Inspection Procedure 5: Communication with the Power Window Main Switch (Power Window Module) is not Possible. <Vehicles for South Africa>
















caution Whenever the ECU is replaced, ensure that the power supply circuit, the earthing circuit and the communication circuit are normal.

COMMENTS ON TROUBLE SYMPTOM
The power window main switch, the power supply circuit (power window relay driving circuit) or communication circuit for that switch may be defective.

PROBABLE CAUSES

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

DIAGNOSIS PROCEDURE

STEP 1. ECU check by using the SWS monitor
Check that the power supply and earth lines to the ETACS-ECU and the SWS communication lines are normal.

  • Ignition switch: OFF
ECUS TO BE CHECKED
  • ETACS ECU
OK: "OK" is displayed on the "ETACS ECU" menu.

Q. Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure 2 "Communication with the ETACS-ECU is not possible ."

STEP 2. SWS monitor data list
Selected item ETACS ECU
  • Ignition switch: ON
Item No.
 Item name
 Normal condition
Item 30
 IG SW(IG1)
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 3.
Diagnose the ETACS (Refer to GROUP 54A - Input signal chart ).

STEP 3. Connector check: F-02 power window main switch connector

Q. Is the check result normal?
Go to Step 4.
Repair the defective connector.

STEP 4. Voltage measurement at the F-02 power window main switch connector.
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Ignition switch: ON
(3)Voltage between F-02 power window main switch connector terminal No.6 and body earth
OK: System voltage

Q. Is the check result normal?
Go to Step 13.
Go to Step 5.

STEP 5. Connector check: D-408 power window relay connector

Q. Is the check result normal?
Go to Step 6.
Repair the defective connector.

STEP 6. Check the power window relay.
Refer to GROUP 42 - On-vehicle Service .

Q. Is the check result normal?
Go to Step 7.
Replace the power window relay.

STEP 7. Voltage measurement at D-408 power window relay connector.
(1)Remove the power window relay, and measure at the junction block side.
(2)Voltage between D-408 power window relay connector terminal No.5 and body earth
OK: System voltage

Q. Is the check result normal?
Go to Step 9.
Go to Step 8.

STEP 8. Check the wiring harness between D-408 power window relay connector terminal No.5 and fusible link (4).
note Prior to the wiring harness inspection, check intermediate connector D-238 and junction block connector D-403, and repair if necessary.

  • Check the power supply line for open circuit.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
Repair the wiring harness.

STEP 9. Resistance measurement at D-408 power window relay connector.
(1)Remove the power window relay, and measure at the junction block side.
(2)Resistance between D-408 power window relay connector terminal No.3 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Go to Step 11.
Go to Step 10.

STEP 10. Check the wiring harness between D-408 power window relay connector terminal No.3 and body earth.
note Prior to the wiring harness inspection, check junction block connector D-405, and repair if necessary.

  • Check the earth wires for open circuit.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
Repair the wiring harness.

STEP 11. Connector check: D-419 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 12.
Repair the defective connector.

STEP 12. Check the wiring harness between D-408 power window relay connector terminal No.4 and F-02 power window main switch connector terminal No.6.
note Prior to the wiring harness inspection, check intermediate connector D-114 and junction block connector D-403, and repair if necessary.

  • Check the power supply line for open circuit.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
Repair the wiring harness.

STEP 13. Resistance measurement at the F-02 power window main switch connector.
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Resistance between F-02 power window main switch connector terminal No.2 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Go to Step 15.
Go to Step 14.

STEP 14. Check the wiring harness between F-02 power window main switch connector terminal No.2 and body earth.
note Prior to the wiring harness inspection, check intermediate connector D-114, and repair if necessary.

  • Check the earth wires for open circuit.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
Repair the wiring harness.

STEP 15. Connector check: D-420 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 16.
Repair the defective connector.

STEP 16. Check the wiring harness between D-420 ETACS-ECU connector terminal No.59 and F-02 power window main switch connector terminal No.4.
note Prior to the wiring harness inspection, check intermediate connector D-114, and repair if necessary.

  • Check the communication lines for open circuit.

Q. Is the check result normal?
Go to Step 17.
Repair the wiring harness.

STEP 17. ECU check by using the SWS monitor.
Check that the power supply and earth lines to the power window main switch (power window module) and the SWS communication lines are normal.

  • Ignition switch: ON
ECUS TO BE CHECKED
  • P/W MODULE
OK: "OK" is displayed on the "P/W MODULE" menu.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
Replace the power window main switch.