2012 911 Section 9-1 11/3/11 10:30 AM Page 246
911 Carrera 911 Carrera S
Electrics and electronics
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9.8 ParkAssist The 911 Carrera (991) is equipped as standard with a ParkAssist system with 4 ultrasonic sensors at the rear. This system is also optionally available with Topview display (4 sensors at front and 4 at rear) (see Figs. 9_66_11 and 9_67_11). The ultrasonic sensors in the bumpers are used to calculate the distance between an obstacle and the vehicle bumper. This is then indicated to the driver both audibly and visually. The audible indication signals are different for obstacles at the front/rear. The system performance is designed so that the system does not just permit parking between two vehicles, but also guarantees reliable detection of obstacles with a small reflection area.
dynamic obstacles that could lead to vehicle damage at the front and/or rear. Warnings are provided by visual displays and acoustic warnings via the speaker in 9_65_11
the instrument cluster.
! The ultrasonic sensors are powered with a voltage of 12 V. For diagnostic purposes, a piece of foam can be stuck over individual parking sensors. This makes them "blind" and therefore allows isolation of possible sensor faults.
The visual warning is provided by a graphic display (Topview display [see Figs. 9_66_11 and 9_67_11]) on the PCM or CDR and is active after "Ignition on".
9_66_11
The operating range is from 0 mph (0km/h) up to a speed of approximately 9 mph (15 km/h). The tones for the audible warning have a lower pitch at the rear than at the front. The intervals decrease to a continuous tone as the vehicle comes closer to an obstacle. The audible warning at the front starts from 39˝ (100 cm) and at the rear from 47˝ (120 cm). A one-off initial warning tone is issued when an obstacle is detected at a distance of 71˝ (180 cm). 9_67_11
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The basic requirement for the “ParkAssist” system is that it must detect static and
