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Circuit/System Verification

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify the M74D Window Motor-Driver functions while commanding the Driver Window Motor Up and Down with a scan tool.
    • If the M74D Window Motor-Driver does not move UP and DOWN as commanded 

      Refer to Circuit/System Testing - Driver Window Motor Malfunction.

    • If the M74D Window Motor-Driver moves UP and DOWN as commanded 
  3. Verify the M74D Window Motor-Driver moves while commanding the window UP and DOWN with the S79D Window Switch-Driver.
    • If the M74D Window Motor-Driver does not move UP and DOWN as commanded 

      Refer to Circuit/System Testing - Driver Window Switch Malfunction.

    • If the M74D Window Motor-Driver moves UP and DOWN as commanded 
  4. Verify the M74D Window Motor-Driver performs the express UP and express DOWN functions with the S79D Window Switch-Driver.
    1. Verify the M74D Window Motor-Driver performs the express UP and express DOWN functions with the S79D Window Switch-Driver
    • If the M74D Window Motor-Driver does not express UP or express DOWN 

      Refer to Circuit/System Testing - Driver Window Switch Malfunction.

    • If the M74D Window Motor-Driver performs the express UP and express DOWN functions 
  5. Verify the M74P Window Motor-Passenger performs the UP and DOWN functions at both the S79D Window Switch-Driver and S79P Window Switch-Passenger.
    • If the M74P Window Motor-Passenger is inoperative from both the S79D Window Switch-Driver and S79P Window Switch-Passenger 

      Refer to Circuit/System Testing - Passenger Window Inoperative From Both Switches.

    • If the M74P Window Motor-Passenger is inoperative from the S79P Window Switch-Passenger only 

      Refer to Circuit/System Testing - Passenger Window Inoperative From A Single Switch.

    • If the M74P Window Motor-Passenger is inoperative from the S79D Window Switch-Driver only 

      Refer to Circuit/System Testing - Passenger Window Inoperative From A Single Switch.

    • If the M74P Window Motor-Passenger performs the UP and DOWN functions at both S79D Window Switch-Driver and S79P Window Switch-Passenger 
  6. Verify the M74LR Window Motor-Left Rear and M74RR Window Motor-Right Rear performs the UP and DOWN functions at both the S79D Window Switch-Driver and each of the S79 Window Switch-Rear.
    • If a M74 Window Motor-Rear is inoperative from both the driver and rear window switch 

      Refer to Circuit/System Testing - Rear Window Inoperative From Both Switches

    • If a M74 Window Motor-Rear is inoperative from the S79 Window Switch-Rear only 

      Refer to Circuit/System Testing - Rear Window Switch Inoperative

    • If a M74 Window Motor-Rear is inoperative from the S79D Window Switch-Driver only 

      Test or replace the S79D Window Switch-Driver.

    • If both M74 Window Motor-Rear performs the UP and DOWN functions at the S79D Window Switch-Driver and the S79 Window Switch-Rear 
  7. Lock out the rear window switches by pressing the lockout switch on the S79D Window Switch-Driver.
  8. Verify the M74LR Window Motor-Left Rear and M74RR Window Motor-Right Rear is inoperative at both of the S79 Window Switch-Rear .
    • If both M74 Window Motor-Rear continue to function from the S79 Window Switch-Rear 

      Refer to Circuit/System Testing - Rear Window Lockout Inoperative

    • If both M74 Window Motor-Rear are inoperative from the S79 Window Switch-Rear 
  9. All OK.
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