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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brake System >> Diagnostic Information and Procedures >> DTC C025E: Brake Booster Vacuum Sensor >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B19B Brake Booster Vacuum Sensor. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10Ω between the low reference circuit terminal 2 and ground.
    • If 10Ω or greater 
    1. Disconnect the harness connector at the K17 Electronic Brake Control Module.
    2. Test for less than 2Ω in the low reference circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K17 Electronic Brake Control Module.
    • If less than 10Ω 
  3. Ignition ON.
  4. Test for 4.8-5.2V between the 5V reference circuit terminal 3 and ground.
    • If less than 4.8V 
    1. Ignition OFF, disconnect the harness connector at the K17 Electronic Brake Control Module.
    2. Test for infinite resistance between the 5V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2Ω in the 5V reference circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K17 Electronic Brake Control Module.
    • If greater than 5.2V 
    1. Ignition OFF, disconnect the harness connector at the K17 Electronic Brake Control Module, ignition ON.
    2. Test for less than 1V between the 5V reference circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the K17 Electronic Brake Control Module.
    • If between 4.8-5.2V 
  5. Ignition OFF, disconnect the harness connector at the K17 Electronic Brake Control Module, Ignition ON.
  6. Test for less than 1V between the B19B Brake Booster Vacuum Sensor signal circuit terminal 1 and ground.
    • If greater than 1V 

      Repair the short to voltage on the circuit.

    • If less than 1V 
  7. Ignition OFF.
  8. Test for infinite resistance between the B19B Brake Booster Vacuum Sensor signal circuit terminal 1 and ground.
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  9. Test for less than 2Ω between the B19B Brake Booster Vacuum Sensor signal circuit terminal 1 and the K17 Electronic Brake Control Module signal circuit terminal 34.
    • If 2Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 2Ω 
  10. Test or replace the B19B Brake Booster Vacuum Sensor.
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