Inspection Procedure 4: Communication with the Sunroof Motor Assembly (Sunroof-ECU) is not Possible. <vehicles with sunroof>






















caution Whenever the ECU is replaced, ensure that the power supply circuit, the grounding circuit and the communication circuit are normal.

COMMENTS ON TROUBLE SYMPTOM
The sunroof motor assembly, the power supply circuit or the communication circuit for that assembly may be defective.

PROBABLE CAUSES

  • Malfunction of the sunroof motor assembly
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. ECU check on the SWS monitor
Check that the power supply and earth lines to the ETACS-ECU and the SWS communication lines are normal.

  • Ignition switch: OFF
ECUS TO BE CHECKED
  • ETACS ECU
OK: "OK" is displayed on the "ETACS ECU" menu.

Q. Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure 2 "Communication with the ETACS-ECU is not possible ."

STEP 2. Connector check: E-03 sunroof motor assembly connector

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

STEP 3. Voltage measurement at E-03 sunroof motor assembly connector.
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Voltage between E-03 sunroof motor assembly connector terminal No.1 and body earth
(3)OK: System voltage

Q. Is the check result normal?
Go to Step 5.
Go to Step 4.

STEP 4. Check the wiring harness between E-03 sunroof motor assembly connector terminal No.1 and fusible link (4).
note Prior to the wiring harness inspection, check intermediate connectors D-130, D-238, and repair if necessary.

  • Check the power supply line for open circuit.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
Repair the wiring harness.

STEP 5. Voltage measurement at E-03 sunroof motor assembly connector.
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Turn the ignition switch to the ON position.
(3)Voltage between E-03 sunroof motor assembly connector terminal No.2 and body earth
OK: System voltage

Q. Is the check result normal?
Go to Step 7.
Go to Step 6.

STEP 6. Check the wiring harness between E-03 sunroof motor assembly connector terminal No.2 and ignition switch (IG2).
note Prior to the wiring harness inspection, check intermediate connector D-130, junction block connectors D-403 and D-410, and repair if necessary.

  • Check the power supply line to the ignition switch (IG2) for open circuit.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
Repair the wiring harness.

STEP 7. Resistance measurement at E-03 sunroof motor assembly connector.
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Continuity between E-03 sunroof motor assembly connector terminal No.5 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Go to Step 9.
Go to Step 8.

STEP 8. Check the wiring harness between E-03 sunroof motor assembly connector terminal No.5 and body earth.

  • Check the earth wires for open circuit.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
Repair the wiring harness.

STEP 9. Connector check: D-420 ETACS-ECU connector

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

STEP 10. Check the wiring harness between E-03 sunroof motor assembly connector terminal No.10 and D-420 ETACS-ECU connector terminal No.59.
note Prior to the wiring harness inspection, check intermediate connector D-130, and repair if necessary.

  • Check the communication lines for open and short circuit.

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

STEP 11. ECU check on the SWS monitor
Check that the power supply and earth lines to the sunroof motor assembly and the SWS communication lines are normal.

  • Turn the ignition switch to the ON position.
ECUS TO BE CHECKED
  • SUNROOF ECU
OK: "OK" is displayed on the "SUNROOF ECU" menu.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
Replace the sunroof motor assembly.