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Power Sunroof Inoperative

WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. 5.  Using a jumper wire to simulate operation of the sunroof to determine if the switch is at fault.
  2. 13.  Disconnecting the Position Encoding System (PES) module and shorting the limit switch LS1 circuit, the sunroof module thinks the glass is in the closed position, allowing any request from the sunroof switch to enable an output to the actuator/motor for testing.
  3. 14.  When the sunroof module is at rest the sunroof motor open and close circuits are at ground potential. This step is testing for an output to drive the motor, when the sunroof module should be idle.
    4. Fig 1: Identifying Power Sunroof Inoperative Diagnostic Table (Steps 1-4)
    G01755961Courtesy of GENERAL MOTORS CORP.
    Fig 2: Identifying Power Sunroof Inoperative Diagnostic Table (Steps 5-12)
    G01755962Courtesy of GENERAL MOTORS CORP.
    Fig 3: Identifying Power Sunroof Inoperative Diagnostic Table (Steps 13-21)
    G01755963Courtesy of GENERAL MOTORS CORP.
    Fig 4: Identifying Power Sunroof Inoperative Diagnostic Table (Steps 22-33)
    G01755964Courtesy of GENERAL MOTORS CORP.
    Fig 5: Identifying Power Sunroof Inoperative Diagnostic Table (Steps 34-45)
    G01755965Courtesy of GENERAL MOTORS CORP.
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