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Home >> GMC >> 2021 >> Yukon AT4 >> Repair and Diagnosis >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Driver Assistance Systems >> Diagnostic Information and Procedures >> DTC B13AD >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the connector at the S86 Vehicle Stability Control System Switch.
  2. Verify a test lamp illuminates between ground circuit terminal 10 and B+
    • If the test lamp does not illuminate 

      Repair the open/high resistance on circuit 1851 or the ground connection.

    • Go to next step: If the test lamp illuminates 
  3. Ignition ON.
  4. Verify the scan tool Lane Departure Warning Switch Status parameter is Off.
    • If the parameter is not Off 
    1. Test circuit 3153 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 parameter is Off 
  5. Connect a 3 A fused jumper wire between signal circuit terminal 4 and ground.
  6. Verify the scan tool Lane Departure Warning Switch Status parameter is On.
    • If the parameter is not On 
    1. Test circuit 3153 for an open/high resistance.
      • If an open/high resistance 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 parameter is On 
  7. Replace the S86 Vehicle Stability Control System Switch.
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