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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 143 (Fixed And MOVEABLE Windows) >> Diagnostic Information and Procedures >> DTC B1956-B1959 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON
  2. Verify the M74 Front Side Door Window Regulator Motor listed below performs the UP and DOWN functions while pressing and pulling the each window switch on the S79D Front Side Door Window Control Switch - Driver
    • M74D Front Side Door Window Regulator Motor - Driver
    • M74P Front Side Door Window Regulator Motor - Passenger
    • If the Up and Down functions do not work 

      Replace the appropriate M74 Front Side Door Window Regulator Motor

    • Go to next step: If the UP and DOWN functions works 
  3. Command the appropriate M74 Front Side Door Window Regulator Motor DOWN by pressing the window switch on the S79D Front Side Door Window Control Switch - Driver
  4. Verify the M74 Front Side Door Window Regulator Motor listed below performs the Express Up functions pulling and releasing the window switch on the S79D Front Side Door Window Control Switch - Driver
    • M74D Front Side Door Window Regulator Motor - Driver
    • M74P Front Side Door Window Regulator Motor - Passenger
    • Go to next step: If the M74 Front Side Door Window Regulator Motor performs the Express Up functions 
  5. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
  6. Ignition ON
  7. Command the appropriate M74 Front Side Door Window Regulator Motor DOWN by pressing the window switch on the S79D Front Side Door Window Control Switch - Driver
  8. Verify the M74 Front Side Door Window Regulator Motor listed below performs the Express Up functions pulling and releasing the window switch on the S79D Front Side Door Window Control Switch - Driver
    • M74D Front Side Door Window Regulator Motor - Driver
    • M74P Front Side Door Window Regulator Motor - Passenger
    • If a M74 Front Side Door Window Regulator Motor does not perform the Express Up function 

      Replace the M74 Front Side Door Window Regulator Motor

    • Go to next step: If the M74 Front Side Door Window Regulator Motor performs the Express Up function 
  9. All OK.
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