Parking assistance (2004)

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Fig 1: Identifying Parking Assistance Input And Output Signals

Courtesy of VOLVO CARS OF NORTH AMERICA.

The back-up (reverse) warning system is activated by pressing the switch on the climate control module (CCM) (3/112). Information about the position of the switch is sent via the Control area network (CAN) to the rear electronic module (REM) (4/58). When back-up (reverse) warning is selected, this is confirmed by the rear electronic module (REM) sending a signal back to the climate control module (CCM) to light the LED in the switch.

The rear electronic module (REM) also receives information via the Control area network (CAN) from the central electronic module (CEM) (4/56) about:

the key position and
that back-up (reverse) gear is selected.

The parking assistance system can detect nearby objects when the ignition is on in position II and back-up gear (R) is selected. The parking assistance system is deactivated automatically when the gear selector lever is moved from (R) to any other position.

When the conditions for activating the back-up (reverse) warning are met, the rear electronic module (REM) sends data via serial communication to the parking assistance module (PAM) (4/86). The parking assistance module (PAM) receives signals from the back-up (reversing) warning sensors. The signal is transmitted to the audio module (AUM) (16/1). The parking assistance module (PAM) sends the signal when there is an object within 1.5 meters of the rear of the car.

The Audio Module (AUM) displays a text message that the back-up (reversing) warning is active. The Infotainment Control Module (ICM) also sends information via the MOST network to the Audio Control Module (AUD) (16/105). The information which is sent contains the time interval between the acoustic tones as well as the muting of other sound, e. g. CD or radio. The Audio Module (AUM) plays back the sound in the front loudspeakers.

The sound comes from both left-hand front (16/4) and right-hand front loudspeakers (16/3).

The acoustic signal will have closer intervals with reduced distance to the object. At a distance of approx. 30 cm and less the signal has a continuous tone.

In the event of a fault in the parking assistance module (PAM) or in the sensors, a signal is transmitted from the rear electronic module (REM) via the Control area network (CAN) to the driver information module (DIM) (5/1). The driver information module (DIM) then lights the general warning lamp and displays a text message.