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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 333 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> DTC B3938: Fuel Fill Door Actuator Lock Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the X53A Fuse Block-Rear Body. 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 34 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.
    • If less than 10 Ω 
  3. Ignition ON
  4. Connect a test lamp between the control circuit terminal 36 and the ground circuit terminal 34.
  5. Verify the test lamp turns ON and OFF when commanding the All Doors Lock/Unlock to Lock and Unlock with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control 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.
    • If the test lamp is always ON 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, Ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 Body Control Module.
    • If the test lamp turns ON and OFF 
  6. Ignition OFF, connect the X1 harness connector at the X53A Fuse Block-Rear Body. Disconnect the harness connector at the M97 Fuel Fill Door Lock Actuator, ignition ON.
  7. Connect a test lamp between the control circuit terminal 1 and control circuit terminal 2, ignition ON.
  8. Verify the test lamp turns ON and OFF when commanding the All Doors Lock/Unlock to Lock and Unlock with a scan tool.
    • If the test lamp remains OFF during either of the commands 
    1. Ignition OFF, remove the test lamp. Disconnect the X1 harness connector at the X53A Fuse Block - Rear Body
    2. Test for infinite resistance between each control circuit and ground.
      • If infinite resistance
    3. Test for less than 2 Ω between the M97 Fuel Fill Door Lock Actuator the control circuit 2 and the X53A Fuse Block - Rear Body control circuit 43 X1
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the X53A Fuse Block - Rear Body
    • If the test lamp turns ON during each of the commands 
  9. Test or replace the M97 Fuel Fill Door Lock Actuator.
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