DescriptionThe electronic anti-lock brake system (BOSCH 5.7 ABS with ASR) governs braking pressure sent to the wheels and prevents loss of grip under all tyre and road surface conditions.This is combined with a VDC (VEHICLE DYNAMIC CONTROL) system, which controls vehicle stability by modulating drive torque and braking the wheels differentially, if there is a loss of grip, thus helping to return the car to its correct trajectory.The VDC system acts on the engine and brakes to generate a stabilising torque when the ABS sensors detect conditions that could lead to the vehicle slipping.The VDC system includes the following specific components over and above those of the ABS:a sensor which detects the steering wheel position (steering sensor);a sensor which detects the vehicle's rotation around the vertical axis and side acceleration (centrifugal force) (yaw sensor);a sensor that detects pressure on the hydraulic ABS unit (pressure sensor)By processing information from the sensors, the control unit is able to find out car position moment by moment and compare the position with the driver's ideal trajectory. If the values do not tally, within a fraction of a second the control unit chooses and implements more effective actions to restore the vehicle to its trajectory immediately: it applies a braking force of different intensity to one or more wheels and reduces power transmitted by the engine if necessary.The VDC comes on automatically when the vehicle is started up and cannot be switched off.A warning light on the control panel flashes when the system cuts in to notify the driver that the VDC system has come on.VDC systems are always connected to ASR systems.The ASR system increases vehicle stability and active safety by controlling drive wheel slip. If slip is caused by excessive power transmission, it cuts in to reduce engine power through communication with the engine management control unit. if slip is detected at a single wheel, the system cuts in to brake the slipping wheel by acting on the modulation solenoid.ASR comes on automatically whenever the engine is started. The system can be deactivated by operating a button on the central console.When the system is off, a led on the button comes on at the same time as a warning light on the control panel.The ASR/VDC warning light flashes to notifiy the driver that the ASR system has cut in due to road surface grip conditions.When the control unit detects an error in the ASR function or the VDC function, it lights up the warning light constantly. As far as the ABS function is concerned, 3309988SeeE7020ABS . For further details see 3308517Characteristic of working principle3340A(B.S. ANTI-LOCK BRAKING SYSTEM .)The supply lines to the control unit and the various system components (sensors and actuators) are protected by a specific maxifuse and by a fuse in the additional fuse box.The supply lines for the control unit and the various system components (sensors and actuators) are protected by two dedicated fuses located in the engine compartment control unit.
Functional description The ABS electronic control unit M50 is supplied (at pin 2 and 6) directly by the battery via a line protected by fuses F2 and F4 housed in the engine compartment junction unit B1. The supply controlled by the ignition (15/54) reaches pin 23 from the line protected by fuse F9 of junction unit B2.The control unit is earthed via pins 1 and 5. The ABS control unit M50 is connected through a CAN line from pins 24 and 40 to the engine management control unit M10 allowing the exchange of information between the two control units. This CAN line also connects the steering sensor K58 and the slewing sensor K74 from pins 21 and 39 of M50. 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. Pins 25, 26 and 42 of M50 are connected to the pressure sensor K72 . The four sensors K70, K71, K75, K76 send wheel speed signals to pins 28-12, 15-16, 13-14 and 30-31 of M50 respectively. The control unit M50 also controls the ASR functions: it is connected from pin 27 to the special on/off button located in the control panel on the tunnel H36 (pin 14). When the ASR function is deactivated, the control unit turns on the LED next to the button from pin 18 - pin 5 of H36. Both the button and LED for H36 receive an ignition-controlled supply (15/54) from the line protected by fuse F5 of junction unit B2. The switch I30 N.A. contact is supplied when the ignition is turned on (15/54) from fuse line F1 of junction unit B2:when the brake pedal is pressed, the switch closes and sends the enablement signal to pin 32 of control unit M50. The ABS is deactivated entirely unless the brake pedal is pressed. The same signal for the brake pedal I30 is also used for operating the brake lights SeeE2021 BRAKE LIGHTS . 767 the second contact for the brake pedal I30, N.C. contact, receives an ignition-controlled supply (15/54) from the line protected by fuse F9 of the junction unit B2; when the brake pedal is released, the switch sends a signal to pin 20 of control unit M50. Pin 37 of M50 produces a speedometer signal (average speed of all four wheels) which is directed to instrument panel E50 - pin 2 of connector B SeeE4010 INSTRUMENT PANEL . The ABS includes a self-diagnostic system: when the control unit detects problems with the ABS function, it sends a signal from pin 38 of M50 to instrument E50 - pin 19 of connector C - which turns on the ABS fault warning light.If the problems involve the EBD function, the control unit also sends a signal on the same serial line to the 'insufficient brake fluid level' and 'handbrake applied' warning light.pin 22 of M50 E50 if the ASR system intervenes the warning light flashes; if there is a failure, the warning light remains on constantly. The autodiagnostic data can be read by connecting to connector R10 - pin 1: it receives signals from pin 11 of the control unit M50 via the special diagnostic line SeeE8010 DIAGNOSTIC MULTIPLE CONNECTOR .
<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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