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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 >> DTC B3140, B3145, B3150, or B3155 >> 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 changes from Inactive to Active when pressing the appropriate switch on the S13D Door Lock Switch-Driver
    • If the parameter does not change 

      Refer to Circuit/System Testing - Test 1

    • Go to next step: If the parameter changes 
  3. Verify the scan tool Driver Door Unlock Switch parameter changes from Inactive to Active when pressing the appropriate switch on the S13D Door Lock Switch-Driver
    • If the parameter does not change 

      Refer to Circuit/System Testing - Test 1

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

      Refer to Circuit/System Testing - Test 2

    • If the parameter is always Active 

      Refer to Circuit/System Testing - Test 4

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

      Refer to Circuit/System Testing - Test 2

    • If the parameter is always Active 

      Refer to Circuit/System Testing - Test 4

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

      Refer to Circuit/System Testing - Test 3

    • If the parameter is always Active 

      Refer to Circuit/System Testing - Test 4

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

      Refer to Circuit/System Testing - Test 3

    • If the parameter is always Active 

      Refer to Circuit/System Testing - Test 4

    • Go to next step: If the parameter changes 
  8. All OK.
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