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Home >> Lexus >> 2003 >> RX 300 FWD >> Repair and Diagnosis >> Body & Frame >> Power Windows >> Component Tests >> Power Window Motor PTC Thermistor (Driver)

Power Window Motor PTC Thermistor (Driver)

  1. Disconnect the connector from the power window motor.
  2. Connect the positive (+) lead from the ammeter to terminal No. 1 on the wiring harness side connector and the negative (-) lead to negative terminal of the battery. See CONNECTOR IDENTIFICATION .
  3. Connect the positive (+) lead from the battery to terminal No. 2 on the wiring harness side connector, and raise the window to the fully closed position.
  4. Continue to apply voltage, and check that the current changes to less than 1 amp within 4-90 seconds.
  5. Disconnect the leads from the terminals.
  6. Approximately 60 seconds later, connect the positive (+) lead from the battery to terminal No. 1 and negative (-) lead to terminal No. 2, and check that the window begins to descend. If operation is not as specified, replace the motor. See WINDOW REGULATOR (FRONT DOOR)  under REMOVAL & INSTALLATION.