1.CHECK POWER WINDOW MAIN SWITCH POWER SUPPLY

1. Turn ignition switch ON.
2. Check voltage between power window main switch harness connector and ground.

   (+) | (−) | Voltage (V) (Approx.)
   Power window main switch
   Connector | Terminal
   D8 | 2 | Ground | Battery voltage

Is the inspection result normal?
YES>>Power window main switch power supply is OK.
NO>>GO TO 2.
2.CHECK POWER WINDOW MAIN SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.
2. Disconnect power window main switch connector and BCM connector.
3. Check continuity between power window main switch harness connector and BCM harness connector.

   BCM | Power window main switch | Continuity
   Connector | Terminal | Connector | Terminal
   M118 | 3 | D8 | 2 | Existed

4. Check continuity between BCM harness connector and ground.

   BCM | Ground | Continuity
   Connector | Terminal
   M118 | 3 | Not existed

Is the inspection result normal?
YES>>Replace BCM. Refer to Removal and Installation.
NO>>Repair or replace harness.