Parking Assist System Malfunction
Parking Assist System Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Circuit/System Description
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.
Diagnostic Aids
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:
* Manual Disable - The parking assist system has been disabled through the system personalization menu. Refer to Owner's Manual for more information.
* 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).
* Reverse Overspeed - The vehicle is travelling too fast in reverse at speeds of greater than 8 km/h (5 mph).
* Inhibit - The parking assist control module has lost or received invalid GMLAN signal(s).
* 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.
* 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.
Reference Information
Schematic Reference
Object Detection Schematics [1][2]Collision Avoidance and Parking Assist Systems
Connector End View Reference
Component Connector End Views Outside Rearview Mirror - Driver
Description and Operation
Object Detection Description and Operation (with rearview camera UVC) Object Detection Description and Operation (with rearview camera UVC)Object Detection Description and Operation (with side blind spot alert UFT) Object Detection Description and Operation (with side blind spot alert UFT)Object Detection Description and Operation (with parking assist UD7) Object Detection Description and Operation (with parking assist UD7)
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Testing
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 Backup Lamps Malfunction.
• 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.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Control Module References Control Module References for module replacement, programming and setup