DescriptionThe car may be fitted with an electronically-controlled safety system that sets off the front seat belt pretensioners and the driver's air bag, passenger air bag and sidebags in the case of frontal and/or side impact of a certain severity.An electronic control unit manages the entire system by controlling all the components and activating the restraint systems (pretensioners and airbags) as necessary.The control unit has two different intervention levels:at the first level only the pretensioners are activatedthe second level the system operates both airbags and pretensioners.The control unit is located under the centre console of the vehicle and is fixed securely to the bodyshell. in this way, the deceleration sensors located inside the unit are close to the centre of gravity and measure whole car deceleration accurately.The driver's Air Bag module is located at the centre of the steering wheel; it is fitted on a tilting plate which enables the horn to be operated. The plate houses a metal container which holds the folded air bag and a gas generator that inflates the bag. A clock spring device allows the air bag module connection leads to turn with the steering wheel without the risk of breakage. The passenger Air Bag module is located in the dashboard, above the glove compartment and is fixed directly to the vehicle crossmember by means of a special bracket.The passenger Air Bag can be deactivated manually by means of a specific switch.The switch, which is ignition-activated, is located at the end of the facia on the passenger side and is accessible only with the door open. When the key is turned to OFF, the control unit also controls the activation of a passenger air bag disablement warning light on the instrument panel.The pretensioner is a device built into the front seat belt reel.They intervene, in the case of an impact of a certain magnitude, to recover the inevitable extension of the belts due to the action of the body weight, keeping the body close to the seat backrest.The control unit is self-diagnostic:it detects and memorizes any faultsit recognizes the various components and the type of faultit signals the onset of these faults via the special warning light.System activations following a particularly serious impact are memorized by the control unit.For further details, see DESCRIPTION AND OPERATION 5580E.The system control unit supply line is protected by a fuse located in the junction unit.768
767carefully observe the safety regulations when working on the airbag system. For further details see PROCEDURES 5580C'
Functional description The airbag system control unit M60 is supplied with power when the ignition switch is turned on (INT/A) at pin 5 by a line protected by fuse F2 in junction unit B1 . Pin 14 is connected to the specific earth C50 . When an impact of a set severity (determined by the control software) is detected, the control unit sends control signals to set off the modules:to driver's Air Bag Q9 , via the steering wheel clockspring Q10 (from pins 1 and 2):to passenger airbag Q11 (from pins 3 and 4);to pretensioners - left-hand Q20 (from pins 10 and 11) and right-hand Q21 (from pins 6 and 7). Pins 5 and 24 are connected to the passenger Air Bag disabling switch H75 . When the system self-diagnostic function detects a fault or an impact is detected, control unit M60 sends a signal -from pin 13 to pin 9 connector C of instrument panel E50. - to the airbag anomaly warning light. Pin 20 of M60 sends a signal to the passenger airbag disablement warning light at pin 16, connector C of instrument panel E50. These are earth signals and make the warning lights come on because the instrument panel E50 supply is controlled by the ignition (INT/A) from the line protected by fuse F1 of the junction unit B1.The red warning light is a 'smart' light; in other words, an inner control circuit causes the warning light to light up even if the connection is broken or if the circuit connecting warning light and control unit is short-circuited to earth. Pin 9 of control unit M60 is connected to pin 3 of multiple diagnosis connector R10.
0Removing201Refitting213314824-5505A18multi-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
0Removing201Refitting21 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
0Removing201Refitting21Open the bonnet lid.1. Release the retainers (1a) and remove the cover (1b) for theadditional junction unit.2071293
0Removing201Refitting213314864-5530B54battery 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
0Removing201Refitting213314864-5530B54battery cover - r+r1. Press and release the retainers (1a), then remove the cover (1b)for the supply box on the battery. 2071303
0Removing201Refitting21 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
0Removing201Refitting21 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
0Removing201Refitting21 Make sure that the ignitionis off (STOP position), then disconnect the negative battery terminal(refer to op. 33148615530B10battery - r+r ). 3315182-7040A45facia rh side cover - r r . 1. Remove the switch for deactivating the passenger Air Bag (1a)using the tool (1b) after having disconnected the electrical connection(1c).2010723
0Removing201Refitting21- 7045A10 l/h or r/h front seat (one) - r+r - 7045A98 front seat rear pouch panel, lh or rh - r r 3315250-7045B10l/h or r/h front seat head restraint - r+r- 7045A84 Front set BACKREST COVER - R.R. with seat removed - 7045A88 Front seat BACKREST UPHOLSTERY, left or right - R.R.with seat removed 7691. Disconnect the electrical connection for the sidebag. Take careto remove without damaging it. 2. Undo bolt (2a) and disconnect the sidebag earth cable (2b) 3. Cut the collars securing the wiring to the chassis.4. Release the sidebag module and wiring from the protective casing.5. Remove the wiring by withdrawing from its seat.2010731
WARNING: before removingand refitting pretensioners the following operations must be carriedout:Turn the key to STOP and remove.Disconnect the battery leads and insulate.Wait for 10 minutes before continuing.OBSERVE ALL SPECIFIED SAFETY RULES (see 7065A - Precautions)
7065A14
0Removing201Refitting21- 7045A10 l/h or r/h front seat(one) - r+r 1. Remove the protective cap.2. Unscrew bolt (2a) retaining the link to the seat.Cut the collars retaining the seat beltunfastened warning light wiring.Carry out this operation only on thedriver's seat.3. Remove the seat belt anchorage link.2011108
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