ELECTRICAL EQUIPMENT

Description 5505

General specifications

The technology used for the electrical equipment on this model is based on the complex structure known as "Family 1" used for the first time on a FIAT model.

The "Family 1" structure takes the following regional topological approach to improve the system: each control unit (electronic or electromechanical) is located in a centre of gravity position in relation to the functions managed.

This allows the power and signal distribution system to be minimised. This is also made possible through extensive use of serial communication networks that allow us to overcome problems of space-saving, reliability, weight and cost.

The structure consists of two CAN communication networks which connect nodes belonging to two different areas (vehicle dynamic control) and on board information/bodywork functions and a complementary serial line (LIN bus).

The architecture developed is compatible with various user interface solutions (control arrangement, information allocation and display method).

The electrical protection (fuses) and the relays are grouped together in the power distribution junction units located in the engine compartment and the dashboard. These junction units also act as connections for the various wiring and electrical distribution.

To produce a minimum number of wiring families, each circuit has a section coupling that should maintain the same position inside the coupling, irrespective of the trim level; the position and the type of the coupling on the vehicle should also not depend on the trim level.

To safeguard the modular nature of the wiring the inlets/outlets for each junction unit should not differ according to the trim level/engine type, the position of the connector or the cable/terminal/connector interface.

Fuse and relay holder unit

There are various types of power distribution units on this model produced using 3 different types of technology:

- Power PCB;

- Sheared circuit;

- Wiring with sheared circuit.

More specifically, there is:

- Body Computer Node Junction Unit (M001), produced with Power PCB

- Engine Compartment Junction Unit (B001), produced with sheared circuit

- Fuse Junction Unit on positive battery pole (B099), produced with sheared circuit

- Optional Fuse Junction Unit on positive battery pole (B098), produced with sheared circuit

- Luggage Compartment Junction Unit (B045), with sheared circuit wiring

Electronic compnents

The "Family 1" structure is composed of the elements listed in the table below:

User control modules

The "Family 1" structure integrates user controls in the switch carrier modules.

The list of modules is in the table together with the rest of the controls.

Network architecture

The structure comprises two CAN communication networks connected by a gateway for transferring shared information:

- BCAN (low speed: 50Kbit) for managing standard bodywork/infotelematic functions

- CCAN (high speed: 500 Kbit) for the dynamic control of the vehicle

The gateway for communication between the CCAN and BCAN is located in the Body Computer.

There is also an LIN communication serial line between the Body computer control unit and the control unit on the rain sensor: in this case the Body computer node has a gateway function between the LIN serial line and the CANs.

Ccan

Bcan

For the first time on a Fiat model the fault diagnosis of the nodes is carried out using a protocol on the CAN (ISO 14229).

Diagnostic structure

The position of the diagnostic structure, for both control units that are integrated in the CAN (nodes) and for those that do not have a CAN interface, is summarized in the table below:

Some control units and nodes are designated as "not having fault diagnosis" even though they have an autodiagnostic function (e.g. Rain Sensor Control Unit) which is because they do not have a diagnostic protocol and any errors are detected through the fault diagnosis of other control units (e.g. Body Computer).

Diagnostic connector

On this vehicle the 16-way diagnostic socket is not integrated in the Body Computer but is located to the left of the dashboard, in front of the actual Body Computer.

The diagnostic equipment (Examiner or other instruments) is connected to it by means of a special adaptor known as "MPX 97". This adaptor allows the system to which the autodiagnostic equipment is being connected to be selected.

Diagnostic socket connections

Wiring specifications

The wiring specifications and design features are:

- The use of unipolar cables that conform to all thermal and mechanical use grades (including the special conductors vital in critical application areas).

- Terminals with high yield resistance.

- The creation of multiple couplings using short circuiting connectors (joint connectors) or ultrasound welding protected by a thermal shrinkage tube.

- Earths produced by sealed type components (joint connectors) for engine compartment earths, open for those in the passenger compartment; eyelets to be attached for individual earths; eyelets for welding technology.

- The use of screened or twisted cables for particular functions.

- Complete protection of the wiring through corrugated tubes, plating, foam, polyvinyl chloride tubes, covers, ducts, etc.

- The complete use of secondary locks on connectors.

- Connection safety through the use of low load connectors, audible catches, inertia lock.

- Fastening of shunt connectors so that the connections are never the source of noise or interference.

- All connectors are clearly numbered on the cable introduction side to facilitate the identification of the position of the conductors.

- There are either "PUR" or pressed seals with a siphon at junctions with panels to prevent the cable loom from fraying or deteriorating.

- With the use of these seals the cables can be positioned in such a way that they do not slip out or lose their seal in relation to the panel.

- Thermal grades: all the wiring components have been selected taking the maximum operating temperatures into consideration.

- There are corrugated tubes and accessories on the wiring where the cable loom needs protection against thermomechanical and chemical factors.

MAIN NETWORK NODES

Engine compartment junction unit

The engine compartment junction unit is a junction unit with sheared circuits installed in a sealed container located in the engine compartment in the area of the left light cluster that houses the fuses and relays and performs the function of protecting the electrical loads.

Location of relays and fuses

On the more complete version the engine compartment control unit protect the electrical system via the following fuses:

(*) 20A, 30A or 40 A, depending on the version

(**) 30A, 40A or 60 A, depending on the version

The following relays are housed in the engine compartment control unit:

Engine compartment junction unit internal wiring diagram

Connections rear view

- B01A 36 pin connector, engine services cable

- B01B 42 pin connector, rear cable

- B01C 28 pin connector, crossmember cable

- B01X 1 pin connector power supply (on front section)

Junction unit on battery

It connects the battery terminal to the starter motor lead, to the engine compartment junction unit and to the first level power fuses that protection the luggage compartment junction unit power supply, the electric steering, the heater plugs control unit (JTD versions) or the robotized gearbox pump (versions with robotized gearbox).

1 - Positive battery terminal

2 - Connecting cable to starter motor

3 - Connecting cable to engine compartment junction unit

4 - Fuse F3

5 - Fuse F6

6 - Fuse F7

Optional fuses junction unit

There are two additional fuses, located next to the junction unit on the battery, for versions which have an additional heater (JTD only): F74 (30A) and F76 (50A).

Luggage compartment junction unit

The rear junction unit is located in the luggage compartment, on the left rear side panel.

Location of relays and fuses

On the more complete version the luggage compartment junction unit protects the electrical system via the following fuses:

The following relays are housed in the luggage compartment control unit:

Luggage compartment junction unit internal wiring diagram

Connections rear view

-B45A 1 pin connector power supply

- B45B connections inserted directly in the rear wiring (the numbers of the pins are stamped on the actual junction unit)

Body computer node

The Body Computer Node is an electrical/electronic component that carries out both the function of distributing the electric power (power PCB) and the function of managing the vehicle serial networks and functions of the "Family 1" structure (interior/exterior lighting, immobilizer, fault diagnosis, wiper, heated rear windscreen, door and boot locking/unlocking, fuel level, management and acquisition of key status) and houses the gateway between the BCAN and CCAN and between the LIN and BCAN.

The interfaces for the remote control and immobilizer RF aerials are at the Body Computer.

Connections front/rear view

- M01A 60 pin connector, rear cable

- M01C 20 pin connector, rear cable

- M01D 60 pin connector, dashboard cable

- M01E 32 pin connector, rear cable

- M01G 1 pin connector, rear cable power supply

- M01H 20 pin connector, dashboard cable

- M01K 1 pin connector, rear cable

There is a PCB inside the Body Computer, next to the electronic section, that performs the function of distributing the electrical power (PCB power); this function is carried out by means of micro relays incorporated in the actual PCB (which therefore cannot be replaced); there are fuses on the output lines for the various consumers located on the outside of the Body Computer casing as illustrated in the diagram.

The following fuses are located on the most complete version of the Body Computer:

CONNECTOR PIN OUT

CAN NODE OPERATION

Instrument panel node

The Instrument Panel Node is an electronic component connected to the BCAN; it acquires several user commands and manages the SETUP menu and the control of the headlamp alignment.

There are also interfaces with other vehicle systems (engine management) at the connector.

For more details

Op. 5560 INSTRUMENTS

Steering column switch unit control module

The steering column switch unit module includes the exterior lighting controls (on the lights lever on the left) and the windscreen/rearscreen washing and wiping controls (on the wiper lever on the right).

The module also houses the trip function and the optional Cruise Control function.

For more details

Op. 5550 WARNING AND MANOEUVRING INDICATORS

Radio receiver node

The Radio Node is an electronic component connected to the BCAN.

There is an interface at the Radio Receiver Node with an external audio amplifier, with the after market CD Changer and with an external module for the management of the GSM (telephone) and GPS (navigation) systems.

For more details

Op. 5570 ACCESSORIES

Parking sensor node

The Parking Sensor Node is an electronic components connected to the BCAN which provides driving assistance functions during manoeuvres with reverse gear engaged, detecting any obstacles at the rear. There are interfaces at the parkign sensor node for the sensors in the rear bumper and for the buzzer in the instrument panel node.

Op. 5580H PARKING OBSTACLE DETECTION DEVICE

Clock spring

The clock spring is an interconnecting component incorporated in the steering column switch unit module that guarantees the connection between the dashboard cables, the controls on the steering wheel (audio system and telephone system) and the driver''s Air Bag modules.

For more details

Op. 5570 ACCESSORIES

Op. 5580C AIR BAG SYSTEM

Safety system control unit (air bag)

The safety system interfaces with the crossmember cable assembly (front impact sensor), with the dashboard cable assembly (front loads, BCAN management, power supplies) and with the collection of rear cables (side loads/blinds and pretensioners, side impact sensors, sensors on front seats). There is a specific earth point for the safety system located near the control unit.

For more details

Op. 5580C AIR BAG SYSTEM

Climate control sytem control unit

The interface with the automatic climate control system manages input/output information via the CAN (information, data).

The climate control system is connected to the rear wiring via a bridge.

The system power earth is connected directly to the climate control unit by the bridge.

For more details

Op. 5040 AIR CONDITIONING CASING AND COMPONENTS

Rain sensor control unit

The rain sensor control unit is an electronic component connected to the Body Computer Node via the LIN serial line and, together with a control on the steering column switch unit module, manages the function of regulating the speed of the windscreen wiper strokes.

The rain sensor control unit is connected via a special bridge located on the interior rear view mirror.

For more details

Op. 5050 SCREEN WASHERS AND HEADLAMP WASH/WIPE

Tyre pressure control unit

The TPMS (tyre pressure monitoring system) control unit is an electronic component connected to the BCAN that manages the monitoring of the inflation pressure of all four tyres.

For more details

Op. 4450 HUBS AND WHEELS

Bluetooth convergence control unit

The Bluetooth Convergence control unit is an electronic component connected to the BCAN or to the BCAN and CCAN depending on the version which, when interfaced with the on board radio receiver, allows various entertainment functions:

"C1" basic version: hands-free function with Bluetooth interface for user mobile phone and entertainment (MP3)

"C3" de-luxe version NOT AVAILABLE AT THE LAUNCH OF THE MODEL

Brake pedal switch

This is a switch located on the brake pedal that is connected to the rear wiring. It carries out the function of indicating the brake pedal status to provide the control units that require it with the status of the actual pedal.

It has two contacts (NO + NC) with separate power supplies and the same connection.

The following control units require brake pedal status information:

- Body Computer

- Engine management control unit

- Braking system control unit, two versions: ABS, ESP

- Robotized Gearbox Control Unit, if fitted.

Switch on clutch pedal

The clutch switch is a switch located on the clutch pedal which provides the control units that require information on the clutch pedal status.

Control panel on driver''s front door

The control panel on the driver''s frontn door is a module that includes the various controls on the driver''s front door and it interfaces with the driver''s front door collection of cables.

The control panel receives a power supply for the ideogram lighting and for the correct operation of the controls.

Depending on the trim level, it may contain the following controls:

- Electric front windows control

- Electric rear windows control (if fitted)

- Electric rear windows inhibition control (if fitted) with LED

- Exterior electric mirrors selector

- Exterior electric mirrors joystick

Electric window control on front passenger door

The window control on the front passenger door is connected via the passenger front door collection of cables to provide the command for the window opening motor and receives a power supply for lighting the ideogram and for the correct operation of the actual control.

Electric windows control on rear doors

The control on the left rear door and the right rear door is connected via the collection of cables on the rear door and is acquired by means of electronics inside the electric window motor on the rear door with an automatic raising and lowering function with an anti-crush safety device.

The control receives a power supply for lighting the ideogram and for the correct operation of the control itself from the disinhibiting control located in the control panel in the driver''s front door.

Centre control panel

The control panel is connected via the dashboard cable assembly.

The module houses the following buttons:

- City button for switching the electric steering City function on/off

- ASR off button and warning light (LED in button)

- door locking/unlocking button and LED: the LED has the function of signalling the door locking status with the light on constantly; the same LED has a deterrent function when the vehicle is locked from the outside: in this case it is on intermittently.

- boot opening button

- hazard warning lights button

- ECO button for Economy mode function for versions with robotized gearbox.

Left control panel

The left control panel is a module that incorporates the controls on the outside of the steering wheel and interfaces with the Body Computer Node and the Instrument Panel Node via the collection of dashboard cables.

The left control panel receives a power supply for lighting the ideograms and houses the following controls:

- Fog lights

- Rear fog lamps

- Headlamp alignment corrector

- Mode buttons (regulate different functions in the instrument SETUP function).

Electric steering control unit

The interface with the electric steering system manages input/output information via the following serial line: CCAN (information, data).

REPLACING AND INITIALIZING NETWORK NODES

Some of the CAN nodes are programmed with default settings which the customer will discover on acquiring the vehicle.

The nodes storing this information are the:

- Body Computer;

- Instrument Panel;

- Climate control system control unit.

- Air Bag control unit

- Bluetooth Convergence Control Unit.

If the Body Computer is being replaced, an "identical copy" of the Body Computer must be obtained from the Parts Dept as a V.O.R. order supplying the vehicle chassis number: this copy will contain all the default settings entered when the vehicle was new which are stored in the Parts Dept. database for the vehicle chassis number.

If the Instrument Panel, Climate Control System Control Unit, Air Bag Control Unit or the Bluetooth Convergence Control Unit is being replaced, the Parts Dept. will send a pristine component. once fitted; the initial default data must be transferred to it by carrying out the "PROXI ALIGNMENT" procedure using the Examiner.

If other nodes are being replaced, no initialization operation is required. However, always check that the system has not picked up errors during the removing-refitting operations, etc. using the Examiner.

Battery disconnection

If the battery is disconnected:

- Body Computer

- Instrument Panel

- Climate control system control unit

- Air Bag control unit

- Bluetooth Convergence Control Unit.

They keep the information received and do not need to be initialized after the battery is disconnected, whilst the other nodes lose some or all of the information memorized.

Logistic mode

There is software inside the Body Computer that excludes some of the vehicle electrical loads, except the main functions, known as the LOGISTIC MODE:

The activation of the Logistic Mode guarantees the possibility of starting up the vehicle and driving it without adverse effects in terms of safety even if there is a slight lowering of on board comfort standards and certain functions.

This function, managed by software inside the Body Computer, is used to reduce current absorption due to accidental or deliberate activation of unnecessary loads.

The low consumption power supply mode (Logistic Mode) is activated when vehicles are stored in the period between the end of production and when they are handed over to the final customer and allows battery energy saving when the vehicle is parked, possibly for a long time, before being sold.

The following functions are involved in the activation of the Logistic Mode:

• Central locking and remote control commands
• Electric windows movements
• Radio
• Current socket/cigar lighter
• Climate control
• Additional heater
• Sun roof
• Seat heating
• Switching on of courtesy lights and interior lights
• Switching on of fog lights/rear fog lamps
• Switching on of main beam headlamps

The function should be disabled in the workshop before the vehicle is handed over to the Customer.

Deactivation procedure

The procedure is as follows:

- connect the diagnostic device terminal to the vehicle EOBD socket and turn the ignition ON;

- check that the battery recharging warning light is in flashing mode to indicate that the Logistic Mode low consumption mode is activated;

- deactivate the low consumption supply mode by carrying out the fault diagnosis of the Body Computer node using the Examiner;

the Body Computer node will receive the deactivation command from the diagnostic equipment and, in addition to exiting the low consumption conditions reactivating full operation, it will send the Standard Power command to the CANS (BCAN, CCAN, LIN).

- all the control units involved, on receiving the CAN message, will restore their full operation and send a confirmation message to the Body Computer node.

- delete the error memory in all control units with a diagnostic function.

- carry out a key OFF - key ON.

- check that the battery recharging warning light is on constantly.