Components

The CODE control unit M20 is supplied at pin 3 by the battery via the 20A EFI maxifuse of B5 and the 7.5A fuse B35.

The supply controlled by the ignition (15/54) reaches pin 8 through the line protected by the 7.5A fuse B25.

Pin 4 is connected directly to earth C13.

The connection between pin 6 of the Code control unit M20 and pin 7 of the engine management control unit M10 is the serial type; the recognition dialogue for the key and the exchange of codes takes place via this connection.

The control unit M20 is connected, via pin 5, to the diagnostic coupling R10.

The autodiagnostics system produces the signal:, via pin 2, for the 'CODE failure' warning light located in the instrument panel E50, connector B pin 11.

The instrument panel E50 is supplied via pin 18 connector A by the 10A fuse 22 of B1. Fuse F22 is supplied by the ignition switch via the contact INT; when there is an earth signal, produced by the control unit M20, at pin 11 of the instrument panel E50, the 'CODE failure' 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.

COMPONENTS