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Home >> Buick >> 2015 >> Regal GS, FWD, Standard Trans >> Repair and Diagnosis >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Object Detection And Pedestrian Protection System >> Diagnostic Information and Procedures >> DTC B0958, B0959, B0960, or B0961: Parking Assist Rear Sensor >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate B78 Rear Object Sensor. It may take up to 2 minutes 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. Ignition OFF, disconnect the harness connector X2 at the K41R Rear Parking Assist 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 K41R Rear Parking Assist Control Module.
    • If less than 10Ω 
  3. Ignition ON.
  4. Test for 7.5-9.5V between the 8V reference circuit terminal 1 and ground.
    • If less than 7.5V 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module.
    2. Test for infinite resistance between the 8V 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 8V reference circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K41R Rear Parking Assist Control Module.
    • If greater than 9.5V 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module, ignition ON.
    2. Test for less than 1V between the 8V reference circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the K41R Rear Parking Assist Control Module.
    • If between 7.5-9.5V 
  5. Ignition OFF, remove the appropriate B78 Rear Object Sensor and switch locations with another properly operating sensor. Connect harness connector at both sensors. Ignition ON.
  6. Verify the DTC is set for the new location in which the malfunctioning sensor is installed.
    • If DTC set for the new location 

      Replace the malfunctioning B78 Rear Object Sensor.

    • If DTC set for the original location 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module, ignition ON.
    2. Test for less than 1V between the signal circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V
    3. Ignition OFF.
    4. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    5. Test for less than 2Ω in the circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K41R Rear Parking Assist Control Module.
    • If no DTC set 
  7. All OK.
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