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.

COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of combination meter
  • Malfunction of heater controller assembly (A/C-ECU) <Vehicles without A/C> or A/C controller assembly (A/C-ECU) <Vehicles with A/C>
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check that the tail lamps illuminate.

Q. Is the check result normal?
Go to Step 2.
Diagnose the tail lamps. (Refer to .)

STEP 2. Check the illumination.
When the tail lamps are turned on, check whether the illumination other than the radio and CD player is turned on.

Q. Is the check result normal?
Go to Step 3.
Replace the heater controller assembly (A/C-ECU) <Vehicles without A/C> or A/C controller assembly (A/C-ECU) <Vehicles with A/C>.

STEP 3. Connector check: C-103 radio and CD player connector, C-237 heater controller assembly (A/C-ECU) connector <vehicles without A/C> or C-216 A/C controller assembly (A/C-ECU) connector <vehicles with A/C>

Q. Is the check result normal?
Go to Step 4.
Repair the connector concerned.

STEP 4. Check the wiring harness between C-103 radio and CD player connector terminal No.29 and C-237 heater controller assembly (A/C-ECU) connector <vehicles without A/C> or C-216 A/C controller assembly (A/C-ECU) connector <vehicles with A/C> terminal No.18.

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

Q. Is the check result normal?
Go to Step 5.
Repair the wiring harness.

STEP 5. Retest the system
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?
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 radio and CD player.