INSPECTION PROCEDURE A-4: Sunroof Timer Function does not work Normally.



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 driver’s door switch
  • Malfunction of ETACS-ECU
  • Malfunction of the sunroof motor assembly (sunroof-ECU)
  • Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE


STEP 1. Check the operation condition of the sunroof.



Q. Is the check result normal?





STEP 2. Pulse check



System switch
Check conditions
Ignition switch (IG1)
When turned from ACC to ON
Driver’s door switch
When the driver’s door is opened
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)Ignition switch: ON
(3)Check the voltage between E-03 sunroof motor assembly connector terminal No.2 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.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 6. Connector check: D-420 ETACS-ECU connector


Q. Is the check result normal?





STEP 7. 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 circuit.

Q. Is the check result normal?





STEP 8. Retest the system.



(1)Replace the sunroof motor assembly.
(2)Check that the sunroof timer function works normally.

Q. Is the check result normal?