Inspection Procedure 2: Check the Centre Display Unit Power Supply Circuit.


caution Whenever the centre display unit is replaced, ensure that the communication circuit is normal.








COMMENTS ON TROUBLE SYMPTOM



POSSIBLE CAUSES



  • Malfunction of the centre display unit
  • Damaged wiring harness and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the following connector: D-106 centre display unit connector

Q. Is the check result normal?
Go to Step 2.
Repair the defective connector.

STEP 2. Measure the voltage at D-106 centre display unit connector.


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Turn the Ignition switch to the "LOCK" (OFF) position.
(3)Voltage between D-106 centre display unit connector terminal No.10 and body earth
OK: System voltage

Q. Is the check result normal?
Go to Step 4.
Go to Step 3.

STEP 3. Check the harness wire between battery (fusible link No.1) and D-106 centre display unit connector terminal No.10.
note Prior to the wiring harness inspection, check intermediate connector D-241, and repair if necessary.

  • Check the battery power supply open circuit and short circuit.

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

STEP 4. Measure the voltage at D-106 centre display unit connector.


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Turn the ignition switch to the "ACC" position.
(3)Voltage between D-106 centre display unit connector terminal No.13 and body earth
OK: System voltage

Q. Is the check result normal?
Go to Step 6.
Go to Step 5.

STEP 5. Check the harness wire between ignition switch (ACC) and D-106 centre display unit connector terminal No.13.
note Prior to the wiring harness inspection, check intermediate connectors D-238 and D-241, and repair if necessary.

  • Check the ACC power supply open circuit and short circuit.

Q. Is the check result normal?
Refer to Inspection procedure 2 "Malfunction of the ignition switch power supply system ."
Repair the wiring harness.

STEP 6. Measure the resistance at D-106 centre display unit connector.


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Resistance between D-106 centre display unit connector terminal No.1 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Go to Step 8.
Go to Step 7.

STEP 7. Check the harness wire between D-106 centre display unit connector terminal No.1 and body earth.

  • Check the earth wires for open circuit.

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

STEP 8. Replace the centre display unit temporarily and retest the system.
Check that the centre display correctly when the centre display unit is replaced temporarily.

Q. Is the check result normal?
Replace the centre display unit.
Go to Step 9.

STEP 9. Retest the system.
Check that the centre display unit correctly.

Q. Is the check result normal?
The procedure is complete.
Return to Step 1.