Lexus GS, SC 1998-06

Convertible Tops

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Power Convertible Top



Diagnosis & Testing
Checking Wire Harness For Open Circuit (Sliding Roof Control Ecu)
  1. Disconnect the S21 (left), or S20 (right) ECU connector.
  2.  
  3. Disconnect the R16 (left), or R17 (right) drive gear connector.
  4.  
  5. Measure the resistance of the wire harness side connectors. The resistance values are as follows:

    Connector terminal 2 (S21 or S20) and connector terminal 1 (R17), or 3 (R16): Below 1 ohm
     
    Connector terminal 6 (S21 or S20) and connector terminal 3 (R17), or 1 (R16): Below 1 ohm
     

  6.  
  7. If the resistance values do not match, repair or replace the harness and connector.
  8.  

Checking Wire Harness For Short Circuit (Sliding Roof Control Ecu)


Click image to see an enlarged view

Fig. Wiring diagram for right side sliding roof drive gear assembly and control ECU.-SC 430



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Fig. Wiring diagram for left side sliding roof drive gear assembly and control ECU.-SC 430



Click image to see an enlarged view

Fig. Right side sliding roof drive gear assembly and control ECU connectors.-SC 430



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Fig. Left side sliding roof drive gear assembly and control ECU connectors.-SC 430

  1. Disconnect the S21 (left), or S20 (right) ECU connector.
  2.  
  3. Disconnect the R16 (left), or R17 (right) drive gear connector.
  4.  
  5. Measure the resistance of the wire harness side connector (S21 or S20). The resistance values are as follows:

    Connector terminal 2 and connector terminal 6: 10k ohms or higher
     
    Connector terminal 2 and body ground: 10k ohms or higher
     
    Connector terminal 6 and body ground: 10k ohms or higher
     

  6.  
  7. If the resistance values do not match, repair or replace the harness and connector.
  8.  

Motor (Left & Right Side)
  1. Remove the sliding roof drive gear motor (left or right).

    Click image to see an enlarged view

    Fig. Checking that the convertible top motor (sliding roof drive gear assembly) turns.-SC 430

  2.  
  3. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 3.
  4.  
  5. Check that the motor turns clockwise.
  6.  
  7. Then, reverse the polarity, check that the motor turns the opposite way (counterclockwise).
  8.  
  9. If the motor does not turn replace the motor.
  10.  

Removal & Installation
Motor (Sliding Roof Drive Gear Assembly)
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Disconnect the negative battery cable. Wait 90 seconds before doing any further work while the airbag system de-energizes.

    Click image to see an enlarged view

    Fig. Luggage compartment trim side cover (right side shown).-SC 430

  4.  
  5. Remove right luggage compartment trim side cover as follows:


    1. Using a clip remover, remove the 4 clips.
    2.  
    3. Using a screwdriver, detach the claw labeled A and claw labeled B, and remove the trim cover. Be sure to tape the screwdriver tip before use.
    4.  
    5. Perform this same procedure for the left side.
    6.  

  6.  
  7. Remove the right roof panel link sub-assembly as follows:


    1. Disconnect the connector.
    2.  
    3. Using a T40 torx wrench, remove the 2 screws and nut.

      Click image to see an enlarged view

      Fig. Roof panel link and shims.-SC 430

    4.  
    5. Move the roof panel link and shims just enough to gain clearance to remove the sliding roof drive gear assembly. Keep the roof panel link-s type A and type B shims separate from other part-s shims.
    6.  
    7. Perform this same procedure for the left side.

      Click image to see an enlarged view

      Fig. Sliding roof drive gear assembly and 3 mounting bolts.-SC 430

    8.  

  8.  
  9. Remove the 3 bolts and the right sliding roof drive gear assembly. Perform this same procedure for the left side.
  10.  

To install:

  1. Install the right sliding roof drive gear assembly and install the 3 mounting bolts. Perform this same procedure for the left side. Tighten the 3 mounting bolts to 14 ft. lbs. (19 Nm).
  2.  
  3. Install the right roof panel link sub-assembly as follows:


    1. Place the roof panel link and shims back into proper position.
    2.  
    3. Install the 2 screws and nut. Tighten the 2 screws to 30 ft. lbs. (41 Nm).
    4.  
    5. Connect the wiring connector.
    6.  
    7. Perform this same procedure for the left side.
    8.  

  4.  
  5. Install right luggage compartment trim side cover as follows:


    1. Place the trim cover in proper position and engage claws labeled A and B.
    2.  
    3. Install the 4 clips.
    4.  
    5. Perform this same procedure for the left side.
    6.  

  6.  
  7. Connect the negative battery cable.
  8.  

Switch

The convertible top (sliding roof) switch is incorporated into the A/C control panel assembly. Refer to the control panel Removal & Installation procedure.

 
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