INSPECTION PROCEDURE A-1: The Sunroof does not work at All.


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




















COMMENTS ON TROUBLE SYMPTOM



POSSIBLE CAUSES



  • Malfunction of the sunroof switch
  • Malfunction of the sunroof motor assembly (sunroof-ECU)
  • Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE


STEP 1. Check the power window main switch.



Q. Is the check result normal?





STEP 2. Pulse check



System switch
 Check conditions
Ignition switch (IG1)
 When turned from ACC to ON
sunroof switch
 When the sunroof switch is opened or closed
OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Are the check result normal?







STEP 3. Connector check: E-03 sunroof motor assembly connector


Q. Is the check result normal?





STEP 4. Voltage measurement at the E-03 sunroof motor assembly connector.


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

Q. Is the check result normal?





STEP 5. Check the wiring harness between E-03 sunroof motor assembly connector terminal No.1 and the fusible link (4).


note Prior to the wiring harness inspection, check intermediate connectors D-130 and D-238, and repair if necessary.

  • Check the power supply line for open circuit.

Q. Is the check result normal?





STEP 6. Voltage measurement at the E-03 sunroof motor assembly connector.


(1)Disconnect the sunroof motor assembly connector, and measure at the harness side.
(2)Ignition switch: ON
(3)Check the voltage between the E-03 sunroof motor assembly connector terminal No.2 and body earth.
OK: System voltage

Q. Is the check result normal?





STEP 7. Check the wiring harness between E-03 sunroof motor assembly connector terminal No.2 and the ignition switch (IG2).


note Prior to the wiring harness inspection, check junction block connectors D-403, D-410, intermediate connector D-130, and repair if necessary.

  • Check the power supply line for open circuit.

Q. Is the check result normal?





STEP 8. Voltage measurement at the E-03 sunroof motor assembly connector.


(1)Disconnect the sunroof motor assembly connector, and measure at the harness side.
(2)Ignition switch: ON
(3)Check the voltage between the E-03 sunroof motor assembly connector terminal No.3 and body earth.
OK: System voltage

Q. Is the check result normal?





STEP 9 Check the wiring harness between E-03 sunroof motor assembly connector terminal No.2 and the fusible link (1).


note Prior to the wiring harness inspection, check joint connector (4) D-34, intermediate connectors D-130, D-241, and repair if necessary.

  • Check the power supply line for open circuit.

Q. Is the check result normal?





STEP 10. Resistance measurement at the E-03 sunroof motor assembly connector.


(1)Disconnect the sunroof motor assembly connector, and measure at the harness side.
(2)Check the resistance between E-03 sunroof motor assembly connector terminal No.5 and body earth.
OK: Continuity (less than 2Ω)

Q. Is the check result normal?





STEP 11. Check the wiring harness between E-03 sunroof motor assembly connector terminal No.5 and body earth.



  • Check body earth line for open circuit.

Q. Is the check result normal?





STEP 12. Retest the system.



Q. Is the check result normal?