DescriptionThe parking assistance system provides the driver with information whilst reversing relating to distance when approaching obstacles which are behind the vehicle, which could be outside the driver's field of view.The information that there is an obstacle and its distance is transmitted to the driver by means of acoustic signals whose frequency varies according to the distance of the vehicle from the obstacle.An electronic control unit activates and controls the operation of the sensors located in the rear bumper, processing the signals received and activating the acoustic signal inside the instrument panel. The system is activated when reverse gear is engaged: under these conditions the control unit energizes the transducers and sends them a request signal, receiving response signals.The sensors use ultrasound technology and act as intelligent transmitters/receivers with triangulation technique: this allows improved detection in critical situations or where small obstacles are present. The impulses emitted are reflected by any obstacles; the transducers therefore receives an echo which is converted into a digital signal and sent to the electronic control unit.The distance of the obstacle is signalled by sounds with intermittent impulses: the frequency of this signal increases gradually as the bumper approaches an obstacle: when the distance calculated is less than 30 cm, the sound becomes high pitched and constant; the acoustic signal, on the other hand, ceases when the distance of the obstacle increases. For more details and information on the operation of the system, 2398715Characteristic of working principle5580Hparking obstacle detection deviceThe control unit has an autodiagnostic function: when it is switched on the control unit carries out an initial test on the sensors.which are then continuously diagnosed during the operation of the system.A fault with only one sensor inhibits the operation of the entire system: in this case, the system excludes itself and sends a fault message, the failure status is signalled to the instrument panel lighting up the dedicated warning light and sending a suitable acoustic warning. The signal that the reversing light has been switched on 2399188SeeE2022REVERSING LIGHTS is managed by the Body Computer which forwards this information to the parking sensor control unit via the CAN network. Rear obstacles are not signalled if there is a trailer 2399200SeeE2050TRAILER WIRING . The system is supplied via a circuit protected by a specific fuse in the underfacia control unit.
Functional description Parking sensor control unit M84 is supplied - pin 1 of connector A - from the INT line protected by fuse F49 of control unit B2. Pin 8 of connector A is earthed. The control unit is connected via CAN line to all other nodes on the network via pins 7 and 14 of connector A; in this way it receives the reverse engaged signal, amongst other signals.The commands for activating the buzzer are sent to the instrument panel via the CAN. Pin 5 receives an inhibition signal for the operation of the system if a trailer is connected via coupling D73 SeeE2050 TRAILER WIRING . The four parking sensors K97 are connected to connector C of control unit M84 : pin 1 supplies a reference earth, pin 6 the power supply, pins 5, 3, 2 and 4 are connected to sensors K97A , K97B , K97C and K97D .
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Open the bonnet lid.1. Release the retainers (1a) and remove the cover (1b).2050746
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting212400802-7040A37fuse box cover - r r1. Disconnect the electrical connections (1a, 1b, 1c, 1d, 1e, 1f).2. Undo the bracket retaining bolt.3. Slightly move the bracket (3a) for the dashboard trim and undothe bolt (3b).4. Undo the other bolts securing the body computer/junction unit.5. Slightly move the body computer/junction unit assembly.6. Disconnect the electrical connections (6a, 6b, 6c).7. Recover the body computer/junction unit.2050752
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Disconnect electronic control unit electrical connections (1a),(1b), (1c).2. Undo the bolts.3. Recover the control unit.2050753
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Disconnect electronic control unit electrical connections (1a),(1b), (1c).2. Undo the bolts.3. Recover the control unit.2050754
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Position the vehicle on a liftand raise it.1. Undo the rear bumper lower bolts.2. Slightly lower the bottom edge (2a) of the bumper and disconnectthe parking sensor electrical connection (2b). 2050878
5580H10
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Open the tailgate.1. Working on the left wing of the luggage compartment, disengagethe retainer (1a), then the retainers (1b) and remove the flap (1c). 2. Undo the bolt.3. Disconnect the electrical connections.4. Remove the control unit.2050880
5580H36
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Position the vehicle on a liftand raise it.1. Undo the rear bumper lower bolts.2. Slightly lower the bottom edge (2a) of the bumper and disconnectthe parking sensor electrical connection (2b). 3. Remove the parking sensor (3a) concerned, releasing it from theretainers (3b).2050881
