Parallel Parking Assist System Malfunction
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Parallel 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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Parallel Park Assist Switch Signal
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B096B 02
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1
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1
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Parallel Parking Assist Switch Ground
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1
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1. Parallel Parking Assist Switch Malfunction
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Circuit/System Description
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The parallel parking assist system is able to guide the driver into a parking lot by giving instructions. The system consists of the 8 parking assist sensors from the normal parking assist located in the front and rear bumper, and two additional parallel parking assist sensors on the side of the vehicle. The additional parallel parking assist sensors are used to measure the parking lot size. The parallel parking assist system uses the 8 parking assist sensors to identify objects in the vehicle's path when moving into the parking lot.
The parallel parking assist is activated/deactivated by pressing the parallel parking assist switch. The activated parallel parking assist searches for an appropriate parking lot. If a lot is detected, feedback is given to the driver through the indicator in the driver information center. The driver accepts the decision by stopping the vehicle. The system calculates the optimal path into the parking lot and guides the driver into the lot by giving instructions.
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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Vehicle 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 large a truck 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 (Traffic Sign Assist)
Object Detection Description and Operation (Parking Assist with Parallel Parking)
Object Detection Description and Operation (Parking Assist)
Object Detection Description and Operation (Lane Departure Warning)
Object Detection Description and Operation (UFT)
Object Detection Description and Operation (UVC)
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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Verify the correct function of the parking assist system.
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3.
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Ignition ON, observe the scan tool Advanced Park Assist Switch parameter while pressing and releasing the parallel 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 Circuit/System Testing.
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5.
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Observe the Body Control Module (BCM) Brake Switch parameter while pressing and releasing the brake pedal. The parameter should change between Active and Inactive.
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7.
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Transmission in REVERSE, verify the Engine Control Module (ECM) scan tool Reverse Switch parameter is Active.
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9.
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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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Press the parallel parking assist switch, verify the scan tool Park Assist System Status parameter is Enable.
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10.
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If not the specified value, refer to Diagnostic Aids to determine the cause of the inhibit.
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1.
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Ignition OFF, disconnect the X1 and X2 harness connectors at the K41 Parking Assist Control Module and 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 S48E Multifunction Switch - Center Console 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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Ignition ON, test for less than 0.3 V between the signal circuit terminal 6 X2 at the K41 Parking Assist Control Module harness connector and ground.
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5.
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If greater than the specified range, test the signal circuit for a short to voltage.
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6.
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Ignition OFF, connect the harness connector at the S48E Multifunction Switch - Center Console.
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7.
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Ignition ON, verify that a test lamp does not illuminate between the B+ circuit terminal 1 X1 at the K41 Parking Assist Control Module harness connector and signal circuit terminal 6 X2.
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8.
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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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9.
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Verify that the test lamp illuminates between the B+ circuit terminal 1 X1 at the K41 Parking Assist Control Module harness connector and signal circuit terminal 6 X2 while pressing the parallel parking assist switch.
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10.
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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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11.
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If all circuits test normal, replace the K41 Parking Assist Control Module.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
