DescriptionThe car may be fitted with an electronically-controlledsafety system that sets off the front seat belt pretensioners andthe driver's Air Bag, passenger Air Bag and Side Bags in the caseof frontal and/or side impact of a certain severity.In the case of a side impact of a certainmagnitude, the corresponding side Air Bag and Window Bags are activated(only on the side where the impact has taken place).An electronic control unit manages the entiresystem by controlling all the components and activating the restraintsystems (pretensioners and airbags) as necessary.The control unit is located under the centreconsole and is rigidly fixed to the bodyshell: in this way the decelerationsensors located inside it are close to the centre of gravity anddetect deceleration for the entire vehicle accurately.There is an accelerometric sensor on thetwo front door pillars which, in the case of a side impact, transmitsa signal to the control unit. This signal is also processed insidethe control unit which, as a result, decides on the operation ofthe Side Bag and Window Bag on the side where the impact has takenplace.The driver's Air Bag module is located inthe centre of the steering wheel; it is fitted on a tilting platewhich enables the horn to be operated. The plate houses a metalcontainer which holds the folded airbag and a gas generator that inflatesthe bag.A clock spring device allows the airbagmodule connection leads to turn with the steering wheel withoutthe risk of breakage.The passenger airbag is located on the facia,above the glove compartment, and is fastened directly to the carcrossmember via a special bracket.The passenger Air Bag can be deactivatedvia a special switch - which can be operated by the car key - locatedat the end of the dashboard, passenger side and is only accessiblewith the door open. With the key in the OFF position, the controlunit also controls the operation of the special 'passenger Air Bag disabled'warning light.The Side Bag is housed in the outer partof the front seat. The sensor is located in the centre pillar.The Window Bag consists of a curtain bagwhich inflates and places itself between the head of the occupantsand the side windows. The Window Bag folded bag is located underthe roof panel, whilst the rear pillar houses the gas generator.The pretensioner is a device built intothe front seat belt reel. For more details 3232972Characteristic of working principle5580Cair bag system . The system control unit supply line is protectedby a fuse in the additional fuse box.768
767carefully observe the safety regulationswhen working on the airbag system. For further details see [PR5580C].
767for versions without the VDC option,refer to the specific wiring diagram
Functional description The Air Bag system control unit M60 receivesa supply controlled by the ignition (INT) at pin 12 of connectorA from the line protected by fuse F5 of the additional fuse boxB98B. Pin 1 of connector A and pins 17 and 32of connector B are connected to a specific earth C50.When frontal impact of a certainseverity (depending on the software setting) is detected, the controlunit sends control signals to set off the modules:to driver's Air Bag Q9, through a clockspring D47 (frompins 23 and 24 of connector A):to passenger side air bag Q11 (from pins 21 and 22of connector A):to the front pretensioners on the driver's side Q20(from pins 1 and 2 of connector B) and the passenger side Q21 (frompins 3 and 4 of connector B). Pins 10 and 11 of connector A are connectedto the passenger Air Bag disabling switch H75. The side impact detection sensors K66(driver's side) and K67 (passenger side) send signals to pins 24-26and 25-27 respectively of connector B of the control unit M60.When side impact of a certain severity(dependent on the software setting) is detected, the control unitsends control signals to set off the modules:to the driver's side Air Bag Q30 (from pins 5 and 6of connector B);to the passenger side Air Bag Q31 (from pins 9 and10 of connector B);to the driver's Window Bag Q40 (from pins 7 and 8 ofconnector B);to the passenger Window Bag Q41 (from pins 11 and 12of connector B). The two side Air Bags are connected to earth C50 . When the system self-diagnostic functiondetects a fault or an impact is detected, control unit M60 sendsa signal - from pin 8 of connector A - to the Air Bag faulty warninglight located in the check instrument E30. This signal causesthe warning light to come on because the instrument E30 supplyis controlled by the ignition (INT) from the line protected by fuse 4of the additional fuse box B98B . Similarly, pin 7 of connector A of M60sends a signal for the 'passenger Air Bag disabled' warning lightlocated in the check panel E30. Self-diagnostic data can be read by connectingthe unit to connector R10: it receives signals from pin 6 ofconnector A of the control unit M60 through the relevant testerline.
0Removing201Refitting211. Unscrew the screw.2. Remove the frame (2a) and take it off the check clamps (2b).3. Unscrew the screws.4. Remove the speedometer/odometer (4a) from from support and moveit.5. Disconnect the electric connections (5a, 5b).2018847
5560B03
0Removing201Refitting211. Unscrew the screw.2. Remove the frame (2a) and take it off the check clamps (2b).3. Unscrew the screws.4. Extract the speedometer (4a) from the support (4b) e move it.5. Disconnect the electric connections (5a, 5b).2018848
5560B06
0Removing201Refitting21For the replacement of lampsof the speedometer/odometer proceed as follows.3238496-5560B02kilometre/mileometer - r r1. Turn and remove the lamp holder of the instrument lamp (1a) orthe lamp holder of the display lamp (1b).2. Remove the lamp from lamp holder. Pressure joint.2018849
0Removing201Refitting211. Disconnect the electrical connection.2. Release intermittence (2a) from retainer (2b), then from retainer(2c).3. Recover the intermittence. Take care not to damage the contactstrips (3a).2019579
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