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Object Detection System - Park Assist System Buick Regal V

Collision/avoidance 4 illustrations ~4268 words

Scheme 1

Scheme 1: UD7 Wiring Schematics
Scheme 1: UD7 Wiring Schematics

Diagnostic Code Index

DTCDescription
DTC B0958, B0959, B0960, or B0961DTC B0958 01 Parking Aid Rear Sensor Left Corner Circuit Short to Battery DTC B0958 06 Parking Aid Rear Sensor Left Corner Circuit Low Voltage/Open DTC B0958 08 Parking Aid Rear Sensor Left Corner Circuit Performance - Signal Invalid DTC B0958 21 Parking Aid Rear Sensor Left Corner Circuit Incorrect Period DTC B0958 3A Parking Aid Rear Sensor Left Corner Circuit Incorrect Component Installed DTC B0959 01 Parking Aid Rear Sensor Left Middle Circuit Short to Battery DTC B0959 06 Parking Aid Rear Sensor Left Middle Circuit Low Voltage/Open DTC B0959 08 Parking Aid Rear Sensor Left Middle Circuit Performance - Signal Invalid DTC B0959 21 Parking Aid Rear Sensor Left Middle Circuit Incorrect Period DTC B0959 3A Parking Aid Rear Sensor Left Middle Circuit Incorrect Component Installed DTC B0960 01 Parking Aid Rear Sensor Right Middle Circuit Short to Battery DTC B0960 06 Parking Aid Rear Sensor Right Middle Circuit Low Voltage/Open DTC B0960 08 Parking Aid Rear Sensor Right Middle Circuit Performance - Signal Invalid DTC B0960 21 Parking Aid Rear Sensor Right Middle Circuit Incorrect Period DTC B0960 3A Parking Aid Rear Sensor Right Middle Circuit Incorrect Component Installed DTC B0961 01 Parking Aid Rear Sensor Right Corner Circuit Short to Battery DTC B0961 06 Parking Aid Rear Sensor Right Corner Circuit Low Voltage/Open DTC B0961 08 Parking Aid Rear Sensor Right Corner Circuit Performance - Signal Invalid DTC B0961 21 Parking Aid Rear Sensor Right Corner Circuit Incorrect Period DTC B0961 3A Parking Aid Rear Sensor Right Corner Circuit Incorrect Component Installed
DTC B0967 or B0968DTC B0967 02 Parking Aid On/Off Switch Circuit Short to Ground DTC B0968 01 Parking Aid On/Off Switch Indicator Circuit Short to Battery
DTC B1015DTC B1015 00 Vehicle Identification Number Information Malfunction
DTC B1405DTC B1405 02 Control Module Voltage Reference Output 2 Circuit Short to Ground DTC B1405 03 Control Module Voltage Reference Output 2 Circuit Low Voltage DTC B1405 07 Control Module Voltage Reference Output 2 Circuit High Voltage

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
8V ReferenceB1405 02B0958 06, B0959 06, B0960 06, B0961 06, B1405 03B0958 06, B0959 06, B0960 06, B0961 06, B1405 07
Left Rear Object Sensor SignalB0958 06B0958 06B0958 01B0958 08, B0958 21
Left Middle Rear Object Sensor SignalB0959 06B0959 06B0959 01B0959 08, B0959 21
Right Middle Rear Object Sensor SignalB0960 06B0960 06B0960 01B0960 08, B0960 21
Right Rear Object Sensor SignalB0961 06B0961 06B0961 01B0961 08, B0961 21
Low ReferenceB0958 06, B0959 06, B0960 06, B0961 06

Circuit/System Description

The object sensors are 3-wire sensors that are used to determine the distance between the vehicle and an object of interest. The parking assist control module supplies 8 V to the object sensors via the 8 V reference circuit and provides ground via the low reference circuit. The parking assist control module triggers the sensors in a sequential loop. After each sensor transmits, the parking assist control module uses the sensor echo received through the signal circuit to calculate the distance and position of an object.

Conditions for Running the DTC

  1. Ignition ON
  2. The parking assist is activated. The activation takes place through putting in the reverse gear or through operating the park assist switch.

Conditions for Setting the DTC

B0958 01, B0959 01, B0960 01, or B0961 01

The parking assist control module has detected the voltage at the sensor circuit is greater than 9 V or the object sensor is not grounded.

B0958 06, B0959 06, B0960 06, or B0961 06

The parking assist control module has detected the voltage at the sensor circuit less than 0.5 V.

B0958 08, B0959 08, B0960 08, or B0961 08

The parking assist control module has received an invalid signal.

B0958 21, B0959 21, B0960 21, or B0961 21

The object sensor determines no change in the position of an object while the vehicle is in motion.

B0958 3A, B0959 3A, B0960 3A, or B0961 3A

The parking assist control module determines the wrong sensor type is installed.

Action Taken When the DTC Sets

  1. The parking assist is disabled.
  2. The driver information center displays SERVICE PARK ASSIST.

Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

Reference Information

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

  1. Verify that DTC B1405 is not present. If DTC is present, refer to «DTC B1405»(/buick/regal/v-2009-2013/remont/collisionavoidance/#object-detection-system-park-assist-system) .
  2. Verify that DTC B0958 01, B0959 01, B0960 01 or B0961 01 is not present. If DTC is present, check the appropriate sensor for contamination with mud, ice or snow. If no contamination is diagnosed, refer to Circuit/System Testing.
  3. Verify that DTC B0958 21, B0959 21, B0960 21 or B0961 21 is not present. If DTC is present, check the appropriate sensor for contamination with mud, ice or snow. If no contamination is diagnosed, replace the sensor.
  4. Verify that DTC B0958 3A, B0959 3A, B0960 3A or B0961 3A is not present. If DTC is present, replace the appropriate sensor with a sensor of correct sensor type.
  5. Ignition ON, transmission in REVERSE, verify the scan tool Parking Assist System Status parameter displays Enabled.

Circuit/System Testing

Note. Scan Tool must be disconnected for steps 1 and 2 to allow module to power down.

  1. Ignition OFF for 1 min, disconnect the harness connector at the appropriate rear object sensor.
  2. Test for less than 30 ohms between the low reference circuit terminal 2 and ground. If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K41 front and rear parking assist control module.
  3. Ignition ON, activate the parking assist, test for 7.5-9.0 V between the 8 V reference circuit terminal 1 and ground. If less than the specified range, test the 8 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K41 front and rear parking assist control module. If greater than the specified range, test the 8 V reference circuit for short to voltage. If the circuit tests normal, replace the K41 front and rear parking assist control module.
  4. Activate the parking assist, test for 7.5-9.0 V between the signal circuit terminal 3 and ground. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K41 front and rear parking assist control module. If greater than the specified range, test the signal circuit for short to voltage. If the circuit tests normal, replace the K41 front and rear parking assist control module.
  5. If all circuits test normal, replace the appropriate B78 rear object sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Rear Parking Assist Alarm Sensor Replacement»(/buick/regal/v-2009-2013/remont/collisionavoidance/#object-detection-system-park-assist-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for parking assist control module replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Parking Assist Switch SignalB0967 021
Parking Assist Switch Indicator Control11B0968 01
Parking Assist Switch Ground1
1. Parking Assist Switch Malfunction

The parking assist can be activated/deactivated by pressing the parking assist switch. By engaging the reverse gear the parking assist can also be activated. By subsequently pressing the parking assist switch the parking assist can be disabled again.

The indicator in the parking assist switch shows the status of the parking assist. If the lamp is ON, the parking assist is activated.

  1. Ignition ON
  2. The parking assist is activated. The activation takes place by putting in the reverse gear or by pressing the parking assist switch.

B0967 02

The parking assist control module has detected a short to ground.

B0968 01

The parking assist control module has detected a short to battery.

  1. The parking assist is disabled.
  2. The driver information center displays SERVICE PARK ASSIST.

The condition for setting the DTC is no longer present.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Verify that DTC B0967 02 is not present. If DTC is present, refer to Parking Assist Switch Malfunction.
  2. Verify that B0968 01 is not present. If DTC is present, refer to Parking Assist Switch Indicator Malfunction in «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/collisionavoidance/#object-detection-system-park-assist-system) .
  3. Activate and deactivate the parking assist switch and verify the scan tool Park Assist Switch parameter changes between Active and Inactive.

Parking Assist Switch Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the S107 parking assist disable switch.
  2. Test for less than 10 ohms between the S107 parking assist disable switch ground circuit terminal 2 and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for 11-13 V between the reference circuit terminal 5 at the S107 parking assist disable switch harness connector and ground. If less than the specified range, test the reference circuit for a short to ground or an open/high resistance. If circuit tests normal, replace the K41 front and rear parking assist control module.
  4. If all circuits test normal, replace the S107 parking assist disable switch.

Parking Assist Switch Indicator Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the S107 parking assist disable switch.
  2. Ignition ON, transmission in REVERSE, test for 0.05-0.15 V between the signal terminal 6 at the S107 parking assist disable switch harness connector and ground. If less than the specified range, test signal circuit for a short to ground or an open/high resistance. If circuit tests normal, replace K41 front and rear parking assist control module. If greater than the specified range, test signal circuit for short to voltage. If circuit tests normal, replace K41 front and rear parking assist control module.
  3. If all circuits test normal, replace the S107 parking assist disable switch.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Instrument Panel Multifunction Switch Replacement»(/buick/regal/v-2009-2013/remont/exterior-lights/#lighting-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for parking assist control module replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When the ignition is turned ON, the parking assist control module receives the vehicle identification number (VIN) from the body control module. The parking assist control module will compare the VIN received to the VIN stored in memory.

Ignition voltage is between 9-16 V.

The VIN stored in the parking assist control module does not match the received VIN.

  1. The parking assist is disabled.
  2. The driver information center displays SERVICE PARK ASSIST.

The VIN stored in the parking assist control module matches the VIN stored in the body control module.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, program the K41 Parking Assist Control Module and verify the DTC does not reset.

  1. If the DTC is reset, replace the K41 Parking Assist Control Module

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for parking assist control module replacement, setup and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
8V ReferenceB1405 02B0958 06, B0959 06, B0960 06, B0961 06, B1405 03B0958 06, B0959 06, B0960 06, B0961 06, B1405 07
Left Rear Object Sensor SignalB0958 06B0958 06B0958 01B0958 08, B0958 21
Left Middle Rear Object Sensor SignalB0959 06B0959 06B0959 01B0959 08, B0959 21
Right Middle Rear Object Sensor SignalB0960 06B0960 06B0960 01B0960 08, B0960 21
Right Rear Object Sensor SignalB0961 06B0961 06B0961 01B0961 08, B0961 21
Low ReferenceB0958 06, B0959 06, B0960 06, B0961 06

The object sensors are 3-wire sensors that are used to determine the distance between the vehicle and an object of interest. The parking assist control module supplies 8 V to the object sensors via the 8 V reference circuit and provides ground via the low reference circuit. The parking assist control module triggers the sensors in a sequential loop. After each sensor transmits, the parking assist control module uses the sensor echo received through the signal circuit to calculate the distance and position of an object.

  1. Ignition ON
  2. Transmission in REVERSE

B1405 02

The parking assist control module has detected the 8 V reference circuit is shorted to ground.

B1405 03

The parking assist control module has detected the 8 V reference circuit is less than 6.3 V.

B1405 07

The parking assist control module has detected the 8 V reference circuit is greater than 10.4 V.

  1. The parking assist is disabled.
  2. The driver information center displays SERVICE PARK ASSIST.

The condition for setting the DTC is no longer present.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, transmission in REVERSE, observe the scan tool Park Assist Sensors Reference Voltage parameter. The reading should be between 6.3-10.4 V.

  1. Ignition OFF, disconnect the harness connector at each of the object sensors.
  2. Ignition ON, transmission in REVERSE, test for 6.3-10.4 V between the 8 V reference circuit terminal 1 at the B78G Rear Object Sensor - Left Outer harness connector and ground. If less than the specified range, test the 8 V reference circuit for a short to ground. If the circuit tests normal, replace the K41 Parking Assist Control Module. If greater than the specified range, test the 8 V reference circuit for a short to voltage. If the circuit tests normal, replace the K41 Parking Assist Control Module.
  3. Install each object alarm sensor harness connector one at a time, checking DTCs after each sensor is connected. Verify DTC B1405 is not set as current. If the DTC is set, replace the object alarm sensor that was connected immediately before the DTC set.
  4. If all circuits test normal, replace the K41 Parking Assist Control Module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Rear Parking Assist Alarm Sensor Replacement»(/buick/regal/v-2009-2013/remont/collisionavoidance/#object-detection-system-park-assist-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for parking assist control module replacement, setup and programming

Symptoms - Object Detection

Note. The following steps must be completed before using the symptom tables

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
  2. Review the system operation in order to familiarize yourself with the system functions. Refer to «Object Detection Description and Operation»(/buick/regal/v-2009-2013/remont/collisionavoidance/#object-detection-system-park-assist-system__object-detection-description-and-operation) .

Visual/Physical Inspection

  1. Inspect for aftermarket devices which may affect the operation of the system. Refer to «Checking Aftermarket Accessories»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which may cause the symptom.
  3. Make sure the parking assist sensors located on the rear bumper are clear. Remove any snow, mud or ice that is blocking the sensors.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Parking Assist Switch SignalB0967 021
Parking Assist Switch Indicator Control11B0968 01
Parking Assist Switch Ground1
1. Parking Assist Switch Malfunction

The ultrasonic parking assist system is designed to identify and notify the driver of an object in the vehicle path when reversing at speeds of less than 8 km/h (5 mph). The distance and location of the object is determined by four object sensors located in the rear bumper. The parking assist system will notify the driver using an audible signal through the radio.

Diagnostic Aids

The scan tool Park Assist Disable History parameters are a list of the seven previous reasons the parking assist system was disabled. These parameters may help in the diagnosis of an intermittent concern or a customer concern which is the result of normal system operation. The following is a brief description of potential causes which may aid in diagnosis

  1. Manual Disable - The parking assist system has been disabled through the parking assist switch or audio system personalization menu.
  2. Hitch/Object Attached - The parking assist control module is detecting an object that is attached to the vehicle. Common items such as a hitch receiver, trailer, or a bicycle rack may cause this concern. Additionally, damage to the rear of the vehicle or a misaligned sensor may cause this concern. If the vehicle is damaged in a manner that causes the sensor to detect the bumper itself, the parking assist control module will interpret this as an attached object and disable the system. Carefully inspect the bumper, bumper mounting surface, and sensor retainers before continuing with normal diagnosis. After the detected cause has been addressed the vehicle must be driven at speed greater than 40 km/h (25 mph).
  3. Reverse Overspeed - The vehicle is travelling too fast in reverse at speeds of greater than 8 km/h (5 mph).
  4. Inhibit - The parking assist control module has lost or received invalid GMLAN signal(s).
  5. Sensor Disturbance - An outside interference is causing sensor movement. Such interference may be caused a heavy pounding, like that of a nearby jackhammer, or large changes in pressure, such as a large truck air brakes.
  6. Sensor Ring Time - If the sensor fails its own diagnostic initialization the parking assist control module will set this error. After the detected cause has been addressed the vehicle must be driven at speed greater than 40 km/h (25 mph). The following is a list of reasons this cause may have set: One or more of the sensors may be blocked by snow, mud, ice, or other debris. This might happen after going through a car wash in cold weather. Silicone insulator surrounding sensor maybe missing, cut, or twisted. Improperly installed sensor, sensor maybe be crooked due to a tight wire harness. One or more of the sensors may be scratched or the paint maybe chipped. Extreme paint thickness on a sensor may cause an extreme sensor ring time. When replacing or refinishing a sensor, do not apply an extreme amount of paint or clear coat.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, verify the park assist system is enabled through the parking assist switch. If the park assist system is manually disabled, enable the system. Refer to the vehicle owners manual for instructions on enabling the system.
  2. Observe the scan tool Park Assist Switch parameter while pressing and releasing the parking assist switch. The parameter should change between Active and Inactive. If the parameter does not change between the specified values, refer to Parking Assist Switch Circuit Malfunction in «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/collisionavoidance/#object-detection-system-park-assist-system) .
  3. Activate the park assist switch ON and OFF with the transmission in REVERSE. The parking assist switch indicator should turn ON and OFF when changing between the commanded states. If the indicator does not turn ON and OFF, refer to Parking Assist Switch Indicator Circuit Malfunction in «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/collisionavoidance/#object-detection-system-park-assist-system) .
  4. Transmission in REVERSE, verify the scan tool Park Assist System Status parameter is Enable. NOTE: After completing the next step the vehicle might need to be driven in the forward direction at speed greater than 40 km/h (25 mph). If not the specified value, refer to Diagnostic Aids and the scan tool Park Assist Disable History parameters to determine the cause of the inhibit.

Parking Assist Switch Circuit Malfunction

  1. Ignition OFF for 1 minute, disconnect the harness connector at the S107 parking assist disable switch.
  2. Test for less than 10 ohms between the S107 parking assist disable switch ground circuit terminal 2 and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for 11-13 V between the reference circuit terminal 5 at the S107 parking assist disable switch harness connector and ground. If less than the specified range, test the reference circuit for a short to ground or an open/high resistance. If circuit tests normal, replace the K41 front and rear parking assist control module.
  4. If all circuits test normal, replace the S107 parking assist disable switch.

Parking Assist Switch Indicator Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the S107 parking assist disable switch.
  2. Ignition ON, transmission in REVERSE, test for 0.05-0.15 V between the signal terminal 6 at the S107 parking assist disable switch harness connector and ground. If less than the specified range, test signal circuit for a short to ground or an open/high resistance. If circuit tests normal, replace K41 front and rear parking assist control module. If greater than the specified range, test signal circuit for short to voltage. If circuit tests normal, replace K41 front and rear parking assist control module.
  3. If all circuits test normal, replace the S107 parking assist disable switch.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Instrument Panel Multifunction Switch Replacement»(/buick/regal/v-2009-2013/remont/exterior-lights/#lighting-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for parking assist control module replacement, programming and setup

Scheme 2

Scheme 2: Rear Object Alarm Control Module Replacement
Scheme 2: Rear Object Alarm Control Module Replacement
CalloutComponent Name
Preliminary Procedure Remove the rear compartment side trim panel. Refer to Rear Compartment Side Trim Panel Replacement (without HP6) , Rear Compartment Side Trim Panel Replacement (HP6, Left Side) , Rear Compartment Side Trim Panel Replacement (HP6, Right Side) .
1Rear Object Alarm Module Assembly Procedure Disconnect the electrical connectors. Release the locking retainer from the front and rear object alarm module bracket. For programming and set up, refer to Control Module References .

Rear Object Alarm Control Module Replacement

Scheme 3

Scheme 3: Rear Parking Assist Alarm Sensor Replacement
Scheme 3: Rear Parking Assist Alarm Sensor Replacement
CalloutComponent Name
Preliminary Procedure Remove the rear bumper fascia. Refer to Rear Bumper Fascia Replacement .
1Rear Object Sensor Retainer (Qty: 2) Procedure Disconnect the rear object sensor electrical connector. Release the locking retainer from the rear object sensor support.
2Rear Object Sensor

Rear Parking Assist Alarm Sensor Replacement

Scheme 4

Scheme 4: Side Object Sensor Bracket Replacement
Scheme 4: Side Object Sensor Bracket Replacement
CalloutComponent Name
Preliminary Procedure Remove the rear fascia. Refer to Rear Bumper Fascia Replacement .
1Side Object Sensor Bracket Procedure Remove the side object sensor from the bracket. Sand/grind the sonic weld plastic residue from the fascia and bracket. Clean the mounting surfaces with an alcohol wipe and allow to dry. Apply adhesion promoter, using the sponge applicator, following the manufacturer directions. Apply 2 pieces 40 mm (1 1/2 in) of acrylic plus attachment tape, black, to the bracket following the manufacturer directions. Install the side object sensor bracket to the rear fascia. Install the side object sensor. Install the rear fascia.

Side Object Sensor Bracket Replacement

Object Detection Description and Operation

The ultrasonic parking assist system is designed to identify and notify the driver of an object in the vehicle's path when reversing at speeds of less than 8 km/h (5 MPH). The distance and location of the object is determined by 4 object sensors located in the rear bumper. The parking assist system will notify the driver using an audible beep signal through the radio.

The parking assist system is made up of the following components

  1. Parking assist control module
  2. Rear object alarm sensors
  3. Parking assist switch
  4. Parking assist switch indicator

Parking Assist Control Module

The parking assist control module provides an 8 V reference and a low reference to the four object alarm sensors. The parking assist control module receives individual signals from each of the four sensors and determines the location and distance of an object based on these inputs. When an object is detected, the parking assist control module will send a data message via CAN-Bus to the radio requesting an audible alert.

Rear Object Alarm Sensors

The object alarm sensors are located in the rear bumper of the vehicle. The sensors are used to determine the distance between an object and the bumper. Each sensor emits an ultrasonic frequency which is reflected off any object located behind the vehicle. These reflections are received by the sensors. The time difference between the emission of the frequency and when the reflection is received is known as sensor echo time, it is used to determine the distance to the object. The sensors report this information to the parking assist control module.

Parking Assist Switch

The parking assist can be activated and deactivated by pressing the parking assist switch. By engaging the reverse gear the parking assist can also be activated. By subsequently pressing the parking assist switch the parking assist can be disabled again.

Parking Assist Switch Indicator

The indicator in the parking assist switch shows the status of the parking assist. If the lamp is ON, the parking assist is activated.

Rear Parking Assist Operation

When an object is within the measuring range of the sensor, the ultrasonic pulse is reflected and is received by the sending or a neighboring sensor. The sensor converts this signal into a voltage signal and sends this signal to the parking assist control module. The parking assist control module evaluates the received sensor signals. As soon as an object is within the measuring range, the parking assist control module sends a message to the radio in order to give out the acoustic distance signal. If an object is detected within 2.5 m (8 ft) away from the rear bumper, there will be an audible beep out of the speakers. As the vehicle gets closer to an object, the time between the beeps becomes shorter. If the vehicle stops and there is an object within 2.5 m (8 ft) away from the rear bumper the beeping will stop after 5 s. When the distance between the object and the vehicle starts to decrease again the beeping will start again. From a distance less than 30 cm (9.84 in), the sound becomes continuous.

The rear parking assist system can detect objects greater than 7.6 cm (3 in) wide and 25.4 cm (10 in) tall. The system cannot detect objects below the bumper, underneath the vehicle.

The parking assist can be activated and deactivated by pressing the parking assist switch. By engaging the reverse gear the parking assist can also be activated. By subsequently pressing the parking assist switch the parking assist can be disabled again.

The parking assist control module carries out a self test and monitors the sensors for electrical and mechanical faults. Monitored is the power supply of each sensor and the sensor signals, which need to alter when the vehicle moves. If this is not the case, the sensor is acoustically blocked or faulty. Mud, ice and snow may cause obstruction of the function of the sensors. Besides that the parking assist control module checks whether the correct type of sensor is installed. If any of these tests fails, a DTC with corresponding symptom is set, the parking assist is deactivated and the parking assist control module will send a serial data message to display the SERVICE PARK ASSIST message on the driver information center.

Rear Parking Assist System Driver Information Center Messages

SERVICE PARK ASSIST

The driver information center displays SERVICE PARK ASSIST when the parking assist control module detects a malfunction in the rear parking assist system and the system is disabled. The driver information center also displays SERVICE PARK ASSIST when a loss of communication occurs with the parking assist control module.

PARK ASSIST OFF

The PARK ASSIST OFF message is displayed in the driver information center when the parking assist system is disabled due to conditions that disable or inhibit the system. The parking assist control module requests the driver information center display PARK ASSIST OFF when it detects that one of the following conditions

  1. The rear parking assist system is manually disabled by the vehicle operator through the parking assist switch or audio system personalization menu.
  2. An object is attached to the rear of the vehicle, such as a trailer, bicycle rack, trailer hitch receiver, or tow bar. Also, an object extending beyond a lowered endgate will disable the system.
  3. The parking assist sensors are covered by snow, mud, dirt, slush, or ice.
  4. The vehicle bumper is damaged.
  5. Excessive paint thickness on a replacement parking assist sensor.
  6. The parking assist sensors are disrupted by vibrations, like those caused by a large nearby vehicle or from heavy equipment such as a jackhammer.