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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brake System >> Diagnostic Information and Procedures >> Brake Booster Pump Motor Malfunction >> Circuit/System Testing

Circuit/System Testing

NOTE:

Circuit/System Verification must be performed before Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the KR14 Brake Booster Pump Motor Relay. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10Ω between the ground circuit terminal 1 and ground.
    • If 10Ω or greater 
    1. Test for less than 2Ω in the ground circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, repair the open/high resistance in the ground connection.
    • If less than 10Ω 
  3. Ignition ON.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2Ω in the B+ circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the M9 Brake Booster Pump Motor.
    • If the test lamp illuminates 
  5. Connect a test lamp between the control circuit terminal 2 and ground.
  6. Verify the test lamp turns ON and OFF when commanding the Brake Booster Electric Vacuum Pump On and Off with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the harness connector at the K17 Electronic Brake Control Module.
    2. Test for infinite resistance between the control 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 control 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 the test lamp is always ON 
    1. Ignition OFF, disconnect the harness connector at the K17 Electronic Brake Control Module, ignition ON.
    2. Test for less than 1V between the control 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 the test lamp turns ON and OFF 
  7. Ignition OFF, connect the X1 harness connector at the KR14 Brake Booster Pump Motor Relay. Disconnect the X2 harness connector at the KR14 Brake Booster Pump Motor Relay.
  8. Connect a test lamp between the ground circuit terminal 2 and the B+ circuit terminal 1 at the KR14 Brake Booster Pump Motor Relay, ignition ON.
  9. Verify the test lamp turns ON and OFF when commanding the Brake Booster Electric Vacuum Pump On and Off with a scan tool.
    • If the test lamp does not turn ON and OFF 

      Replace the KR14 Brake Booster Pump Motor Relay.

    • If the test lamp turns ON and OFF 
  10. Install a 30A fused jumper wire between the M9 Brake Booster Pump Motor terminal 1 and B+. Install a jumper wire between the M9 Brake Booster Pump Motor terminal 2 and ground.
  11. Verify the M9 Brake Booster Pump Motor activates.
    • If the brake booster pump motor does not activate 

      Replace the M9 Brake Booster Pump Motor.

    • If the brake booster pump motor activates 
  12. All OK.
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