Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Power Window Regulator Motor: Inspection
- INSPECT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (DRIVER SIDE)
- Check operation of the regulator motor.NOTE: Do not apply battery voltage to any terminal except 1 and 2.
- Apply battery voltage to the motor terminals.
- Check that the motor rotates smoothly.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK
POWER WINDOW REGULATOR MOTOR MEASUREMENT CONDITION AND SPECIFIED CONDITION REFERENCE (DRIVER SIDE)Measurement Condition Specified Condition Battery Positive (+) → Terminal 1 (D)
Battery Negative (-) → Terminal 2 (U)Motor gear rotates clockwise Battery Positive (+) → Terminal 2 (U)
Battery Negative (-) → Terminal 1 (D)Motor gear rotates counterclockwise If the result is not as specified, replace the motor.
- Check operation of the PTC inside the regulator motor.NOTE: Work must be performed with the power window regulator and door glass installed to the vehicle.
- Set an electrical tester DC 400 A probe to the wire harness of terminal 2.NOTE: Match the arrow mark of the probe with the current direction.
- Fully close the door glass by operating the power window switch and keep the door glass there for approximately 60 seconds.
- With the door glass fully closed, operate the power window switch in the closing direction again. Check how long the current takes to change from a range of 16 A to 34 A, to less than 1 A.
Standard:
4 to 90 seconds
- Check that the door glass moves down when the power window regulator switch is pushed DOWN.
If the result is not as specified, replace the motor.
- Set an electrical tester DC 400 A probe to the wire harness of terminal 2.
- Check operation of the regulator motor.
- INSPECT POWER WINDOW REGULATOR MOTOR ASSEMBLY RH
- Check operation of the regulator motor.NOTE: Do not apply battery voltage to any terminal except 1 and 2.
- Apply battery voltage to the motor terminals.
- Check that the motor rotates smoothly.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK
POWER WINDOW REGULATOR MOTOR MEASUREMENT CONDITION AND SPECIFIED CONDITION REFERENCE (RH)Measurement Condition Specified Condition Battery Positive (+) → Terminal 2 (U)
Battery Negative (-) → Terminal 1 (D)Motor gear rotates clockwise Battery Positive (+) → Terminal 1 (D)
Battery Negative (-) → Terminal 2 (U)Motor gear rotates counterclockwise If the result is not as specified, replace the motor.
- Check operation of the PTC inside the regulator motor.NOTE: Work must be performed with the power window regulator and door glass installed to the vehicle.
- Set an electrical tester DC 400 A probe to the wire harness of terminal 2.NOTE: Match the arrow mark of the probe with the current direction.
- Fully close the door glass by operating the power window switch and keep the door glass there for approximately 60 seconds.
- With the door glass fully closed, operate the power window switch in the closing direction again. Check how long the current takes to change from a range of 16 A to 34 A, to less than 1 A.
Standard:
4 to 90 seconds
- Check that the door glass moves down when the power window regulator switch is pushed DOWN.
If the result is not as specified, replace the motor.
- Set an electrical tester DC 400 A probe to the wire harness of terminal 2.
- Check operation of the regulator motor.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.