INSPECTION PROCEDURE C-4: Front and/or rear passenger’s power window(s) do not work by means of the power window main switch.


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 power window main switch
  • Malfunction of the front power window sub switch, rear power window sub switch (RH) or rear power window sub switch (LH)
  • Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE


STEP 1. Check the power window main switch.



Q. Is the check result normal?





STEP 2. Check the power window sub switch.



Q. Is the check result normal?





STEP 3. Determine a trouble spot.


Q. Which power window does not work?







STEP 4. Check of short to power supply, short to earth, and open circuit in U.AS, D.AS line between power window main switch connector and front power window sub switch connector.


Q. Is the check result normal?





STEP 5. Retest the system.


(1)Replace the front power window sub switch.
(2)Make the power widows learn their fully closed position.()
(3)Check that the front passenger’s power window works by means of the power window main switch.

Q. Is the check result normal?





STEP 6. Check of short to power supply, short to earth, and open circuit in U.RR, D.RR line between power window main switch connector and front power window sub switch connector.


Q. Is the check result normal?





STEP 7. Retest the system.


(1)Replace the rear power window sub switch (RH).
(2)Make the power widows learn their fully closed position.()
(3)Check that the rear right power window works by means of the power window main switch.

Q. Is the check result normal?





STEP 8. Check of short to power supply, short to earth, and open circuit in U.RL, D.RL line between power window main switch connector and front power window sub switch connector.


Q. Is the check result normal?





STEP 9. Retest the system.


(1)Replace the rear power window sub switch (LH).
(2)Make the power widows learn their fully closed position.()
(3)Check that the rear left power window works by means of the power window main switch.

Q. Is the check result normal?