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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 Testing

Circuit/System 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.

Test 1

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S13D Door Lock Switch-Driver. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal A and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Verify the scan tool Driver Door Lock Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit terminal G and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • Go to next step: If Inactive 
  5. Verify the scan tool Driver Door Unlock Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit terminal F and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • Go to next step: If Inactive 
  6. Install a 3 A fused jumper wire between the signal circuit terminal G and the ground circuit terminal A.
  7. Verify the scan tool Driver Door Lock Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal G and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • Go to next step: If Active 
  8. Install a 3 A fused jumper wire between the signal circuit terminal F and the ground circuit terminal A.
  9. Verify the scan tool Driver Door Unlock Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal F and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • Go to next step: If Active 
  10. Test or replace the S13D Door Lock Switch-Driver.

Test 2

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S13P Door Lock Switch-Passenger. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal A and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Install a 3 A fused jumper wire between the signal circuit terminal G and the ground circuit terminal A.
  4. Verify the scan tool Passenger Door Lock Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, disconnect the X6 harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal G and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • Go to next step: If Active 
  5. Install a 3 A fused jumper wire between the signal circuit terminal F and the ground circuit terminal A.
  6. Verify the scan tool Passenger Door Unlock Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, disconnect the X6 harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal F and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • Go to next step: If Active 
  7. Test or replace the S13P Door Lock Switch-Passenger.

Test 3

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S13A Door Lock Switch-Rear Cargo. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal E and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Install a 3 A fused jumper wire between the signal circuit terminal D and the ground circuit terminal E.
  4. Verify the scan tool Passenger Door Lock Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, disconnect the X6 harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal D and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • Go to next step: If Active 
  5. Install a 3 A fused jumper wire between the signal circuit terminal A and the ground circuit terminal E
  6. Verify the scan tool Passenger Door Unlock Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, disconnect the X6 harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal A and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • Go to next step: If Active 
  7. Test or replace the S13A Door Lock Switch-Rear Cargo.

Test 4

  1. Ignition OFF, disconnect the harness connector at the S13P Door Lock Switch-Passenger.
  2. Disconnect the harness connector at the S13A Door Lock Switch-Rear Cargo, ignition ON
  3. Verify the scan tool Passenger Door Lock Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the X6 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the K9 Body Control Module signal circuit terminal 18 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance, replace the K9 Body Control Module
    • Go to next step: If Inactive 
  4. Verify the scan tool Passenger Door Unlock Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the X6 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the K9 Body Control Module signal circuit terminal 9 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance, replace the K9 Body Control Module
    • Go to next step: If Inactive 
  5. Connect the harness connector at the S13P Door Lock Switch-Passenger.
  6. 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 Active 

      Test or replace the S13P Door Lock Switch-Passenger.

    • 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 S13P Door Lock Switch-Passenger.
    • If Active 

      Test or replace the S13P Door Lock Switch-Passenger.

    • Go to next step: If the parameter changes 
  8. Connect the harness connector at the S13A Door Lock Switch-Rear Cargo.
  9. 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 Active 

      Test or replace the S13A Door Lock Switch-Rear Cargo.

    • Go to next step: If the parameter changes 
  10. 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 Active 

      Test or replace the S13A Door Lock Switch-Rear Cargo.

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