the brightness is adjusted using the combination meter rheostat switch, the audio illumination brightness is also adjusted.

COMMENTS ON TROUBLE SYMPTOM

The centre panel unit, audio unit, combination meter, or communication line from the audio unit to the audio amplifier or to the combination meter may have a problem.

PROBABLE CAUSES

Malfunction of combination meter
Malfunctions of centre panel unit
Malfunctions of audio unit
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Operation check of the centre panel unit

Operate the audio control switch of the centre panel unit, and check if the audio operates normally.

Q. Is the check result normal?

	Go to Step 2.

	Refer to Inspection Procedure 4 "The audio does not operate normally by operating the audio control unit of the centre panel unit." .

STEP 2. Check the taillamp

Set the lighting switch to the TAIL position, and check if the taillamp illuminates normally.

Q. Is the check result normal?

	Go to Step 3.

	Troubleshoot the tail-lamp (Refer to Rear Combinaiton Lamp - Troubleshooting ).

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

Check if diagnosis code is set to the combination meter.

Q. Is the diagnosis code set?

	Troubleshoot the combination meter (Refer to ).

	Go to Step 4.

STEP 4. Connector check: C-16 audio unit connector, C-106 centre panel unit connector

Q. Is the check result normal?

	Go to Step 5.

	Repair the connector concerned.

STEP 5. Check the wiring harness between C-16 audio unit connector terminal No.9 and C-106 centre panel unit connector terminal No.4.

Check the communicaiton line for open circuit.

Q. Is the check result normal?

	Go to Step 6.

	Repair the wiring harness.

STEP 6. Replace the centre panel unit temporarily, and check the trouble symptom.

Replace the centre panel unit temporarily, and check that the audio illumination works normally.

Q. Is the check result normal?

	Replace the centre panel unit.

	Replace the audio unit.