Parking Assist System Malfunction
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Parking Assist System Malfunction
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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Parking Assist Switch Indicator Ignition
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B0968 06
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B0968 06
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-
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-
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Parking Assist Switch Signal
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B0967 02
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1
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-
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-
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Parking Assist Switch Indicator Control
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B0968 06
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B0968 06
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B0968 01
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-
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Parking Assist Switch Ground
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-
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1
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-
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-
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1. Parking Assist Switch Malfunction
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Circuit/System Description
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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 owner's manual" or "Park assist blocked, see owner's manual" message is displayed in the driver information center. 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:
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Manual Disable - The parking assist system has been disabled through the parking assist switch or audio system personalization menu.
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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).
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Reverse Overspeed - The vehicle is travelling too fast in reverse at speeds of greater than 8 km/h (5 MPH).
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Inhibit - The parking assist control module has lost or received invalid GMLAN signal(s).
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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.
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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:
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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.
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Silicone insulator surrounding sensor maybe missing, cut, or twisted.
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Improperly installed sensor, sensor maybe be crooked due to a tight wire harness.
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One or more of the sensors may be scratched or the paint maybe chipped.
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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.
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Schematic Reference
Object Detection Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Object Detection Description and Operation (UVC)
Object Detection Description and Operation (UD5)
Electrical Information Reference
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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1.
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Ignition ON, verify the park assist system is enabled through the parking assist switch or audio system personalization menu.
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2.
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If the park assist system is manually disabled, enable the system. Refer to the vehicle owners manual for instructions on enabling the system.
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3.
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Observe the scan tool Park Assist Switch parameter while pressing and releasing the parking assist switch. The parameter should change between Active and Inactive.
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4.
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If the parameter does not change between the specified values, refer to Parking Assist Switch Circuit Malfunction.
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5.
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Command the Park Assist Switch LED ON and OFF with the scan tool. The parking assist switch indicator should turn ON and OFF when changing between the commanded states.
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6.
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If the indicator does not turn ON and OFF, refer to Parking Assist Switch Indicator Circuit Malfunction.
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7.
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Note
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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).
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Transmission in Reverse, verify the scan tool Park Assist System Status parameter is Enable.
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8.
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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.
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Parking Assist Switch Circuit Malfunction
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1.
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Ignition OFF, disconnect the harness connector at the S48E Multifunction Switch - Center Console.
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2.
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Test for less than 10 Ω between the ground circuit terminal 2 and ground.
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3.
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If greater than the specified range, test the ground circuit for an open/high resistance.
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4.
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Connect the harness connector at the S48E Multifunction Switch - Center Console.
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5.
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Disconnect the X1 harness connector at the K41 Front and Rear Parking Assist Control Module.
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6.
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Ignition ON, test for less than 0.3 V between the signal circuit terminal 8 X1 and ground.
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7.
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If greater than the specified value, test the signal circuit for a short to voltage.
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8.
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Ignition ON, verify that a test lamp does not illuminate between the B+ circuit terminal 1 X1 and signal circuit terminal 8 X1.
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9.
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If the test lamp illuminates, test signal circuit for a short to ground. If the circuit tests normal, replace the S48E Multifunction Switch - Center Console.
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10.
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Verify that the test lamp illuminates between the B+ circuit terminal 1 X1 and signal circuit terminal 8 X1 while pressing the parking assist switch.
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11.
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If the test lamp does not illuminate, test the signal circuit for an open/high resistance. If all circuits test normal, replace the S48E Multifunction Switch - Center Console.
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12.
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If all circuits test normal, replace the K41 Front and Rear Parking Assist Control Module.
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Parking Assist Switch Indicator Circuit Malfunction
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1.
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Ignition OFF, disconnect the harness connector at the S48E Multifunction Switch - Center Console.
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2.
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Ignition ON, test for B+ between the ignition circuit terminal 3 and ground.
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3.
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If less than the specified value, test the ignition circuit for a short to ground or an open/high resistance.
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4.
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Command the Park Assist Switch LED output control ON with the scan tool. Test for B+ between the ignition circuit terminal 3 and the signal circuit terminal 6.
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5.
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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.
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6.
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Command the Park Assist Switch LED output control OFF with the scan tool. Test for less than 0.3 V between the ignition circuit terminal 3 and the signal circuit terminal 6.
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7.
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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.
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8.
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If all circuits test normal, replace the S48E Multifunction Switch - Center Console.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
