DescriptionThe VDC is an electronic system for controlling vehicle stability which intervenes on the drive torque and brakes the wheels in a differentiated manner, if there is a loss of grip, thus helping to return the car to its correct trajectory.The VDC system is activated automatically when the car is started and cannot be switched off, unlike the ASR/TCS system which can be disabled by pressing the specific button located on the central console.The basic components of the VDC system are:an electronic control unit (same as for the ABS) which processes the signals received from the various sensors and implements the most appropriate strategy;a sensor which detects the steering wheel position;four sensors which detect the speed of rotation of each wheel (shared with the ABS);a sensor which detects the vehicle's rotation around the vertical axis;a sensor which detects lateral acceleration (centrifugal force);a pump with pressure switch for maintaining the brake fluid under pressure.The system is protected by specific maxifuses, contained in the engine bay.When the ignition is turned on, the warning light on the instrument panel comes on and should go out after about 4 seconds.If the warning light flashes during driving, this means that the VDC system has intervened.
Functional description The direct supply from the battery arrives from two specific lines protected by the maxifuses B34 and B7 at pins 2 and 6 of the ABS control unit M50 . The ignition-operated supply arrives from the line protected by fuse B31 at pin 23 of the ABS control unit M50 . Pin 22 of M50 indicates the sate of the system to the instrument panel E50 at pin 18 of connector C which, via an internal processor, operates the warning light as follows:if the system intervenes, the warning light flashes;if there is a fault, the warning light stays on permanently. Pins 5 and 1 of M50 are earthed. Pin 15 of connector A of E50 receives an ignition-operated supply from the line protected by fuse F1 of junction unit B1 . The fuel pump N90 , which keeps the brake fluid under pressure, is connected to control unit M50 at pins 3 and 4. Pins 8, 9, 10, 21, 39 and 41 are connected to the slew sensor K74 , which informs the control unit M50 on the rotation of the vehicle around the vertical axis. The control unit M50 also receives signals, at pins 24 and 40, from the steering angle sensor K58 . Pins 25, 26 and 42 of M50 are connected to the pressure sensor K72 .
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213314824-5505A18multi-function controlunit - r r . 1. Undo the bolt (1a) and push back the junction unit as far asnecessary to disconnect the electrical connections (1b).767For precise identification ofthe electrical connections, see Wiring Diagrams Section.2. Remove the junction unit.2010592
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21 Make sure that the ignitionis off (STOP position), then disconnect the negative battery terminal(refer to op. 33148615530B10battery - r+r ). 1. Unscrew bolt (1a) and open fuse access cover (1b).2. Undo the bolt (2a) and remove the integrated multiservices unit(2b) after having disconnected the electrical connections (2c),(2d), (2e), (2f) and (2g).2010595
5505A29
<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) for theadditional junction unit.2071293
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213314864-5530B54battery cover - r+r . Make sure that the ignition key is in theOFF position.1. Disconnect the battery negative and positive terminals.2. Undo the bolt (2a) fixing the battery retaining bracket (2b).3. Remove the battery.2010647
5530B40
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213314864-5530B54battery cover - r+r1. Press and release the retainers (1a), then remove the cover (1b)for the supply box on the battery. 2071303
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Working in the luggage compartment, undo the knob for the batterycover.2. Remove the battery cover.2010650
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting213314917-5560B11analogue control panel- r+r or replace . 1. At the bench, remove the bulbs from the panel using suitablepliers.2010702
5560B11
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21 Make sure that the ignitionis off (STOP position), then disconnect the negative battery terminal(refer to op. 33148615530B10battery - r+r ). Lower the steering wheel and move it back.1. Undo the bolts (1a) and remove the upper half casing for thesteering column (1b).2010703
5560B12
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21 Make sure that the ignitionis off (STOP position), then disconnect the negative battery terminal(refer to op. 33148615530B10battery - r+r ). Open the fuse carrier compartment flap.1. Using the tool (1a) and pushing the fuse carrier compartment,remove the surround (1b) complete with switches.2. Disconnect the elelectrical connections (2a), (2b) and (2c) andremove the surround complete with switches.2010706
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21 Make sure that the ignitionis off (STOP position), then disconnect the negative battery terminal(refer to op. 33148615530B10battery - r+r ). 1. Remove the caps (1a) and undo the bolts (1b) fixing the thirdbrake light to the rear parcel shelf.2. Disconnect the electrical connection (2a) and remove the thirdbrake light (2b).2010698
5550D17
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21 Make sure that the ignitionis off (STOP position), then disconnect the negative battery terminal(refer to op. 33148615530B10battery - r+r ). 3314911-5550D16third stop light - r+r . 1. Undo the bolts (1a) and remove the bulb holder (1b).2010699
5550D18
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21 Make sure that the ignitionis off (STOP position), then disconnect the negative battery terminal(refer to op. 33148615530B10battery - r+r ). 3315223-7040L20tunnel trim - r r1. Undo the nut (1a) and disconnect the earth lead (1b).2. Disconnect the electrical connection from the handbrake warninglight switch.3. Undo the nut (3a) and remove the handbrake warning light switch(3b).2010701
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Position the vehicle on theramp. Make sure that the ignition is off (STOPposition), then disconnect the negative battery terminal (referto op. 33148615530B10battery - r+r ). 3315196-7040D12engine front side cover (one) lh or rh - r r (left). 3315197-7040D14engine bay rear side cover (one) lh or rh - r r (left). Remove the cap with built-in brake fluidlevel switch and drain the brake/clutch fluid from the reservoir usinga suitable syringe.1. Disconnect the comb from the A.B.S. hydraulic and electroniccontrol unit.2. Release the A.B.S. pipes from their clip.3. Disconnect the pipes from the A.B.S. hydraulic and electroniccontrol unit and move them aside.2009904
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Position the vehicle on thelift. Make sure that the ignition is off (STOPposition), then disconnect the negative battery terminal (referto op. 33148615530B10battery - r+r ). 3315196-7040D12engine front side cover (one) lh or rh - r r (right) 3315197-7040D14engine bay rear side cover (one) lh or rh - r r (right) 1. Release the front right wheel speed sensor wiring from its clamp.2. Disconnect the electrical connection for the front right wheelspeed sensor.3. Release the rubber cable pass for the front right wheel speedsensor wiring from the bodywork.2009919
3340A35
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Position the vehicle on thelift.3314864-5530B54battery cover - r+r . 3314861-5530B10battery - r+r . 3314863-5530B52Battery DRIP TRAY/SUPPORT - R.R. . 1. Disconnect the electrical connection (1a) for the rear rightwheel speed sensor and release the wiring from the clip (1b).2. Release the rubber cable pass from the rear left wheel speedsensor from the bodywork.2009921
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