AUTOMOTIVE ELECTRICIANS

Fiat MULTIPLA 1.6 16v fino a 05/99 — CODE — — WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION — WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

Fiat MULTIPLA 1.6 16v  fino a 05/99 — CODE —  — WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION — WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION
Wiring diagram

Components
Component codeNameAssembly reference
B1Junction unitB5MAXI FUSE boxB25Ignition-operated services supply fuse 1554-
B25Ignition-operated services supply fuse 1554-
B35Injection memory and CODE fuse-
C60Earth on engine-
C60Earth on engine-
D1Front/facia junction-
D4Front/engine junction-
D4Front/engine junction-
E50Instrument panelH1Ignition switchM10Engine management ECUM10Engine management ECUM10Engine management ECU-
M10Engine management ECUM10Engine management ECU2891479Op. 1058A GAS CIRCUIT MULTI POINT INJECTION
M10Engine management ECUM20CODE control unitR10Multiple tester connection-
Location of components

Components
Component codeNameAssembly reference
B1Junction unitB5MAXI FUSE boxB25Ignition-operated services supply fuse 1554-
B25Ignition-operated services supply fuse 1554-
B35Injection memory and CODE fuse-
C60Earth on engine-
C60Earth on engine-
D1Front/facia junction-
D4Front/engine junction-
D4Front/engine junction-
E50Instrument panelH1Ignition switchM10Engine management ECUM10Engine management ECUM10Engine management ECU-
M10Engine management ECUM10Engine management ECU2891479Op. 1058A GAS CIRCUIT MULTI POINT INJECTION
M10Engine management ECUM20CODE control unitR10Multiple tester connection-
DescriptionTo increase protection against theft attempts, an electronic immobilizer system known as the "FIAT CODE-2" system has been adopted.The keys are fitted with an electronic Transponder device, which send a coded signal to a special CODE electronic control unit. If it recognizes the code sent, it allows the engine to be started up.The code used in the communication, which takes place via aerial, changes each time the car is started up (rolling code). The code cannot therefore be reproduced, even with electronic scanners.The main function of the Code control unit is to identify the code in the ignition key. The control unit contains a secret code which is used to communicate with the key Transponder.The control unit contains all enabled key codes in its memory, together with the code used in the communication between Code control unit and engine management unit. When the key is turned to MAR for for the first time, if the key is identified correctly, the code is transferred to the engine management unit and is then indelibly linked to the Code control unit. For more details 2888294see DESCRIPTION AND OPERATION:5580Eanti-theft device . The Code system has supply lines for the control unit protected by the maxifuse which also protects the engine management system, by a specific fuse and by the fuse which protects other supplies controlled by the ignition: the two fuses are located in the engine compartment in the relay and fuse box.
Functional description The CODE control unit M20 is supplied at pin 3 by the battery from the line for the maxifuse EFI (UGD) of B5 and is protected by fuse B35. The supply controlled by the ignition (15/54) reaches pin 8 through the line protected bu fuse B25.Pin 4 is earthed. The line leading from pin 6 is a serial line leading to engine management unit M10, which is responsible for identifying the key and exchanging codes. It is possible to "read" the control unit autodiagnostic system, by connecting to the autodiagnostic connector R10 from pin 5 of the control unit M20. The autodiagnostic system also produces the signal for the "CODE failure" warning light, located in the instrument panel E50: it involves an earth signal coming out of pin 2 of the control unit M20. The instrument panel E50 is controlled by the ignition (INT) at pin 2 of connector A from the line protected by fuse F1 of the junction unit B1: when an earth signal reaches pin 12 of connector C, the "CODE warning" light comes on.A second control unit connector is connected via two leads to the aerial, fitted coaxially to the ignition key, in order to detect key insertion and rotation.

Junction unit



B001A



B001A



B001C



B001C



B001D



B001E



B001E



B001E



B001F



B001G



B001H



B001H



B001H



B001I



B001I



B001I



B001J



B001J



B001B



B001B



B001B



B001B



B001B



B001B



B001C



B001C



B001C



B001C



B001C



B001C



B001C



B001D



B001D



B001D



B001D



B001D



B001D



B001D



B001E



B001E



B001E



B001G



B001G



B001G



B001H



B001H



B001H



B001H



B001H



B001I



B001I



B001J



B001J



B001B



B001B



B001B



B001C



B001C



B001C



B001D



B001D



B001D



B001H



B001H



B001H



B001I



B001J



Junction unit



B001A



B001A



B001C



B001C



B001D



B001E



B001E



B001E



B001F



B001G



B001H



B001H



B001H



B001I



B001I



B001I



B001J



B001J



B001B



B001B



B001B



B001B



B001B



B001B



B001C



B001C



B001C



B001C



B001C



B001C



B001C



B001D



B001D



B001D



B001D



B001D



B001D



B001D



B001E



B001E



B001E



B001G



B001G



B001G



B001H



B001H



B001H



B001H



B001H



B001I



B001I



B001J



B001J



B001B



B001B



B001B



B001C



B001C



B001C



B001D



B001D



B001D



B001H



B001H



B001H



B001I



B001J



Ignition-operated services supply fuse 1554



B025



B025



B025



B025



B025



B025



B025



B025



B025



B025



B025



Injection memory and CODE fuse



B035



B035



B035



B035



B035



Earth on engine



C060



C060



C060



C060



C060



C060



C060



C060



Front/facia junction



D001A



D001A



D001A



D001A



D001A



D001A



D001A



D001A



D001A



D001A



D001A



D001A



D001B



D001B



D001B



D001B



D001B



D001B



D001B



D001B



D001B



D001B



D001B



D001C



D001A



D001A



D001A



D001A



D001A



D001A



D001A



D001A



D001C



D001C



D001C



D001C



D001C



D001C



D001C



D001C



D001A



D001C



D001C



Front/engine junction



D004A



D004A



D004B



D004B



D004



D004



D004



D004



D004A



D004A



D004B



D004B



D004B



D004B



D004B



D004



D004



D004



D004



D004B



D004B



D004B



D004B



D004B



D004B



D004B



D004B



D004B



Instrument panel



E050A



E050A



E050A



E050A



E050A



E050B



E050B



E050B



E050B



E050B



E050B



E050B



E050C



E050C



E050A



E050B



E050C



E050C



E050A



E050C



Instrument panel



E050A



E050A



E050A



E050A



E050A



E050B



E050B



E050B



E050B



E050B



E050B



E050B



E050C



E050C



E050A



E050B



E050C



E050C



E050A



E050C



Instrument panel



E050A



E050A



E050A



E050A



E050A



E050B



E050B



E050B



E050B



E050B



E050B



E050B



E050C



E050C



E050A



E050B



E050C



E050C



E050A



E050C



Instrument panel



E050A



E050A



E050A



E050A



E050A



E050B



E050B



E050B



E050B



E050B



E050B



E050B



E050C



E050C



E050A



E050B



E050C



E050C



E050A



E050C



Instrument panel



E050A



E050A



E050A



E050A



E050A



E050B



E050B



E050B



E050B



E050B



E050B



E050B



E050C



E050C



E050A



E050B



E050C



E050C



E050A



E050C


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