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.
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HOMESERVICE MANUALSLEXUS1999RX 300 AWD V6-3.0L (1MZ-FE)REPAIR AND DIAGNOSISWINDOWS AND GLASSWINDOWSPOWER WINDOW SWITCHTESTING AND INSPECTION
1999 Lexus RX 300 AWD V6-3.0L (1MZ-FE)
Power Window Switch: Testing and Inspection
1999 Lexus RX 300 AWD V6-3.0L (1MZ-FE)SECTION Testing and Inspection
INSPECT POWER WINDOW SWITCH CONTINUITY
If continuity is not as specified, replace the switch.
INSPECT POWER WINDOW SWITCH CIRCUIT
Rear LH side:
Rear RH side:
INSPECT POWER WINDOW SWITCH ILLUMINATION
Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead to terminal 2, and check that the indicator light lights up.
If operation is not as specified, replace the switch.
Driver's Door (Window Up):
INSPECT JAM PROTECTION LIMIT SWITCH OPERATION
a. Connect the negative (-) lead from the ohmmeter to terminal 4 and the positive (+) lead to terminal 5.
b. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 2.
c. Check that the continuity exists when the window goes up.
d. Check that the no continuity exists when the window is in the fully closed position.
If operation is not as specified, replace the motor.
NOTE: If connecting the wire harness wrongly, the sensor might be damaged so caution is necessary.
Driver's Door (Window Down):
INSPECT JAM PROTECTION LIMIT SWITCH OPERATION
a. Connect the negative (-) lead from the ohmmeter to terminal 4 and the positive (+) lead to terminal 5.
b. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1.
c. Check that the continuity exists when the window goes down.
d. Check that the no continuity exists when the window is in the fully opened position.
If operation is not as specified, replace the motor.
NOTE: If connecting the wire harness wrongly, the sensor might be damaged so caution is necessary.
Driver's Door:
INSPECT JAM PROTECTION LIMIT SWITCH CIRCUIT
Front Passenger's Door (Window Up):
INSPECT JAM PROTECTION LIMIT SWITCH OPERATION
a. Connect the negative (-) lead from the ohmmeter to terminal 4 and the positive (+) lead to terminal 5.
b. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1.
c. Check that the continuity exists when the window goes up.
d. Check that the no continuity exists when the window is in the fully closed position.
If operation is not as specified, replace the motor.
NOTE: If connecting the wire harness wrongly, the sensor might be damaged so caution is necessary.
Front Passenger's Door (Window Down):
INSPECT JAM PROTECTION LIMIT SWITCH OPERATION
a. Connect the negative (-) lead from the ohmmeter to terminal 4 and the positive (+) lead to terminal 5.
b. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 2.
c. Check that the continuity exists when the window goes down.
d. Check that the no continuity exists when the window is in the fully opened position.
If operation is not as specified, replace the motor.
NOTE: If connecting the wire harness wrongly, the sensor might be damaged so caution is necessary.
Passenger's Door:
INSPECT JAM PROTECTION LIMIT SWITCH CIRCUIT
Rear LH Side Door (Window Up):
INSPECT JAM PROTECTION LIMIT SWITCH OPERATION
a. Connect the positive (+) lead from the ohmmeter to terminal 2 and the negative (-) lead to terminal 6.
b. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead to terminal 1.
c. Check that the continuity exists when the window goes up.
d. Check that the no continuity exists when the window is in the fully closed position.
If operation is not as specified, replace the motor.
NOTE: If connecting the wire harness wrongly1 the sensor might be damaged so caution is necessary.
Rear LH Side Door (Window Down):
INSPECT JAM PROTECTION LIMIT SWITCH OPERATION
a. Connect the positive (+) lead from the ohmmeter to terminal 2 and the negative (-) lead to terminal 6.
b. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 3.
c. Check that the continuity exists when the window goes down.
d. Check that the no continuity exists when the window is in the fully opened position.
If operation is not as specified, replace the motor.
NOTE: If connecting the wire harness wrongly, the sensor might be damaged so caution is necessary.
Rear RH Side Door (Window Up):
INSPECT JAM PROTECTION LIMIT SWITCH OPERATION
a. Connect the positive (+) lead from the ohmmeter to terminal 2 and the negative (-) lead to terminal 6.
b. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead to terminal 1.
c. Check that the continuity exists when the window goes up.
d. Check that the no continuity exists when the window is in the fully closed position.
If operation is not as specified, replace the motor.
NOTE: If connecting the wire harness wrongly, the sensor might be damaged so caution is necessary.
Rear RH Side Door (Window Down):
INSPECT JAM PROTECTION LIMIT SWITCH OPERATION
a. Connect the positive (+) lead from the ohmmeter to terminal 2 and the negative (-) lead to terminal 6.
b. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 3.
c. Check that the continuity exists when the window goes down.
d. Check that the no continuity exists when the window is in the fully opened position.
If operation is not as specified, replace the motor.
NOTE: If connecting the wire harness wrongly, the sensor might be damaged so caution is necessary.
Driver's Door:
INSPECT JAM PROTECTION PULSE SWITCH OPERATION
a. Connect the positive (+) lead from the TOYOTA electrical tester to terminal 4 and the negative (-) lead to terminal 6.
b. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 2.
c. Check that pulse is generated during the motor running.
d. Reverse the polarity and check that pulse is generated. If operation is not as specified, replace the motor.
NOTE: If connecting the wire harness wrongly, the sensor might be damaged so caution is necessary.
Driver's Door:
INSPECT JAM PROTECTION PULSE SWITCH CIRCUIT
Front Passenger's Door:
INSPECT JAM PROTECTION PULSE SWITCH OPERATION
a. Connect the positive (+) lead from the TOYOTA electrical tester to terminal 4 and the negative (-) lead to terminal 6.
b. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1.
c. Check that pulse is generated during the motor running.
d. Reverse the polarity and check that pulse is generated.
If operation is not as specified, replace the motor.
NOTE: If connecting the wire harness wrongly, the sensor might be damaged so caution is necessary.
Front Passenger's Door:
INSPECT JAM PROTECTION PULSE SWITCH CIRCUIT
Rear LH Side Door:
INSPECT JAM PROTECTION PULSE SWITCH
a. Connect the positive (+) lead from the TOYOTA electrical tester to terminal 3 and the negative (-) lead to terminal 5.
b. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1.
c. Check that pulse is generated during the motor running.
d. Reverse the polarity and check that pulse is generated.
If operation is not as specified, replace the motor.
NOTE: If connecting the wire harness wrongly, the sensor might be damaged so caution is necessary.
Rear RH Side Door:
INSPECT JAM PROTECTION PULSE SWITCH
a. Connect the positive (+) lead from the TOYOTA electrical tester to terminal 3 and the negative (-) lead to terminal 5.
b. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 2.
c. Check that pulse is generated during the motor running.
d. Reverse the polarity and check that pulse is generated. If operation is not as specified, replace the motor.
NOTE: If connecting the wire harness wrongly, the sensor might be damaged so caution is necessary.
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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.