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Home >> GMC >> 2019 >> Terrain SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 520 (Shift Lock Control System) >> Diagnostic Information and Procedures >> Transmission Control Lever Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 connector at the K9 Body Control Module.
  2. Ignition ON/vehicle in service mode, verify a test lamp illuminates between B+ circuit terminal 25 and ground.
    • If the test lamp does not illuminate and the circuit fuse is OK 
    1. Test circuit 2140 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • If an open/high resistance is not found, verify there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test circuit 2140 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 the test lamp illuminates 
  3. Ignition/vehicle OFF, connect the X1 connector at the K9 Body Control Module.
  4. Disconnect the connector at the S3 Transmission Shift Lever.
  5. Verify a test lamp illuminates between ground circuit terminal 2 and B+.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on circuit or ground connection.
    • Go to next step: If the test lamp illuminates 
  6. Connect a test lamp between control circuit terminal 4 and ground, ignition ON/vehicle in service mode.
  7. Verify the test lamp turns ON and OFF while pressing and releasing the brake pedal.
    • If the test lamp is always OFF 
    1. Test circuit 7553 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. Test circuit 7553 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.
    3. Replace the K9 Body Control Module.
    • If the test lamp is always ON 
    1. Test circuit 7553 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 the test lamp turns ON and OFF 
  8. Replace the S3 Transmission Shift Lever.
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