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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Vehicle Access System) >> Diagnostic Information and Procedures >> Power Door Locks Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify the scan tool Driver Door Lock Switch parameter and the Driver Door Unlock Switch parameter changes from Inactive to Active when pushing the appropriate switch on the S13D Door Lock Switch-Driver.
    • If a parameter does not change 

      Refer to Circuit/System Testing - Driver Door Lock Switch Malfunction.

    • Go to next step: If the parameter changes 
  3. Verify the scan tool Passenger Door Lock Switch parameter and the Passenger Door Unlock Switch parameter changes from Inactive to Active when pushing the appropriate switch on the S13P Door Lock Switch-Passenger.
    • If the value is always Inactive 

      Refer to Circuit/System Testing - Passenger Door Lock Switch Inoperative.

    • If a parameter is always Active 

      Refer to Circuit/System Testing - Passenger/Cargo Door Lock Switch Malfunction.

    • Go to next step: If the parameter changes 
  4. Verify the scan tool Passenger Door Lock Switch parameter and the Passenger Door Unlock Switch parameter changes from Inactive to Active when pushing the appropriate switch on the S13A Door Lock Switch-Rear Cargo.
    • If the value is always Inactive 

      Refer to Circuit/System Testing - Rear Cargo Door Lock Switch Inoperative.

    • If a parameter is always Active 

      Refer to Circuit/System Testing - Passenger/Cargo Door Lock Switch Malfunction.

    • Go to next step: If the parameter changes 
  5. Verify all vehicle doors Lock and Unlock when pushing the appropriate switch on the S13D Door Lock Switch-Driver.
    • If a driver, passenger or rear cargo door LOCK or UNLOCK functions do not work 

      Refer to Circuit/System Testing - Driver/Passenger/Cargo Door Lock Malfunction.

    • If the M14RR Door Lock Actuator-Right Rear LOCK or UNLOCK function does not work 

      Refer to Circuit/System Testing - Right Rear Door Lock Malfunction.

    • If all door LOCK or UNLOCK function do not work 

      Refer to Circuit/System Testing - Door Lock And Unlock Inoperative.

    • Go to next step: If the LOCK and UNLOCK function for all doors works 
  6. All OK
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