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Component Testing

WARNING: This page is about a different car, the 2020 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

M74LR Rear Side Door Window Regulator Motor - Left/M74RR Rear Side Door Window Regulator Motor - Right

  1. Ignition/Vehicle - Off
  2. Disconnect the appropriate electrical connector:M74LR Rear Side Door Window Regulator Motor - LeftorM74RR Rear Side Door Window Regulator Motor - Right
  3. Connect a 25 A fused jumper wire between the test points: Control terminal 1 & B+
    4. CAUTION:

    Complete the testing as quickly as possible in order to prevent overheating and damaging the component.

  5. Momentarily connect a jumper wire between the test points: Control terminal 2 & Ground

    Reverse the jumper wires 2 times between the terminals.

    Verify the component works as specified: M74 Window Motor = Up & Down

    • If not the specified state 

      Replace the component:M74LR Rear Side Door Window Regulator Motor - LeftorM74RR Rear Side Door Window Regulator Motor - Right

    • Go to next step: If the specified state 
  6. All OK.
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