Inspection Procedure 4: Rear Panel Power Window-ECU cannot Communicate with ETACS-ECU.


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.


COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of the rear panel power window-ECU
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code.
When the ignition switch is turned to the "ON" position, check that the ETACS-ECU does not set the diagnosis code.

Q. Is the diagnosis code set?
Refer to .
Go to Step 2.

STEP 2. Connector check: C-219 ETACS-ECU connector and D-11 rear panel power window-ECU connector




Q. Is the check result normal?

Go to Step 3.

Repair the connector.

STEP 3. Check the wiring harness between C-219 ETACS-ECU connector terminal No.54 to D-11 rear panel power window-ECU connector terminal No.14.






note Prior to the wiring harness inspection, check intermediate connector C-16, and repair if necessary.

  • Check the communication line for open circuit.

Q. Is the check result normal?

Go to Step 4.

Repair the wiring harness.

STEP 4. Check the wiring harness between D-11 rear panel power window-ECU connector terminal No.18 to fusible link (23).








note Prior to the wiring harness inspection, check intermediate connectors C-16, C-33 and relay box connector A-12, and repair if necessary.

  • Check the power supply line for open circuit.

Q. Is the check result normal?

Go to Step 5.

Repair the wiring harness.

STEP 5. Retest the system.
After the rear panel power window-ECU is replaced, check that the rear panel power window work.
(1)Replace the rear panel power window-ECU.
(2)Check that the rear panel power window work.

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 ETACS-ECU.