Inspection Procedure 4: Audio illuminations does not work normally.


caution Before replacing the radio and CD player, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.










OPERATION



COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of ETACS-ECU
  • Malfunctions of radio and CD player
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III other system diagnosis code
Check whether the diagnosis code is set by the ETACS-ECU (lighting switch).

Q. Is the diagnosis code set?
Diagnose the ETACS-ECU (Refer to .)
Go to Step 2.

STEP 2. Connector check: B-305 ETACS-ECU connector, B-104 radio and CD player connector

Q. Is the check result normal?
Go to Step 3.
Repair the connector concerned.

STEP 3. Check the wiring harness between B-305 ETACS-ECU connector terminal No.1 and B-104 radio and CD player connector terminal No.4.

  • Check the communication lines for open circuit and short circuit.

Q. Is the check result normal?
Go to Step 4.
Repair the wiring harness.

STEP 4. Replace the radio and CD player temporarily, and check the trouble symptom.
Substitute the ETACS-ECU with good one. When the tail lamps illuminate, check that the illumination of the radio and CD player is switched from day mode to night mode.

Q. Is the check result normal?
Replace the radio and CD player.
Replace the ETACS-ECU and register the ID codes (Refer to ).