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Home >> Chevrolet >> 2019 >> Tahoe SSV, Gas/Ethanol >> Repair and Diagnosis >> Steering >> Steering Column >> Steering Wheel And Column >> Diagnostic Information and Procedures >> DTC C0549 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the K60 Steering Column Lock Module.
  2. Test for less than 1 V between the control circuit terminal 2 and ground.
    • If 1 V or greater 
    1. Disconnect the harness connector at the K9 Body Control Module. Ignition ON.
    2. Test for less than 1 V between the control circuit terminal 2 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.
    • Go to next step: If less than 1 V 
  3. Ignition ON.
  4. Test for B+ between the control circuit terminal 2 and ground.
    • If less than B+ 
    1. Disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit terminal 2 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the signal circuit terminal 2 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω
    4. Replace the K9 Body Control Module.
    • Go to next step: If B+ 
  5. Replace the K60 Steering Column Lock Module.