2. None Of The Windows Open Or Close

CIRCUIT OPERATION
Power is supplied to the FRONT-ECU when the ignition switch is turned ON. Then the power window relay is in the ON state, which supplies power to each power window (main and sub) switch.

TECHNICAL DESCRIPTION (COMMENT)
The cause may be a malfunction of the FRONT-ECU and power window relay power supply or of the ground circuit.

TROUBLESHOOTING HINTS
- Malfunction of the power window relay
- Malfunction of the FRONT-ECU
- Damaged harness wires or connectors

DIAGNOSIS
Required Special Tool:
MB991223: Harness Set




STEP 1. Check the power supply line at the FRONT-ECU connector A-09X.
1. Remove the FRONT-ECU and measure at the harness side.
2. Measure the voltage between terminal 15 and ground when the ignition switch (IG2) is turned ON.
- Voltage should be approximately 12 volts (battery positive voltage).
If not approximately 12 volts, go to Step 2. If approximately 12 volts, go to Step 3.




STEP 2. Check the harness wires between ignition switch (IG2) and FRONT-ECU connector A-09X.
If any harness wire between fusible link number 1 and data link connector C-23 is damaged, repair it.
Then go to Step 4












NOTE: After inspecting intermediate connector C-66, C-73 or C-84, inspect the wire. If intermediate connector C-66, C-73 or 0-84 is damaged, repair or replace it. Refer to Harness Connector Inspection. Then go to Step 10.

STEP 3. Check the power window relay continuity.
1. Remove the power window relay.







2. Check the continuity when the system voltage is applied or not applied to the power window relay between terminal number 1 and 3.
If the power window relay is damaged, replace it. Then go to Step 10.
If the power window relay is not damaged, go to Step 4.




STEP 4. Check the power supply line at the power window relay connector A-04X.
Measure at the harness side the voltage between terminal 1 and ground, and between terminal 5 and ground.
- Voltage should be approximately 12 volts (battery positive voltage).
If not approximately 12 volts, go to Step 5. If approximately 12 volts, go to Step 6.




STEP 5. Check the harness wires between fusible link number 3 and power window relay connector A-04X.
If any harness wire between fusible link number 3 and power window relay connector A-04X is damaged, repair it. Then go to Step 4.




STEP 6. Check the harness wires between power window relay connector A-04X and FRONT-ECU connector A-09X.
If any harness wire between power window relay connector A-04X and FRONT-ECU connector A-09X is damaged, repair it. Then go to Step 10.
If the harness wires are not damaged, go to Step 7.







STEP 7. Check the harness wires between power window relay connector A-04X and intermediate connector C-66.
If any harness wires between power window relay connector A-04X and intermediate connector 0-66 is damaged, repair it. Then go to Step 10.
If the harness wires are not damaged, go to Step 8.




STEP 8. Check the harness wires between FRONT-ECU connector A-09X and ground.
If any harness wire between FRONT-ECU connector A-09X and ground is damaged, repair it. Then go to Step 10. If the harness wires are not damaged, replace the FRONT-ECU. Then go to Step 9.




STEP 9. Check the harness wires between power window main switch connector E-16 and ground.
1. Remove the power window main switch.
2. Check the harness wires between power window main switch connector E-16 and ground.
If any harness wire between power window main switch connector E-16 and ground is damaged, repair it. Then go to Step 10.
If the harness wires are not damaged, replace the power window main switch. Then go to Step 10.






NOTE: After inspecting intermediate connector C-68, inspect the wire. If intermediate connector C-68 is damaged, repair or replace it. Refer to Harness Connector Inspection. Then go to Step 10.

STEP 10. Check symptoms
Confirm that the intermediate connectors, the harness wires, power window relay, the power window main switch and the FRONT-ECU are normal.