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| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Parking Assist Switch Indicator Ignition | B0968 06 | B0968 06 | -- | -- |
Parking Assist Switch Signal | B0967 02 | 1 | -- | -- |
Parking Assist Switch Indicator Control | B0968 06 | B0968 06 | B0968 01 | - |
Parking Assist Switch Ground | -- | 1 | -- | -- |
1. Parking Assist Switch Malfunction | ||||
The ultrasonic parking assist system is designed to identify and notify the driver of an object in the vehicle's path when moving forward or reversing at speeds of less than 8 km/h (5 MPH). The distance and location of the object is determined by eight object sensors: four located in the rear bumper and four located in the front bumper. The parking assist system will notify the driver using an audible signal through the radio.
When the "Park Assist Off", "Park Assist Blocked See Owners Manual", or "Park Assist Blocked See Owners Manual" message is displayed in the Driver Information Centre the disable reason is stored in the Park Assist Disable History.
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:
| • | Manual Disable - The parking assist system has been disabled through the parking assist switch or audio system personalization menu. |
| • | 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). |
| • | 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. |
Object Detection Description and Operation : UVC → UD5
Control Module References for scan tool information
| ⇒ | If the park assist system is manually disabled, enable the system. Refer to the vehicle owners manual for instructions on enabling the system. |
| ⇒ | If the parameter does not change between the specified values, refer to Parking Assist Switch Circuit Malfunction. |
| ⇒ | If the indicator does not turn ON and OFF, refer to Parking Assist Switch Indicator Circuit Malfunction. |
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 values, refer to Diagnostic Aids and the scan tool Park Assist Disable History parameters to determine the cause of the inhibit. |
| ⇒ | If greater than the specified value, test the ground circuit for an open/high resistance. |
| ⇒ | If greater than the specified value, test the signal circuit for a short to voltage. |
| ⇒ | If the test lamp illuminates, test signal circuit for a short to ground. If the circuit tests normal, replace the S48B Multifunction Switch - Overhead Console. |
| ⇒ | If the test lamp does not illuminate, test the signal circuit for an open/high resistance. If all circuits test normal, replace the S48B Multifunction Switch - Overhead Console. |
| ⇒ | If less than the specified value, test the ignition circuit for a short to ground or an open/high resistance. |
| ⇒ | If less than the specified value, test the signal circuit for an open/high resistance. If all circuits test normal, replace the K41 Front and Rear Parking Assist Control Module. |
| ⇒ | If greater than the specified value, test the signal circuit for a short to ground. If all circuits test normal, replace the K41 Front and Rear Parking Assist Control Module. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for parking assist control module replacement, programming and set-up |
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