Inspection Procedure 5: 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



  • 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



PROBABLE CAUSES



  • Malfunction of combination meter
  • Malfunctions of centre panel unit
  • Malfunctions of radio and CD player
  • 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 combination meter.
Check whether the combination meter works normally.

Q. Is the check result normal?
Go to Step 3.
Diagnose the combination meter (Refer to ).

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?
Diagnose the combination meter (Refer to ).
Go to Step 4.

STEP 4. Connector check: C-01 combination meter connector, C-10 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-01 combination meter connector terminal No.23 and C-10 centre panel unit connector terminal No.16.
note Prior to the wiring harness inspection, check A/C control panel connector C-119 <Vehicle with A/C> or heater control panel C-147 <Vehicle without A/C> and joint connector C-46 <RHD>, and repair if necessary.

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

Q. Is the check result normal?
Go to Step 6.
Repair the wiring harness.

STEP 6. Connector check: C-119 A/C control panel connector <Vehicle with A/C> or C-147 heater control panel <vehicle without A/C>

Q. Is the check result normal?
Go to Step 7.
Repair the connector concerned.

STEP 7. Check the wiring harness between C-01 combination meter connector terminal No. 22 and C-119 A/C control panel connector terminal No.8 <Vehicle with A/C> or C-147 heater control panel terminal No.8 <vehicle without A/C>.

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

Q. Is the check result normal?
Go to Step 8.
Repair the wiring harness.

STEP 8. Check the wiring harness between C-10 centre panel unit connector terminal No.10 and C-119 A/C control panel connector terminal No.10 <Vehicle with A/C> or C-147 heater control panel terminal No.10 <vehicle without A/C>.
note Prior to the wiring harness inspection, joint connector C-46 <RHD>, and repair if necessary.

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

Q. Is the check result normal?
Go to Step 9.
Repair the wiring harness.

STEP 9. Connector check: C-105 radio and CD player connector

Q. Is the check result normal?
Go to Step 10.
Repair the connector concerned.

STEP 10. Check the wiring harness between C-105 radio and CD player connector terminal No.9 and C-10 centre panel unit connector terminal No.4.

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

Q. Is the check result normal?
Go to Step 11.
Repair the wiring harness.

STEP 11. Replace the A/C control panel connector <Vehicle with A/C> heater control panel <vehicle without A/C> temporarily, and check the trouble symptom.
Replace the A/C control panel connector <Vehicle with A/C> heater control panel <vehicle without A/C> temporarily, and check that the audio illumination works normally.

Q. Is the check result normal?
Replace the A/C control panel connector <Vehicle with A/C> heater control panel <vehicle without A/C>.
Go to Step 12.

STEP 12. 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 radio and CD player.