INSPECTION PROCEDURE 1: Sunroof does not work at All.


caution Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.














COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of the sunroof motor assembly
  • Malfunction of the sunroof switch
  • Damaged wiring harness and connectors

DIAGNOSTIC PROCEDURE


STEP 1. M.U.T.-III diagnosis code



Q. Is the diagnosis code set?





STEP 2. Connector check: D-03 sunroof switch connector


Q. Is the check result normal?





STEP 3. Sunroof switch check



Q. Is the sunroof switch normal?





STEP 4. Resistance measurement at D-03 sunroof switch connector


(1)Disconnect the connector, and measure the resistance at the wiring harness-side connector.
(2)Measure the resistance at the D-03 sunroof switch connector terminal No. 4 and the body earth.
OK: Continuity (less than 2 Ω)

Q. Is the check result normal?





STEP 5. Check of the wiring harness between the D-03 sunroof switch connector terminal No. 4 and the D-04 sunroof motor assembly connector terminal No. 1



  • Check the earth line for open circuit or short circuit.

Q. Is the check result normal?





STEP 6. Connector check: D-04 sunroof motor assembly connector


Q. Is the check result normal?





STEP 7. Resistance measurement at D-04 sunroof motor assembly connector


(1)Disconnect the connector, and measure the resistance at the wiring harness-side connector.
(2)Measure the resistance at the D-04 sunroof motor assembly connector terminal No. 2 and the body earth.
OK: Continuity (less than 2 Ω)

Q. Is the check result normal?





STEP 8. Check of the wiring harness between the D-04 sunroof motor assembly connector terminal No. 2 and the body earth



  • Check the earth line for open circuit or short circuit.

Q. Is the check result normal?





STEP 9. Voltage measurement at D-04 sunroof motor assembly connector


(1)Disconnect the connector, and measure the voltage at the wiring harness-side connector.
(2)Measure the voltage at the D-04 sunroof motor assembly connector terminal No. 6 and the body earth.
(3)OK: Battery positive voltage

Q. Is the check result normal?





STEP 10. Check of the wiring harness between the D-04 sunroof motor assembly connector terminal No. 6 and the fusible link (33)


note Prior to the wiring harness inspection, check the C-309 and C-316 ETACS-ECU connectors, and repair if necessary.

  • Check the power supply line for open circuit and short circuit.

Q. Is the check result normal?





STEP 11. Voltage measurement at D-04 sunroof motor assembly connector


(1)Disconnect the connector, and measure the voltage at the wiring harness-side connector.
(2)Turn the ignition switch ON position.
(3)Measure the voltage at the D-04 sunroof motor assembly connector terminal No. 3 and the body earth.
(4)OK: Battery positive voltage

Q. Is the check result normal?





STEP 12. Check of the wiring harness between the D-04 sunroof motor assembly connector terminal No. 1 and the ignition switch (IG1).


note Prior to the wiring harness inspection, check the C-317 ETACS-ECU connector and C-40 intermediate connector, and repair if necessary.

  • Check the power supply line for open circuit and short circuit.

Q. Is the check result normal?





STEP 13. Retest the system.



Q. Is the check result normal?