ES300 1992-1997

Moonroof

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Power Moonroof



Diagnosis & Testing
Motor

Specific to:

Lexus ES300 1992-1996

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Inspect sliding roof motor operation:
    1. Connect the positive lead from the battery to terminal 3 and the negative lead to terminal 1, check that the motor turns to counterclockwise (moves of the close side).

      Click image to see an enlarged view

      Fig. Connect the positive lead from the battery to terminal 3 and the negative lead to terminal 1

    2.  
    3. Reverse the polarity, check that the motor turns to clockwise (moves to the open side). If operation is not as specified, replace the motor.

      Click image to see an enlarged view

      Fig. Reverse the polarity

    4.  

  4.  
  5. Inspect circuit breaker operation:
    1. With the sliding roof in the fully opened position, hold the sliding roof switch in -OPEN- position and check that there is a circuit breaker operation noise within 10 to 60 seconds.
    2.  
    3. With the sliding roof in fully opened position, hold the sliding roof switch in -CLOSE- position and check that the sliding roof begins to close within 60 seconds. If operation is not as specified, replace the motor.

      Click image to see an enlarged view

      Fig. Circuit breaker testing

    4.  

  6.  
  7. Disconnect the connector from the sliding roof motor and inspect the connector on the wire harness side.
  8.  
  9. If the circuit is not as specified, refer to the wiring diagram and inspect the circuits connected to other parts.

    Click image to see an enlarged view

    Fig. Motor circuit testing



    Click image to see an enlarged view

    Fig. Motor circuit testing wire harness side

  10.  

Specific to:

Lexus ES300 1997-1999

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Inspect sliding roof motor operation:
    1. Connect the positive lead from the battery to terminal 1 and the negative lead to terminal 2, check that the motor turns counterclockwise (moves of the close and up side).

      Click image to see an enlarged view

      Fig. Connect the positive lead from the battery to terminal 1 and the negative lead to terminal 2

    2.  
    3. Reverse the polarity, check that the motor turns clockwise. (moves to the open and down side).
    4.  
    5. If operation is not as specified, replace the motor.

      Click image to see an enlarged view

      Fig. Reverse the polarity

    6.  

  4.  
  5. Inspect sliding roof motor and limit switch circuit:
    1. Disconnect the connector from the limit switch and inspect the connector on the wire harness side.
    2.  
    3. If the circuit is not as specified, inspect the circuits connected to other parts:

      Tester Connection: 3-Ground, Condition: Constant, Specified Condition: Continuity
       
      Tester Connection: 4-Ground, Condition: Constant, Specified Condition: Continuity

      Click image to see an enlarged view

      Fig. Sliding roof motor and limit switch, wire harness side

       

    4.  

  6.  

Switch

Specific to:

Lexus ES300 1992-1996

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Inspect the switch continuity between terminals. If continuity is not as specified, replace the switch.

    Click image to see an enlarged view

    Fig. Switch pinout



    Click image to see an enlarged view

    Fig. Switch continuity testing

  4.  
  5. Inspect sliding roof switch circuit:
    1. Disconnect the connector from the sliding roof switch and inspect the connector on the wire harness side.

      Click image to see an enlarged view

      Fig. Switch circuit testing



      Click image to see an enlarged view

      Fig. Sliding roof switch, wire harness side

    2.  
    3. If the circuit is as specified, inspect the circuit connected to others parts.
    4.  

  6.  
  7. Inspect sliding roof control relay circuit:
    1. Disconnect the connector from the relay and inspect the connector on the wire harness side.

      Click image to see an enlarged view

      Fig. Control relay circuit testing, part 1



      Click image to see an enlarged view

      Fig. Control relay circuit testing, part 2



      Click image to see an enlarged view

      Fig. Control relay, wire harness side

    2.  

  8.  
  9. Inspect sliding roof limit switch continuity.
  10.  
  11. If continuity is not as specified, replace the switch.

    Click image to see an enlarged view

    Fig. Limit switch



    Click image to see an enlarged view

    Fig. Limit switch continuity testing

  12.  
  13. Inspect limit switch circuit:
    1. Disconnect the connector from the limit switch and inspect the connector on the wire harness side.
    2.  
    3. If the circuit is as specified, inspect the circuit connected to others parts.

      Click image to see an enlarged view

      Fig. Limit switch circuit testing



      Click image to see an enlarged view

      Fig. Limit switch, wire harness side

    4.  

  14.  

Specific to:

Lexus ES300 1997-1998

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Inspect sliding roof control relay and switch circuit:
    1. Disconnect the connector from the relay and switch and inspect the connector on the wire harness side, as shown in the chart.

      Click image to see an enlarged view

      Fig. Sliding roof control relay and switch circuit testing



      Click image to see an enlarged view

      Fig. Sliding roof control relay and switch, wire harness side

    2.  

  4.  
  5. Inspect sliding roof limit switch continuity.
  6.  
  7. If continuity is not as specified, replace the switch.

    Click image to see an enlarged view

    Fig. Limit switch



    Click image to see an enlarged view

    Fig. Limit switch continuity testing

  8.  

Removal & Installation
Motor

Specific to:

Lexus ES250 1990-1991

Lexus ES300 1992-1999

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove garnishes, visors, and assist grips, as necessary to access the front headliner.
  6.  
  7. Pull down front headliner to access sunroof drive motor.
  8.  
  9. Disconnect the drive motor connector.
  10.  
  11. Remove the bolts and drive motor.
  12.  
  13. If necessary, remove the screw and cam plate cover.

    Click image to see an enlarged view

    Fig. Moonroof motor removal-1990-91 models



    Click image to see an enlarged view

    Fig. Moonroof motor removal-1992-96 models



    Click image to see an enlarged view

    Fig. Moonroof motor removal-1997-99 models

  14.  

To install:

  1. Installation is the reverse of the removal procedure.
    1. If removed, install the cam plate cover by turning the drive gear to align the point marks.
    2.  
    3. Ensure the drive gear and sliding roof position are matched.
    4.  

  2.  

Switch

Specific to:

Lexus ES250 1990-1991

Lexus ES300 1992-1999

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Disconnect the connector and remove the control switch.

    Click image to see an enlarged view

    Fig. Sliding roof switch removal-1991 models, other models similar

  6.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  

Reset/Initialization Procedure
  1. Initialize the sliding roof system.
    1. Turn the ignition switch to the ON position.
    2.  
    3. Using the tilt up switch, tilt the roof fully upward, and then using the slide open switch, tilt the roof fully downward.
    4.  
    5. Using the slide open switch, fully open the roof, and then using the tilt up switch, fully close it.
    6.  

  2.  

 
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