Collision Avoidance and Parking Assist Systems: Description and Operation

91 ParkAssist (option)

The 911 Carrera/S (997) uses the smallest parking sensors on the market. They are inserted from the back into a bracket attached to the rear bumper cover and clipped into place. This further improves the appearance of the rear cover.

ParkAssist acts as a safety function for the rear of the vehicle only. Four ultrasonic sensors in the rear bumper monitor the area behind the vehicle for obstacles. The system emits acoustic warnings via a tone generator in the instrument cluster and cannot be deactivated. ParkAssist is activated when the ignition is on and reverse gear is engaged. A brief signal tone is sounded for 0.5 s (1200 Hz) upon activation.

When the vehicle approaches an obstacle, an intermittent tone (1 kHz) is emitted from a distance of approx. 150 cm. The pulse and interval of this tone become increasingly shorter as the distance to the obstacle decreases, until the stop warning is sounded in the form of a continuous tone (1 kHz) of unlimited duration at a distance of approx. 30 cm.

In the event of an error, a continuous tone sounds at 60 Hz for 3 sec. The system can be diagnosed via the K-line and is not CAN-capable.