323001066 - 5505 INSTRUMENT/GAUGE ELECTRICAL CIRCUITS

Structure of electrical/electronic system

The electrical equipment on this vehicle uses the "NANO F.L.ORE.N.C.E." structure developed specifically to incorporate the most up to date electronic functions in an optimum manner.With a view to improving the system, the layout of this structure is as follows: each control unit (electronic or electromechanical) is located in a centre of gravity position in relation to the functions managed.This structure makes up the car''s nervous system, directly controlling all the bodywork functions (access control, visibility, on board information, comfort, etc.) and communicates with the various chassis and power unit subsystems improving system fault diagnosis, reliability, weight and cost.A further advantage compared with traditional systems is simplified installation, thanks to a reduced number of control units (the same number of functions are offered to customers) and power and signal connections, through the extensive use of serial communication networks (2 CAN twin wire communication networks, 1 single wire LIN sub network, 1 A-BUS single wire sub network).Power distribution takes place by means of two junction units and relay/fuse boxes, connected to the control elements (static actuators and relays). These control units also act as an interconnection for the wiring and as an electrical distributor to ensure the maximum level of protection and the minimum degree of wiring complexity.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.The structure components can be grouped together in two categories:

Electronic components
Electric power control unit (FUSE BOXES)

Electronic components

The main electronic components managed by the NANO F.L.ORE.N.C.E. structure are listed below:

Identification code	Electronic components	Wiring diagram code
NBC	Body Computer Node	M001
NCM	Engine Management Node	M010
NQS	Instrument Panel Node	E050
NRR	Radio Receiver Node	P020
NCV	Bluetooth Control Unit Node	M162
NCR	Robotised Gearbox Control Unit Node	M054
CSP	Rain sensor control unit (incorporated in the electrochromic mirror)	P065
NFR	Braking Node	M050
NYL	Yaw Sensor Node	K074
NAB	Air Bag Node	M060
NCL	Climate Control Node	M070
NSP	Parking Sensor Node	M084
NAS	Steering Angle Sensor Node	K058

Electric power control unit (fuse boxes)

There are two fuse boxes /relay junction units:

Dashboard Control Unit (CPL)
Engine Compartment Control Unit (CVM)

Identification code	Fuse boxes	Wiring diagram code
CVM	Engine compartment control unit	B001
CPL	Dashboard control unit	B002

Network structure

The NANO-FLORENCE structure is composed of:

2 CAN communication networks which connect NODES belonging to two different areas: one for the dynamic control of the vehicle (C-CAN) and one for the so-called "bodywork" functions (B-CAN);
1 A-BUS serial line for wiping functions;
1 F ISO 5 serial line for monitoring the braking system status;
1 K ISO 5 serial line for the diagnostic function for several NODES / CONTROL UNITS.

NODES are all the electrical/electronic devices and control units that contain a specific interface (NETWORK INTERFACE) that allow data, information and signals travelling via the CANs to be transmitted and received.

The two C-CAN and B-CAN networks are physically separate, but both flow into the BODY COMPUTER NODE; the latter, which is considered the MASTER node for the two networks, is also the GATEWAY function which allows the transfer of information/data from one network to another.Given the different specifications of the two networks, illustrated below, the data transmission speeds are different:

B-CAN transmission speed = 50Kbit/sec.
C-CAN transmission speed = 500 Kbit/sec.

Priority in case of transmission conflict for several nodes When two or more nodes try to use the same communication channel simultaneously, there is a contest for access to the bus.An integral part of the communication protocol for the Nano-Florence system is the arbitration procedure which allows the access contests to be solved, guaranteeing the transmission of the message with the highest priority without losing either time or information.

B-can

The B - CAN, as indicated previously, is the low speed serial network designed for the on board / bodywork functions. It uses two cables (0.35 mm² section), one White (CAN-A) and one Blue (CAN-B).The information is transmitted digitally via this pair of wires with differential type signals, in other words there are 2 voltage levels, one High and one Low associated with the CAN-B and the CAN-A cables, respectively; the mathematical difference between these two levels produces two associated voltage values at two logic levels 0 or 1.The data transmission through differential type signals makes it possible to produce a considerable lack of sensitivity to electromagnetic interference, a fundamental requirement in automotive applications.B-CAN connection diagramThe diagram for the B-CAN for the full optional version of this model is illustrated below.

The nodes connected to the B-CAN, on the most extensive version, are listed in the table below.

Identification code	Electronic components	Wiring diagram code
NBC	Body Computer Node	M001
NAB	Air Bag Node	M060
NCL	Climate Control Node	M070
NQS	Instrument Panel Node	E050
NSP	Parking Sensor Node	M084
NRR	Radio Receiver Node	P020
NCV	Bluetooth Control Unit Node	M162
CPL	Dashboard control unit	B002

C-can

The C - CAN is a high speed serial communication network designed to allow communication for components involved with the dynamic control of the vehicle. It comprises two twisted electrical cables (intertwined 0.35 mm² section), one Green (CAN-H) and one Brown (CAN-L).C-CAN connection diagramsThe diagrams for the C-CAN for all the most important trim levels of this model are illustrated below.VERSION WITHOUT ABS/ESP

VERSION WITH ABS

VERSION WITH ESP

MTA ROBOTIZED GEARBOX VERSION WITH ESP

The nodes connected to the C-CAN, on the various versions, are listed in the table below.

Identification code	Electronic components	Wiring diagram code
NBC	Body Computer Node	M001
NAS	Steering Angle Sensor Node	K058
NYL	Yaw Sensor Node	K074
NFR	Braking Node	M050
NCR	Robotised Gearbox Control Unit Node	M054
NCM	Engine Management Node	M010

A-bus line

The A-BUS line is a serial line that allows the automatic windscreen wiper function to be be managed through the connection between the rain sensor (CSP) incorporated in the electrochromic rear view mirror and the Body Computer Node (NBC).The A-BUS line transmission speed is 9.6 Kbit/sec.A-BUS line connection diagram The A-BUS line diagram is illustrated below.

The nodes connected to the A-BUS line are listed in the table below.

Identification code	Electronic components	Wiring diagram code
NBC	Body Computer Node	M001
CSP	Rain Sensor Node	P065

F line

The F line is a serial line that makes it possible to monitor the status of the braking system through the connection between the ABS/ESP control unit (NFR) and the Body Computer Node (NBC).The connection takes place via the ISO 5 serial line.

K lines

All the K lines for the electronic control units flow into the 16-way EOBD (European On Board Diagnosis) diagnostic connector integrated in the Body Computer Node (NBC).The diagnosis of the nodes connected to the B-CAN network is carried out via the CAN, whilst the diagnosis for those connected to the C-CAN network is carried out by means of the specific K lines (ISO 5 serial lines).K lines connecting diagramThe K lines diagram is illustrated below.

The nodes connected to the EOBD diagnostic socket are listed in the table below.

Identification code	Electronic components	Wiring diagram code
NBC	Body Computer Node	M001
NFR	Braking Node	M050
NCR	Robotised Gearbox Control Unit Node	M054
NCM	Engine Management Node	M010
CPL	Dashboard control unit	B002

Fault diagnosis

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:

NODE	DESCRIPTION	DATA BUS	FAULT DIAGNOSIS	DIAGNOSTIC BUS
NBC	Body Computer Node	B-CAN/ C-CAN	YES	B-CAN
NFR	Braking Node	C-CAN	YES	K line
NCR	Robotised Gearbox Control Unit Node	C-CAN	YES	K line
NCM	Engine Management Node	C-CAN	YES	K line
NAB	Air Bag Node	B-CAN	YES	B-CAN
NCL	Climate Control Node	B-CAN	YES	B-CAN
NQS	Instrument Panel Node	B-CAN	YES	B-CAN
NSP	Parking Sensor Node	B-CAN	YES	B-CAN
NRR	Radio Receiver Node	B-CAN	NO	-
NCV	Bluetooth Control Unit Node	B-CAN	YES	B-CAN
NAS	Steering Angle Sensor Node	C-CAN	NO	-
NYL	Yaw Sensor Node	C-CAN	NO	-
ABS	ABS (serial line)	F line

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