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Object Detection System and Pedestrian Protection System: Diagnosis Chevrolet Spark M300

Collision/avoidance ~1253 words

Visual/Physical Inspection

  1. Inspect for aftermarket devices which may affect the operation of the system. Refer to «Checking Aftermarket Accessories»(ref-544474-S17151285262013042400000) .
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which may cause the symptom.
  3. This system can use various sensors that need to be clean in order to function properly. Make sure to check the following sensors for obstructions: Parking assist sensors located in the rear bumper cover

Symptom List

  1. «Parking Assist System Malfunction»(ref-544513-S38639960532013042400000)

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(ref-544470-S31312478522013042400000) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(ref-544470-S20767567702013042400000) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(ref-544470-S33594679972013042400000) provides an overview of each diagnostic category.

Diagnostic Aids

The park assist system is capable of performing an object detection sensor self test. When the vehicle is shifted into reverse, the system will enter the sensor self test mode and the park assist module will verify inputs from the object detection sensors. The park assist module indicates sensor status using the system alarm. If both sensor signals are being received by the rear park assist, module 1 single short tone will be activated. When one or both sensor signals are not received, the module will respond by activating the alarm with 1 tone repeated for a left sensor fault, and 2 tones repeated for a right sensor fault. If both sensors are faulted, the module will respond by activating the alarm with 3 tones continuously.

Circuit/System Testing

Rear Object Sensor Malfunction

  1. Ignition 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 ohms between the low reference circuit terminal 2 and ground. If 10 ohms or greater Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K41R Rear Parking Assist Control Module. If less than 10 ohms
  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 Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module. 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 Test for less than 2 ohms in the 8 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K41R Rear Parking Assist Control Module. If greater than 9.5 V Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module, ignition ON. 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.

Rear Parking Assist Control Module/Speaker Malfunction

  1. Ignition 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 K41R Rear Parking Assist Control Module.
  2. Test for less than 10 ohms between the ground circuit terminal 9 and ground. If 10 ohms or greater Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K41R Rear Parking Assist Control Module. If less than 10 ohms
  3. Ignition ON.
  4. Verify a test lamp illuminates between the ignition circuit terminal 1 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is OK and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K41R Rear Parking Assist Control Module. If the test lamp illuminates
  5. Ignition ON, park brake applied, transmission in REVERSE.
  6. Verify a test lamp illuminates between the control circuit terminal 4 and ground. If the test lamp does not illuminate Ignition OFF, disconnect the X7 harness connector at the K9 Body Control Module. 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 Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp illuminates
  7. Ignition OFF, disconnect the harness connector at the P28 Speaker - Parking Assist.
  8. Test for less than 10 ohms between the low reference circuit terminal 1 and ground. If 10 ohms or greater Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K41R Rear Parking Assist Control Module. If less than 10 ohms
  9. Test for 7.5-9.5 V between the 8 V reference circuit terminal 3 and ground. If less than 7.5 V Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module. 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 Test for less than 2 ohms in the 8 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K41R Rear Parking Assist Control Module. If greater than 9.5 V Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module, ignition ON. 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
  10. Ignition OFF. Place an object less than 0.4m away from the rear bumper. Connect a test lamp between reference voltage terminal 3 and control circuit terminal 2.
  11. Verify the test lamp illuminates when the vehicle is started and the transmission is shifted into reverse. If the test lamp does not illuminate Ignition OFF. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K41R Rear Parking Assist Control Module. If the test lamp illuminates
  12. Test or replace the P28 Speaker - Parking Assist.

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