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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.

M40 Rear Compartment Lid Latch - Test

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector:M40 Rear Compartment Lid Latch
  3. Connect a jumper wire between the test points:Ground terminal 2 & Ground
  4. Momentarily connect a 10 A fused jumper wire between the test points:Control terminal 1 & 12 V

    Verify the component turns On and Off when connecting and disconnecting the jumper wire:M40 Rear Compartment Lid Latch

    • If the component does not turn On and Off 

      Replace the component:M40 Rear Compartment Lid Latch

    • Go to next step: If the component turns On and Off 
  5. All OK.

E7 Rear License Plate Lamp - Test

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector:E7 Rear License Plate Lamp
  3. Test for infinite resistance between the test points:Signal terminal 3 & Ground terminal 1 - S58A Rear Compartment Lid Unlatch Switch - Exterior - Not Pressed
    • If less than infinite resistance 

      Replace the component:E7 Rear License Plate Lamp

    • Go to next step: If infinite resistance 
  4. Test for less than 3 ohms between the test points:Signal terminal 3 & Ground terminal 1 - S58A Rear Compartment Lid Unlatch Switch - Exterior - Pressed
    • If 3 ohms or greater 

      Replace the component:E7 Rear License Plate Lamp

    • Go to next step: If less than 3 ohms 
  5. All OK.

S58B Rear Compartment Lid Release Switch - Interior - Test

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector:S58B Rear Compartment Lid Release Switch - Interior
  3. Test for infinite resistance between the test points:Signal terminal 3 & Ground terminal 2 - Not Pressed
    • If less than infinite resistance 

      Replace the component:S58B Rear Compartment Lid Release Switch - Interior

    • Go to next step: If infinite resistance 
  4. Test for less than 3 ohms between the test points:Signal terminal 3 & Ground terminal 2 - Pressed
    • If 3 ohms or greater 

      Replace the component:S58B Rear Compartment Lid Release Switch - Interior

    • Go to next step: If less than 3 ohms 
  5. All OK.
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