Inspection Procedure 1: Power windows do not work at all.



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 power window relay
  • Malfunction of the power window main switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. Check the power supply system.




  • Hazard warning lamp

Q. Is the check result normal?





STEP 2. M.U.T.-III diagnosis code



Q. Is the diagnosis code set?





STEP 3. M.U.T.-III data list




  • electric motor switch: ON
Item No.
Item name
Normal condition
30
IG SW (IG1) /Power SW(ON)
ON
OK: Normal condition is displayed.

Q. Is the check result normal?





STEP 4. Connector check: B-30 power window relay connector


Q. Is the check result normal?





STEP 5. Check the power window relay.



Q. Is the check result normal?





STEP 6. Voltage measurement at the B-30 power window relay connector.


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Turn the electric motor switch to the ON position.
(3)Check the voltage between the B-30 power window relay connector terminal No.3 and body earth.
OK: System voltage

Q. Is the check result normal?





STEP 7. Check the wiring harness between B-30 power window relay connector terminal No.3 and fusible link (5).


note Prior to the wiring harness inspection, check intermediate connector B-28, and repair if necessary.

  • Check the power supply line for open circuit.

Q. Is the check result normal?





STEP 8. Voltage measurement at the B-30 power window relay connector.


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Turn the electric motor switch to the ON position.
(3)Check the voltage between the B-30 power window relay connector terminal No.4 and body earth.
OK: System voltage

Q. Is the check result normal?





STEP 9. Connector check: B-317 ETACS-ECU connector


Q. Is the check result normal?





STEP 10. Check the wiring harness between B-317 ETACS-ECU connector terminal No.59 and B-30 power window relay connector terminal No.4.



  • Check the power supply line for open circuit.

Q. Is the check result normal?





STEP 11. Resistance measurement at the B-30 power window relay connector.


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Continuity between B-30 power window relay connector terminal No.2 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?





STEP 12. Check the wiring harness between B-30 power window relay connector terminal No.2 and body earth.


note Prior to the wiring harness inspection, check earth connector B-25 <LHD>, joint connector (3) B-02, and repair if necessary.

  • Check the earth wires for open circuit.

Q. Is the check result normal?





STEP 13. Voltage measurement at the B-30 power window relay connector.


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Turn the electric motor switch to the ON position.
(3)Check the voltage between the B-30 power window relay connector terminal No.1 and body earth.
OK: System voltage

Q. Is the check result normal?





STEP 14. Connector check: B-03 joint connector (2)


Q. Is the check result normal?





STEP 15. Check the wiring harness between B-30 power window relay connector terminal No.1 and B-03 joint connector (2) terminal No.12.



  • Check the power supply line for open circuit.

Q. Is the check result normal?





STEP 16. Resistance measurement at the D-02 power window main switch connector.


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Check the resistance between D-02 power window main switch connector terminal No.8 <LHD> and body earth.
OK: Continuity exists (2 Ω or less)
(3)Check the resistance between D-02 power window main switch connector terminal No.2 <RHD> and body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?







STEP 17. Check the wiring harness between D-02 power window main switch connector terminal No.8 <LHD> and body earth.


note Prior to the wiring harness inspection, check earth connector B-25, intermediate connector B-22, and repair if necessary.

  • Check the earth wires for open circuit.

Q. Is the check result normal?





STEP 18. Check the wiring harness between D-02 power window main switch connector terminal No.2 <RHD> and body earth.


note Prior to the wiring harness inspection, check joint connector (3) B-02, intermediate connector B-109, and repair if necessary.

  • Check the earth wires for open circuit.

Q. Is the check result normal?





STEP 19. Retest the system.


(1)Replace the power window main switch.
(2)Check that the all power windows work normally.

Q. Is the check result normal?