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Object Detection System - Park Assist System Chevrolet Express G3500

Collision/avoidance 7 illustrations ~6464 words

Scheme 1

Scheme 1: Rear Vision Camera (without UYS) Wiring Schematics
Scheme 1: Rear Vision Camera (without UYS) Wiring Schematics

Scheme 2

Scheme 2: Rear Vision Camera (with UYS) Wiring Schematics
Scheme 2: Rear Vision Camera (with UYS) Wiring Schematics

Scheme 3

Scheme 3: Rear Object Sensing Power, Ground, and Serial Data (UD7) Wiring Schematics
Scheme 3: Rear Object Sensing Power, Ground, and Serial Data (UD7) Wiring Schematics

Scheme 4

Scheme 4: Rear Object Sensors (UD7) Wiring Schematics
Scheme 4: Rear Object Sensors (UD7) Wiring Schematics

Diagnostic Code Index

DTCDescription
DTC B0010DTC B0010 00 Reverse Gear Signal Circuit
DTC B0958, B0959, B0960, or B0961DTC B0958 01 Parking Assist Rear Sensor Left Corner Circuit Short to Battery DTC B0958 06 Parking Assist Rear Sensor Left Corner Circuit Low Voltage/Open DTC B0958 08 Parking Assist Rear Sensor Left Corner Circuit Performance - Signal Invalid DTC B0958 21 Parking Assist Rear Sensor Left Corner Circuit Incorrect Period DTC B0958 3A Parking Assist Rear Sensor Left Corner Circuit Incorrect Component Installed DTC B0959 01 Parking Assist Rear Sensor Left Middle Circuit Short to Battery DTC B0959 06 Parking Assist Rear Sensor Left Middle Circuit Low Voltage/Open DTC B0959 08 Parking Assist Rear Sensor Left Middle Circuit Performance - Signal Invalid DTC B0959 21 Parking Assist Rear Sensor Left Middle Circuit Incorrect Period DTC B0959 3A Parking Assist Rear Sensor Left Middle Circuit Incorrect Component Installed DTC B0960 01 Parking Assist Rear Sensor Right Middle Circuit Short to Battery DTC B0960 06 Parking Assist Rear Sensor Right Middle Circuit Low Voltage/Open DTC B0960 08 Parking Assist Rear Sensor Right Middle Circuit Performance - Signal Invalid DTC B0960 21 Parking Assist Rear Sensor Right Middle Circuit Incorrect Period DTC B0960 3A Parking Assist Rear Sensor Right Middle Circuit Incorrect Component Installed DTC B0961 01 Parking Assist Rear Sensor Right Corner Circuit Short to Battery DTC B0961 06 Parking Assist Rear Sensor Right Corner Circuit Low Voltage/Open DTC B0961 08 Parking Assist Rear Sensor Right Corner Circuit Performance - Signal Invalid DTC B0961 21 Parking Assist Rear Sensor Right Corner Circuit Incorrect Period DTC B0961 3A Parking Assist Rear Sensor Right Corner Circuit Incorrect Component Installed
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»(/chevrolet/express-g3500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g3500/2013-2013/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»(/chevrolet/express-g3500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit/System Description

The body control module (BCM) supplies B+ to the rearview camera when the transmission is placed into reverse.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts

Conditions for Setting the DTC

The BCM detects there is a short to ground or an open circuit.

Action Taken When the DTC Sets

Rearview camera is disabled.

Conditions for Clearing

  1. The DTC will transition to history when the fault is no longer present.
  2. A history DTC will clear after 100 malfunction-free ignition cycles.

Reference Information

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the rearview camera.
  2. Ignition ON, park brake applied, transmission in REVERSE, test for B+ between the B+ circuit terminal 3 and ground. If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance.
  3. If all circuits test normal, replace the BCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g3500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g3500/2013-2013/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»(/chevrolet/express-g3500/2013-2013/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
8 V ReferenceB1405 02B0954 06, B0955 06, B0956 06, B0957 06, B0958 06, B0959 06, B0960 06, B0961 06, B1405 03B0954 06, B0955 06, B0956 06, B0957 06, B0958 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 ReferenceB0954 01, B0955 01, B0956 01, B0957 01, B0958 01, B0959 01, B0960 01, B0961 01

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, engine running.
  2. The parking assist is activated. The activation takes place through putting the vehicle in reverse.

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 11.5 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.

  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.

Diagnostic Aids

For symptom byte 21 the module only runs diagnostic when the vehicle is driven greater than 40 km/h (25 MPH). Therefore, even with clean sensor with no obstruction (i.e snow or ice melted off) drive the vehicle greater than 40 km/h (25 MPH).

The following is a list of reasons this failure type byte 21 might have set

  1. One or more of the sensors may be blocked by snow, mud, ice or debris. This might happen after going through a car wash in cold weather.
  2. Silicone insulator surrounding sensor maybe missing, cut or twisted.
  3. Improperly installed sensor, sensor maybe be crooked due to a tight wire harness.
  4. One or more of the sensors may be scratched or the paint maybe chipped.
  5. Excessive paint thickness on a sensor may cause an excessive sensor ring time. When replacing or refinishing a sensor, do not apply an excessive amount of paint or clear coat.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g3500/2013-2013/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. Ignition ON.
  2. Verify that DTC B1405 is not set. If the DTC is set Refer to «DTC B1405»(/chevrolet/express-g3500/2013-2013/remont/collisionavoidance/#object-detection-system-park-assist-system) If the DTC is not set
  3. Verify that DTC B0958 01, B0959 01, B0960 01, B0961 01, B0958 21, B0959 21, B0960 21 or B0961 21 is not set. If the DTC is set Check the B78 Rear Object Sensor for contamination with snow, mud, dirt, slush, or ice. If contaminated, clean sensor. If there is no contamination Refer to Circuit/System Testing below. If the DTC is not set
  4. Verify that DTC B0958 3A, B0959 3A, B0960 3A or B0961 3A is not set. If the DTC is set Replace the B78 Rear Object Sensor with the correct sensor type.
  5. Ignition ON, engine running, transmission in REVERSE.
  6. Verify the scan tool Parking Assist System Status parameter displays Enabled. If the Parking Assist System displays Disabled Refer to Circuit/System Testing below. If the Parking Assist System displays Enabled
  7. All OK.
  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 ohms between the low reference circuit terminal 2 and ground. If 10 ohms or greater Ignition OFF, disconnect the harness connector X2 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. Test for 7.5-9.5 V between the signal 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 signal 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 signal 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 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.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Rear Object Sensor Alarm Assembly Replacement»(/chevrolet/express-g3500/2013-2013/remont/collisionavoidance/#object-detection-system-park-assist-system)
  2. «Control Module References»(/chevrolet/express-g3500/2013-2013/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»(/chevrolet/express-g3500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g3500/2013-2013/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»(/chevrolet/express-g3500/2013-2013/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 advanced rear parking assist control module and the vehicle direction camera control module receives the vehicle identification number (VIN) from the body control module. The advanced control module will compare the VIN received to the VIN stored in memory.

Ignition voltage is between 9-16 V.

The stored VIN does not match the received VIN.

  1. The parking assist system or the lane departure warning system is disabled.
  2. The driver information center displays SERVICE PARK ASSIST or SERVICE LANE DEPARTURE SYSTEM.

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

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g3500/2013-2013/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.
  2. Verify the DTC B1015 is not. If the DTC B1015 is set Program the control module the DTC originally set in. Verify the DTC does not set. If the DTC is sets, replace the control module the DTC set in. If the DTC does not set All OK If the DTC B1015 is not set
  3. All OK

Perform the Diagnostic Repair Verification after completing the repair

Control Module References for the rear parking assist control module, vehicle direction camera control module replacement, programming and setup.

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g3500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g3500/2013-2013/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»(/chevrolet/express-g3500/2013-2013/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
8 V 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 01, B0959 01, B0960 01, B0961 01

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 object sensor supply voltage circuit and provides ground via the object sensor 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 object sensor signal circuit to calculate the distance and position of an object.

  1. Ignition ON, engine RUNNING
  2. Transmission in REVERSE

B1405 02

The parking assist control module has detected the object sensor supply voltage circuit is shorted to ground.

B1405 03

The parking assist control module has detected the object sensor supply voltage circuit is less than 7.2 V.

B1405 07

The parking assist control module has detected the object sensor supply voltage circuit is greater than 9.2 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»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g3500/2013-2013/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, engine running, transmission in R.
  2. Verify the scan tool Park Assist Sensor Reference Voltage parameter is between 7.2-9.2 V. If Park Assist Sensor Reference Voltage is not between 7.2-9.2 V Refer to Circuit/System Testing below If Park Assist Sensor Reference Voltage is between 7.2-9.2 V
  3. All OK.
  1. Ignition OFF, disconnect the X2 harness connector at the K41 Front and Rear Parking Assist Control Module, ignition ON.
  2. Test for less than 1 V between the 8 V reference circuit terminal 4 and ground. If 1 V or greater Repair the short to voltage on the circuit. If less than 1 V
  3. Ignition OFF.
  4. Test for infinite resistance between the 8 V reference circuit terminal 4 and ground. If less than infinite resistance Repair the short to ground on the circuit. If infinite resistance
  5. Replace the K41 Front and Rear Parking Assist Control Module.

Perform the Diagnostic Repair Verification after completing the repair.

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

Symptoms - Object Detection

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

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g3500/2013-2013/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. NOTE: The rear vision camera does not communicate on the serial data bus. 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 (with rear camera UVC)»(/chevrolet/express-g3500/2013-2013/remont/collisionavoidance/#object-detection-system-park-assist-system) , «Object Detection Description and Operation (with rear park assist UD7)»(/chevrolet/express-g3500/2013-2013/remont/collisionavoidance/#object-detection-system-park-assist-system__object-detection-description-and-operation-with) .

Visual/Physical Inspection

  1. Inspect for aftermarket devices which may affect the operation of the system. Refer to «Checking Aftermarket Accessories»(/chevrolet/express-g3500/2013-2013/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. 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 Rear vision camera lens

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. «Parking Assist System Malfunction»(/chevrolet/express-g3500/2013-2013/remont/collisionavoidance/#object-detection-system-park-assist-system)
  2. «Rear Vision Camera System Malfunction (with navigation radio UYS)»(/chevrolet/express-g3500/2013-2013/remont/collisionavoidance/#object-detection-system-park-assist-system) , «Rear Vision Camera System Malfunction (without navigation radio UYS)»(/chevrolet/express-g3500/2013-2013/remont/collisionavoidance/#object-detection-system-park-assist-system)
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g3500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g3500/2013-2013/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»(/chevrolet/express-g3500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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 four object sensors located in the rear bumper. The parking assist system will notify the driver using an audible signal through the radio.

When the "Park Assist Off" or "Service Park Assist" message is displayed in the DIC the disable reason is stored in the Park Assist Disable History.

The scan tool Park Assist Disable History parameters are a list of the 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 system personalization menu. Refer to Owner's Manual for more information.
  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, object hanging out of tailgate, lowered tailgate, or a bicycle rack may cause this concern. If the customer does have a ball mount attached to the factory hitch, then refer to Owners Manual and "Vehicle Personalization" to enable "Towbar" option. 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's 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. Excessive paint thickness on a sensor may cause an excessive sensor ring time. When replacing or refinishing a sensor, do not apply an excessive amount of paint or clear coat.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g3500/2013-2013/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

Manual Transmission

  1. Engine running, transmission in REVERSE.
  2. Verify the scan tool Calculated Transmission Range parameter is Reverse. If parameter is not Reverse Refer to «Backup Lamps Malfunction»(/chevrolet/express-g3500/2013-2013/remont/exterior-lights/#lighting-system) . If parameter is Reverse
  3. Verify the scan tool Park Assist System Status parameter displays 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 status is not Enable Refer to Diagnostic Aids and the scan tool Park Assist Disable History parameters to determine the cause of the inhibit. If status is Enable
  4. Replace the K41 Parking Assist Control Module.

Automatic Transmission

  1. Engine running, transmission in REVERSE.
  2. Verify the scan tool Park Assist System Status parameter displays 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 status is not Enable Refer to Diagnostic Aids and the scan tool Park Assist Disable History parameters to determine the cause of the inhibit. If status is Enable
  3. Replace the K41 Parking Assist Control Module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for module replacement, programming and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g3500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g3500/2013-2013/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»(/chevrolet/express-g3500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When the transmission is placed into REVERSE, a 12 V signal is sent to the rearview camera indicating that camera operation is requested. Ignition voltage and ground are supplied to the rearview camera. The rearview camera sends video information to the radio through a video signal + and a video signal - circuit. A grounded shielding also wraps the video signal circuits to reduce electronic interference which may degrade the video signal and cause a distorted or otherwise degraded image.

A poor video image can be caused by ice, snow, and mud buildup on the lens of the rearview camera. Also, extreme lighting conditions can affect performance, such as operating in the dark or with bright sunlight shining on the camera. Extreme high or low temperatures can also affect the image quality. An open in the shield of the video signal circuit can also cause a distorted screen.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g3500/2013-2013/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.
  2. Verify that DTC B2545 is not set. If the DTC is set Refer to «DTC B2545»(/chevrolet/express-g3500/2013-2013/remont/exterior-lights/#lighting-system) . If the DTC is not set
  3. Verify the rearview camera has no debris on the lens and that the bezel or bezel seal is not damaged. If debris is found on the lens Clean the lens. If the lens, bezel, or bezel seal are damaged, replace as necessary. If no debris on the lens
  4. Ignition ON, transmission in REVERSE.
  5. Verify the backup lamps are On. If the backup lamps are not ON Refer to «Backup Lamps Malfunction»(/chevrolet/express-g3500/2013-2013/remont/exterior-lights/#lighting-system) . If the backup lamps are ON
  6. Engine running, transmission in REVERSE.
  7. Verify a clear rear vision image is displayed on the radio. If a clear image is not displayed Refer to Circuit/System Testing below. If a clear image is displayed
  8. All OK.

Note. Circuit/System Verification must be performed before Circuit/System Testing.

  1. Ignition OFF, disconnect the harness connector at the Rearview Camera.
  2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
  3. Ignition ON.
  4. Verify a test lamp illuminates between the ignition circuit terminal 6 and ground. If the test lamp does not illuminate 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 circuit tests normal, test or replace the RUN/CRNK Relay. If the test lamp illuminates
  5. Engine running, park brake applied, transmission in REVERSE.
  6. Verify a test lamp illuminates between the control circuit terminal 3 and ground. If the test lamp does not illuminate Ignition OFF, disconnect the X5 harness connector at the 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 Body Control Module. If the test lamp illuminates
  7. Ignition OFF, disconnect the X4 harness connector at the Radio, ignition ON.
  8. Test for less than 1 V between the signal circuit terminal listed below and ground: Signal (+) circuit terminal 1 at the Rearview Camera. Signal (-) circuit terminal 4 at the Rearview Camera. If 1 V or greater Repair the short to voltage on the circuit. If less than 1 V
  9. Test for infinite resistance between the signal circuit terminal listed below and ground: Signal (+) circuit terminal 1 at the Rearview Camera. Signal (-) circuit terminal 4 at the Rearview Camera. If less than infinite resistance Repair the short to ground on the circuit. If infinite resistance
  10. Test for less than 2 ohms in the signal (+) circuit end to end. If 2 ohms or greater Repair the open/high resistance in the circuit. If less than 2 ohms
  11. Test for less than 2 ohms in the signal (-) circuit end to end. If 2 ohms or greater Test the signal circuit for an open/high resistance. If less than 2 ohms
  12. Replace the Rearview Camera.
  13. Engine running, transmission in REVERSE, verify a clear rear vision image is displayed on the Radio. If a clear rear vision image is not displayed on the Radio Replace the Radio. If a clear rear vision image displayed on the Radio
  14. All Ok.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Rearview Camera Image Display Module Replacement»(/chevrolet/express-g3500/2013-2013/remont/collisionavoidance/#object-detection-system-park-assist-system)
  2. «Control Module References»(/chevrolet/express-g3500/2013-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for body control module or radio replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/express-g3500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/express-g3500/2013-2013/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»(/chevrolet/express-g3500/2013-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When the transmission is placed into REVERSE while engine is running, a 12 V signal is sent to the inside rearview mirror and rearview camera indicating that camera operation is requested. Ignition voltage and ground are supplied to the rearview camera; the inside rearview mirror is supplied a common ignition voltage and ground source that is shared with other mirror operations. The rearview camera sends video information to the inside rearview mirror through a video signal + and a video signal - circuit. A grounded shielding also wraps the video signal circuits to reduce electronic interference which may degrade the video signal and cause a distorted or otherwise degraded image.

A poor video image can be caused by ice, snow, and mud buildup on the lens of the rearview camera. Also, extreme lighting conditions can affect performance, such as operating in the dark or with bright sunlight shining on the camera. Extreme high or low temperatures can also affect the image quality.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/express-g3500/2013-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)
  1. Verify there is no debris on the rearview camera lens. If debris is found on the lens Clean the debris from the lens. If no debris is found on the lens
  2. Engine running, transmission in park.
  3. Verify the backup lamps are not ON. If the backup lamps are ON Refer to Rearview Camera System Always On below. If the backup lamps are not ON
  4. Engine running with the drive wheels chocked, set the park brake and place the transmission in reverse.
  5. Verify backup lamps are ON. If the backup lamps are not ON Refer to «Backup Lamps Malfunction»(/chevrolet/express-g3500/2013-2013/remont/exterior-lights/#lighting-system) . If the backup lamps are ON
  6. Verify a clear rear vision image is displayed on the inside rearview mirror. If a clear image is not displayed Refer to Rearview Camera System Does Not Display below. If a clear image is displayed
  7. All OK.

Rearview Camera System Always On

  1. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the Rearview Camera.
  2. Engine running, transmission in park.
  3. Verify a test lamp does not illuminate between the control circuit terminal 3 and ground. If the test lamp illuminates Ignition OFF, disconnect the harness connector at the body control module (BCM) and Inside Rearview Mirror, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage in the circuit. If less than 1 V, refer to «Backup Lamps Malfunction»(/chevrolet/express-g3500/2013-2013/remont/exterior-lights/#lighting-system) . If the test lamp does not illuminate
  4. Replace the Rearview Camera.

Rearview Camera System Does Not Display

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the Inside Rearview Mirror. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 ohms between the ground circuit terminal 8 and ground. If 5 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 5 ohms
  3. Ignition ON.
  4. Verify a test lamp illuminates between the ignition circuit terminal 13 and ground. If the test lamp does not illuminate 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 circuit tests normal, test or replace the RUN/CRNK Relay. If the test lamp illuminates
  5. Engine running with the drive wheels chocked, set the park brake and place the transmission in reverse.
  6. Verify a test lamp illuminates between the control circuit terminal 9 and ground. If the test lamp does not illuminate Ignition OFF, disconnect the X7 harness connector at the BCM and the X1 harness connector at the Rearview Camera 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, refer to «Backup Lamps Malfunction»(/chevrolet/express-g3500/2013-2013/remont/exterior-lights/#lighting-system) . If the test lamp illuminates
  7. Ignition OFF, connect a DMM between the signal circuit terminal 6 and the signal circuit terminal 7. Set the DMM to the AC voltage mode and press the Hz button to measure frequency.
  8. Engine running with the drive wheels chocked, set the park brake and place the transmission in reverse.
  9. Verify the frequency is between 1k-100 kHz. If the frequency is not between 1k-100 kHz Ignition OFF, disconnect the X1 harness connector at the Rearview Camera. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohms between the ground circuit terminal 5 and ground. If 5 ohms or greater, test the ground circuit for an open/high resistance. If less than 5 ohms Ignition ON. Verify a test lamp illuminates between the ignition circuit terminal 6 and ground. If the test lamp does not illuminate and the circuit fuse is good, test the ignition circuit for an open/high resistance. If the test lamp does not illuminate and the circuit fuse is open, test the ignition circuit for a short to ground. If the circuit tests normal, replace the Rearview Camera. If the test lamp illuminates Engine running with the drive wheels chocked, set the park brake and place the transmission in reverse. Verify a test lamp illuminates between the control circuit terminal 3 and ground. If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. If the test lamp illuminates. Ignition ON. Test for less than 1 V between the signal circuits listed below and ground. Terminal 1 Terminal 4 If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V. Ignition OFF. Test for infinite resistance between the signal circuits listed below and ground. Terminal 1 Terminal 4 If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance. Test for less than 2 ohms between the terminals listed below. Rearview Camera signal circuit terminal 1 and the Inside Rearview Mirror signal circuit terminal 6 Rearview Camera signal circuit terminal 4 and the Inside Rearview Mirror signal circuit terminal 7 If 2 ohms or greater, repair the open/high resistance on the circuit. If less than 2 ohms. Replace the Rearview Camera. If the frequency is between 1k-100 kHz
  10. Connect the harness connector at the Inside Rearview Mirror.
  11. Engine running with the drive wheels chocked, set the park brake and place the transmission in reverse.
  12. Verify a clear rear vision image is displayed on the Inside Rearview Mirror. If a clear image is not displayed Replace the Inside Rearview Mirror. If a clear image is displayed
  13. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Rearview Camera Image Display Module Replacement»(/chevrolet/express-g3500/2013-2013/remont/collisionavoidance/#object-detection-system-park-assist-system)
  2. «Control Module References»(/chevrolet/express-g3500/2013-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for inside rearview mirror replacement, programming and setup

Scheme 5

Scheme 5: Rear Object Sensor Alarm Assembly Replacement
Scheme 5: Rear Object Sensor Alarm Assembly Replacement
CalloutComponent Name
Preliminary Procedure Raise and support the vehicle. Refer to. Lifting and Jacking the Vehicle
1Rear Object Sensor Alarm Assembly Procedure Disconnect the electrical connector. Lift the locking tabs on the housing and remove the rear object sensor. NOTE: The rear object sensor is a one piece design. Do NOT twist the sensor cap to try and remove the cap.
NOTE
The rear object sensor is a one piece design. Do NOT twist the sensor cap to try and remove the cap.

Rear Object Sensor Alarm Assembly Replacement

Scheme 6

Scheme 6: Rear Object Alarm Control Module Replacement
Scheme 6: Rear Object Alarm Control Module Replacement
CalloutComponent Name
Preliminary Procedure Remove the instrument panel upper trim panel. Refer to Instrument Panel Upper Trim Pad Replacement .
1Rear Object Alarm Control Module Retainer (Qty: 3)
2Rear Object Alarm Control Module Procedure Disconnect the electrical connector. For programming and set up, refer to Control Module References .

Rear Object Alarm Control Module Replacement

Scheme 7

Scheme 7: Rearview Camera Image Display Module Replacement
Scheme 7: Rearview Camera Image Display Module Replacement
CalloutComponent Name
Preliminary Procedure Remove the rear side 60/40 door trim panel - right side. Refer to Rear Side 60/40 Door Trim Panel Replacement - Right Side (E24, 40 Door) , Rear Side 60/40 Door Trim Panel Replacement - Right Side (E24, 60 Door) .
1Rearview Camera Fastener (Qty: 2) CAUTION: Refer to Fastener Caution .
2Rearview Camera Image Display Module Procedure Disconnect electrical connector.
CAUTION
Refer to Fastener Caution .

Rearview Camera Image Display Module Replacement

Rear Vision Camera System Operation

The rear vision camera system consists of a video camera located at the rear of the vehicle and the radio.

When the transmission is placed into REVERSE, a 12 volt signal is sent to the rear vision camera by the body control module (BCM). This signal indicates to the camera that the vehicle is in reverse and image display is requested. The rear vision camera receives ignition voltage and a constant ground to power the camera. Video signal + and video signal - circuits carry the video image from the rear vision camera to the radio. Additionally, the video signal circuits are shielded to prevent any interference which may lead to a loss of video signal resolution and a degraded video image. The shield is provided a ground path by the rear vision camera.

The following conditions may cause a degraded rear vision camera image

  1. Ice, snow, or mud has built up on the rear vision camera
  2. Dark conditions
  3. Extreme light conditions, such as glare from the sun or the headlights of another vehicle
  4. Damage to the rear of the vehicle
  5. Extreme high temperatures or extreme temperature changes

If a malfunction is detected in the system, Service Rear Vision Camera may be displayed on the navigation radio as an indicator to the customer that a problem exists that requires service.

Object Detection Description and Operation (with rear park assist UD7)

The ultrasonic parking assist system is designed to identify and notify the driver of an object in the vehicles 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 rear speakers.

The parking assist system is made up of the following components

  1. Parking assist control module
  2. Rear object alarm sensors

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.

Rear Parking Assist Operation

When the vehicle is first placed into reverse there will be one audible beep through the rear speakers, to indicate that the system is working. If rear speakers are inoperable no audible signals will occur.

When backing up at speed of less than 8 km/h (5 MPH), the system is constantly monitoring for object of interest located behind the vehicle. 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. If an object is detected within 2.5 m (8 ft) there will be a audible beep notification out of both rear speakers based upon the distance to the object. As the vehicle gets closer to an object, the time between the beeps become shorter.

If the vehicle stops in a range zone the beeping will stop after 5 s. When the distance between the object and the vehicle changes, beeping will start again.

If the rear parking assist system detects a malfunction the single audible beep will not chime when put into reverse along with a DTC being stored. The object alarm module will send a serial data message to the instrument panel cluster to display the SERVICE PARK ASSIST message on the driver information center.

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 audio system personalization menu.
  2. The park brake is applied or not fully released.
  3. 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.
  4. The parking assist sensors are covered by snow, mud, dirt or ice.
  5. The vehicle bumper is damaged.
  6. Excessive paint thickness on a replacement parking assist sensor.
  7. The parking assist sensors are disrupted by vibrations, like those caused by a large nearby vehicle or from heavy equipment such as a jackhammer.