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Home >> Chevrolet >> 2021 >> Traverse L >> Repair and Diagnosis >> External Pages >> Different car >> Section 68 (Driver Assistance Systems) >> Diagnostic Information and Procedures >> DTC B1386 or B1387 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2020 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

Without A45

  1. Ignition OFF, disconnect the X8 connector at the K9 Body Control Module.
  2. Verify the P45LR Front Seat Lane Departure Warning Actuator - Left Rear and P45RR Front Seat Lane Departure Warning Actuator - Right Rear are inactive and not vibrating.
    • If the P45LR Front Seat Lane Departure Warning Actuator - Left Rear is active and vibrating 

      Repair the short to voltage on circuit 3037.

    • If the P45RR Front Seat Lane Departure Warning Actuator - Right Rear is active and vibrating 

      Repair the short to voltage on circuit 3038.

    • Go to next step: If both P45 Front Seat Lane Departure Warning Actuators are inactive and not vibrating 
  3. Connect a 3 A fused jumper wire between control circuit terminal 13 and B+.
  4. Verify the P45LR Front Seat Lane Departure Warning Actuator - Left Rear is active and vibrating.
    • If the P45LR Front Seat Lane Departure Warning Actuator - Left Rear is inactive and not vibrating 
    1. Test circuit 2150 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit or ground connection.
      • Go to next step: If an open/high resistance is not found
    2. Test circuit 3037 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
    3. Test circuit 3037 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
    4. Replace the P45LR Front Seat Lane Departure Warning Actuator - Left Rear
    • Go to next step: If the P45LR Front Seat Lane Departure Warning Actuator - Left Rear is active and vibrating 
  5. Remove the jumper wire.
  6. Connect a 3 A fused jumper wire between control circuit terminal 14 and B+.
  7. Verify the P45RR Front Seat Lane Departure Warning Actuator - Right Rear is active and vibrating.
    • If the P45RR Front Seat Lane Departure Warning Actuator - Right Rear is inactive and not vibrating 
    1. Test circuit 2150 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit or ground connection.
      • Go to next step: If an open/high resistance is not found
    2. Test circuit 3038 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
    3. Test circuit 3038 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
    4. Replace the P45RR Front Seat Lane Departure Warning Actuator - Right Rear.
    • Go to next step: If the P45RR Front Seat Lane Departure Warning Actuator - Right Rear is active and vibrating 
  8. Replace the K9 Body Control Module.

With A45

  1. Ignition OFF, disconnect the X3 connector at the K40D Driver Seat Adjuster Memory Module.
  2. Verify the P45LR Front Seat Lane Departure Warning Actuator - Left Rear and P45RR Front Seat Lane Departure Warning Actuator - Right Rear are inactive and not vibrating.
    • If the P45LR Front Seat Lane Departure Warning Actuator - Left Rear is active and vibrating 

      Repair the short to voltage on circuit 3037.

    • If the P45RR Front Seat Lane Departure Warning Actuator - Right Rear is active and vibrating 

      Repair the short to voltage on circuit 3038.

    • Go to next step: If both P45 Front Seat Lane Departure Warning Actuators are inactive and not vibrating 
  3. Connect a 3 A fused jumper wire between control circuit terminal 6 and B+.
  4. Verify the P45LR Front Seat Lane Departure Warning Actuator - Left Rear is active and vibrating.
    • If the P45LR Front Seat Lane Departure Warning Actuator - Left Rear is inactive and not vibrating 
    1. Test circuit 2150 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit or ground connection.
      • Go to next step: If an open/high resistance is not found
    2. Test circuit 3037 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
    3. Test circuit 3037 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
    4. Replace the P45LR Front Seat Lane Departure Warning Actuator - Left Rear
    • Go to next step: If the P45LR Front Seat Lane Departure Warning Actuator - Left Rear is active and vibrating 
  5. Remove the jumper wire.
  6. Connect a 3 A fused jumper wire between control circuit terminal 5 and B+.
  7. Verify the P45RR Front Seat Lane Departure Warning Actuator - Right Rear is active and vibrating.
    • If the P45RR Front Seat Lane Departure Warning Actuator - Right Rear is inactive and not vibrating 
    1. Test circuit 2150 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit or ground connection.
      • Go to next step: If an open/high resistance is not found
    2. Test circuit 3038 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
    3. Test circuit 3038 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
    4. Replace the P45RR Front Seat Lane Departure Warning Actuator - Right Rear.
    • Go to next step: If the P45RR Front Seat Lane Departure Warning Actuator - Right Rear is active and vibrating 
  8. Replace the K40D Driver Seat Adjuster Memory Module.
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