Inspection Procedure C-9: When the power window main switch is operated, the switch signals are not received.


caution Whenever the ECU is replaced, ensure that the input signal circuit is normal.






















COMMENTS ON TROUBLE SYMPTOM
Input signal from the power window main switch is used in order to check the power window main switch and confirm how the system is communicating with the ETACS-ECU. If the communication line is defective, the power windows will not work normally.

PROBABLE CAUSES

  • Malfunction of the power window main switch
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the operation by using the power window main switch.
Check if each window can be operated by means of the power window main switch.

Q. Can each power window be operated by means of the power window main switch?
Go to Step 2.
Go to Step 5.

STEP 2. Connector check: D-420 ETACS-ECU connector, F-02 power window main switch connector

Q. Is the check result normal?
Go to Step 3.
Repair the defective connector.

STEP 3. 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-133 <LH drive vehicles> or D-114 <RH drive vehicles>, and repair if necessary.

  • Check the communication lines for open and short circuit.

Q. Is the check result normal?
Go to Step 4.
Repair the wiring harness.

STEP 4. Replace the power window main switch, and then retest the system.
Replace the power window main switch, and check that the power window main switch signal is received.
(1)Replace the power window main switch.
(2)Check that the power window main switch signal is received.

Q. Is the check result normal?
The procedure is complete.
Replace the ETACS-ECU.

STEP 5. Voltage measurement at F-02 power window main switch connector.
(1)Remove the power window main switch, and measure at the wiring harness side.
(2)Turn the ignition switch to the ON position.
(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 8.
Go to Step 6.

STEP 6. Connector check: D-408 power window relay connector

Q. Is the check result normal?
Go to Step 7.
Repair the defective connector.

STEP 7. 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-133 <LH drive vehicles> or D-114 <RH drive vehicles> 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 Cope with Intermittent Malfunction ).
Repair the wiring harness.

STEP 8. Resistance measurement at F-02 power window main switch connector.
(1)Remove the power window main switch, 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 10.
Go to Step 9.

STEP 9. 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-133 <LH drive vehicles> or D-114 <RH drive vehicles>, 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 Cope with Intermittent Malfunction ).
Repair the wiring harness.

STEP 10. Retest the system.
Check that each switch signal is received by operating the power window main switch.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the power window main switch.