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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 140 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC P0572 or P0573 >> 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/Vehicle Off and all vehicle systems Off, disconnect the harness connector at the B22 Brake Pedal Position Sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit at the B22 Brake Pedal Position Sensor component connector and ground.
    • If 10 Ω or greater 
    1. Ignition/Vehicle Off, disconnect the harness connector at the K9 Body Control Module.
    2. Test for less than 2 Ω in the low reference 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.
    • Go to next step: If less than 10 Ω 
  3. Ignition On/Vehicle in Service Mode.
  4. Test for 4.8 - 5.2 V between the 5 V reference circuit at the B22 Brake Pedal Position Sensor component connector and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the 5 V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
    3. Test for less than 2 Ω in the 5 V reference 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 greater than 5.2 V 
    • Repair the short to voltage on the circuit.
    • Go to next step: If between 4.8 and 5.2 V 
  5. Ignition/Vehicle Off, disconnect the harness connector at the K9 Body Control Module, Ignition On/Vehicle in Service Mode.
    1. 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.
      • Go to next step: If less than 1 V
    2. Test for infinite resistance between the signal circuit at the B22 Brake Pedal Position Sensor component connector 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 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.
  6. Test or replace the B22 Brake Pedal Position Sensor.
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