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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 >> Component Testing

Component Testing

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.

Driver Door Lock Switch

  1. Ignition OFF, disconnect the harness connector at the S13D Door Lock Switch-Driver.
  2. Test for infinite resistance between the signal terminal F and the ground terminal A with the switch in the center position.
    • If less than infinite resistance 

      Replace the S13D Door Lock Switch-Driver.

    • Go to next step: If infinite resistance 
  3. Test for infinite resistance between the signal terminal G and the ground terminal A with the switch in the center position.
    • If less than infinite resistance 

      Replace the S13D Door Lock Switch-Driver

    • Go to next step: If infinite resistance 
  4. Test for less than 2 Ω between the signal terminal G and the ground terminal A with the switch in the Lock position.
    • If 2 Ω or greater 

      Replace the S13D Door Lock Switch-Driver.

    • Go to next step: If less than 2 Ω 
  5. Test for less than 2 Ω between the signal terminal F and the ground terminal A with the switch in the Unlock position.
    • If 2 Ω or greater 

      Replace the S13D Door Lock Switch-Driver.

    • Go to next step: If less than 2 Ω 
  6. All OK

Passenger Door Lock Switch

  1. Ignition OFF, disconnect the harness connector at the S13P Door Lock Switch-Passenger.
  2. Test for infinite resistance between the signal terminal F and the ground terminal A with the switch in the center position.
    • If less than infinite resistance 

      Replace the S13P Door Lock Switch-Passenger.

    • Go to next step: If infinite resistance 
  3. Test for infinite resistance between the signal terminal G and the ground terminal A with the switch in the center position.
    • If less than infinite resistance 

      Replace the S13P Door Lock Switch-Passenger

    • Go to next step: If infinite resistance 
  4. Test for less than 2 Ω between the signal terminal G and the ground terminal A with the switch in the Lock position.
    • If 2 Ω or greater 

      Replace the S13P Door Lock Switch-Passenger.

    • Go to next step: If less than 2 Ω 
  5. Test for less than 2 Ω between the signal terminal F and the ground terminal A with the switch in the Unlock position.
    • If 2 Ω or greater 

      Replace the S13P Door Lock Switch-Passenger.

    • Go to next step: If less than 2 Ω 
  6. All OK

Cargo Door Lock Switch

  1. Ignition OFF, disconnect the harness connector at the S13A Door Lock Switch-Rear Cargo.
  2. Test for infinite resistance between the signal terminal A and the ground terminal E with the switch in the center position.
    • If less than infinite resistance 

      Replace the S13A Door Lock Switch-Rear Cargo.

    • Go to next step: If infinite resistance 
  3. Test for infinite resistance between the signal terminal D and the ground terminal E with the switch in the center position.
    • If less than infinite resistance 

      Replace the S13A Door Lock Switch-Rear Cargo

    • Go to next step: If infinite resistance 
  4. Test for less than 2 Ω between the signal terminal D and the ground terminal E with the switch in the Lock position.
    • If 2 Ω or greater 

      Replace the S13A Door Lock Switch-Rear Cargo.

    • Go to next step: If less than 2 Ω 
  5. Test for less than 2 Ω between the signal terminal A and the ground terminal E with the switch in the Unlock position.
    • If 2 Ω or greater 

      Replace the S13A Door Lock Switch-Rear Cargo.

    • Go to next step: If less than 2 Ω 
  6. All OK

Door Latch Assembly

  1. Ignition OFF, disconnect the harness connector at the appropriate A23 Door Latch Assembly.
  2. Install a 15 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the A23 Door Latch Assembly should perform the LOCK and UNLOCK function.
    • If the actuator does not perform the LOCK and UNLOCK function 

      Replace the A23 Door Latch Assembly.

    • Go to next step: If the actuator performs the LOCK and UNLOCK function 
  3. All OK

Door Lock Actuator

  1. Ignition OFF, disconnect the harness connector at the appropriate M14 Door Lock Actuator-Rear.
  2. Install a 15 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the M14 Door Lock Actuator-Rear should perform the LOCK and UNLOCK function.
    • If the actuator does not perform the LOCK and UNLOCK function 

      Replace the M14 Door Lock Actuator-Rear.

    • Go to next step: If the actuator performs the LOCK and UNLOCK function 
  3. All OK
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