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Home >> Buick >> 2016 >> Verano Base, Gas/Ethanol >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Object Detection System - Park Assist System) >> Diagnostic Information and Procedures >> DTC B0958, B0959, B0960, or B0961: Parking Assist Rear Sensor >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2015 Buick Verano. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, scan tool disconnected, disconnect the harness 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 10 Ω between the low reference circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector X2 at the K41R Rear Parking Assist 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 K41R Rear Parking Assist Control Module.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Test for 7.5-9.5 V between the 8 V reference circuit terminal 1 and ground.
    • If less than 7.5 V 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module.
    2. Test for infinite resistance between the 8 V 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 2 Ω in the 8 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 K41R Rear Parking Assist Control Module.
    • If greater than 9.5 V 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module, ignition ON.
    2. Test for less than 1 V between the 8 V reference circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K41R Rear Parking Assist Control Module.
    • If between 7.5-9.5 V 
  5. Test for 7.5-9.5 V between the signal circuit terminal 3 and ground.
    • If less than 7.5 V 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module.
    2. 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
    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 K41R Rear Parking Assist Control Module.
    • If greater than 9.5 V 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist 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 K41R Rear Parking Assist Control Module.
    • If between 7.5-9.5 V 
  6. Test or replace the B78 Rear Object Sensor.
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