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Home >> Chevrolet >> 2015 >> Spark EV >> Repair and Diagnosis >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Object Detection System And Pedestrian Protection System >> Diagnostic Information and Procedures >> Parking Assist System Malfunction >> Circuit/System Testing >> Rear Object Sensor Malfunction
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Rear Object Sensor Malfunction

  1. Vehicle OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Disconnect the harness connector at the appropriate B78 Rear Object Sensor.
  2. Test for less than 10 Ω between the low reference circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Vehicle OFF, disconnect the harness connector 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. Vehicle 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. Vehicle 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. Vehicle OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module, vehicle 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. Replace the appropriate B78 Rear Object Sensor.
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