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Home >> Buick >> 2021 >> Envision Preferred, AWD >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Vehicle Access System >> Diagnostic Information and Procedures >> Exterior Door Handle Switch Malfunction >> Circuit/System Testing

Circuit/System Testing

Test 1

  1. Ignition/vehicle OFF, disconnect the connector at the B27LF Front Side Door Outside Handle Switch - Left.
  2. Verify a test lamp illuminates between ground circuit terminal 5 and B+.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on circuit 2151 or the ground connection.
    • Go to next step: If the test lamp illuminates 
  3. Ignition - On/Vehicle - In Service Mode
  4. Verify the scan tool Left Front Door Exterior Lock/Unlock Switch Status parameter is Inactive
    • If not Inactive 
    1. Test the circuit 2675 for a short to ground
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the K9 Body Control Module.
    • Go to next step: If Inactive 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and ground.
  6. Verify the scan tool parameter is now Active.
    • If not Active and the 3 A fuse is OK 
    1. Test the circuit 2675 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    2. Replace the K9 Body Control Module.
    • If not Active and the 3 A fuse is open 
    1. Test the circuit 2675 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Replace the K9 Body Control Module.
    • Go to next step: If Active 
  7. Replace the B27LF Front Side Door Outside Handle Switch - Left

Test 2

  1. Ignition/vehicle OFF, disconnect the connector at the B27RF Front Side Door Outside Handle Switch - Right.
  2. Verify a test lamp illuminates between ground circuit terminal 5 and B+.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on circuit 2051 or the ground connection.
    • Go to next step: If the test lamp illuminates 
  3. Ignition - On/Vehicle - In Service Mode
  4. Verify the scan tool Right Front Door Exterior Lock/Unlock Switch Status parameter is Inactive
    • If not Inactive 
    1. Test the circuit 2676 for a short to ground
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the K9 Body Control Module.
    • Go to next step: If Inactive 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and ground.
  6. Verify the scan tool parameter is now Active.
    • If not Active and the 3 A fuse is OK 
    1. Test the circuit 2676 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    2. Replace the K9 Body Control Module.
    • If not Active and the 3 A fuse is open 
    1. Test the circuit 2676 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Replace the K9 Body Control Module.
    • Go to next step: If Active 
  7. Replace the B27RF Front Side Door Outside Handle Switch - Right

Test 3

  1. Ignition/vehicle OFF, disconnect the connector at the B27LR Rear Side Door Outside Handle Switch - Left.
  2. Verify a test lamp illuminates between ground circuit terminal 5 and B+.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on circuit 2151 or the ground connection.
    • Go to next step: If the test lamp illuminates 
  3. Ignition - On/Vehicle - In Service Mode
  4. Verify the scan tool Left Rear Door Exterior Lock/Unlock Switch Status parameter is Inactive
    • If not Inactive 
    1. Test the circuit 4994 for a short to ground
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the K9 Body Control Module.
    • Go to next step: If Inactive 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and ground.
  6. Verify the scan tool parameter is now Active.
    • If not Active and the 3 A fuse is OK 
    1. Test the circuit 4994 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    2. Replace the K9 Body Control Module.
    • If not Active and the 3 A fuse is open 
    1. Test the circuit 4994 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Replace the K9 Body Control Module.
    • Go to next step: If Active 
  7. Replace the B27LR Rear Side Door Outside Handle Switch - Left

Test 4

  1. Ignition/vehicle OFF, disconnect the connector at the A23RR Rear Side Door Outside Handle Switch - Right.
  2. Verify a test lamp illuminates between ground circuit terminal 5 and B+.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on circuit 2051 or the ground connection.
    • Go to next step: If the test lamp illuminates 
  3. Ignition - On/Vehicle - In Service Mode
  4. Verify the scan tool Right Rear Door Exterior Lock/Unlock Switch Status parameter is Inactive
    • If not Inactive 
    1. Test the circuit 4995 for a short to ground
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the K9 Body Control Module.
    • Go to next step: If Inactive 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and ground.
  6. Verify the scan tool parameter is now Active.
    • If not Active and the 3 A fuse is OK 
    1. Test the circuit 4995 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    2. Replace the K9 Body Control Module.
    • If not Active and the 3 A fuse is open 
    1. Test the circuit 4995 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Replace the K9 Body Control Module.
    • Go to next step: If Active 
  7. Replace the A23RR Rear Side Door Outside Handle Switch - Right
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