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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Diagnostic Information and Procedures >> DTC P0572 or P0573: Brake Switch Circuit 1 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module, ignition ON.
  2. Connect a test lamp between the signal circuit terminal 57 and ground.
  3. Verify the test lamp turns ON and OFF when pressing and releasing the brake pedal.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit and ground.
      • If not infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance.
    3. Test for less than 2 Ω in the signal 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, disconnect the harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the signal 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 
  4. Replace the K20 Engine Control Module.
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