The immobilizer allows the vehicle to be started only if the rider uses the special ignition key which sends the identification code to a decoder housed in the instrument panel. The transmission-receiving system is composed of a TRANSPONDER housed in the ignition key heads and an antenna in the vicinity of the ignition switch.

The transponder is fitted inside the key grip and consists of a power supply circuit, a ROM (Read-Only Memory) and a transmis­sion circuit. The transponder is supplied with power by the magnetic field generated by the antenna which is enabled as soon as the instrument panel is switched on. Since the transponder is very compact and needs no external battery power supply, it is moulded permanently into the key grip.

The antenna (A) is fitted onto the ignition lock cover (B), which is specifically modified for the purpose to create a seat in which the antenna is inserted and restrained.

At key-on (switching on the instrument panel by turning the key) the decoder (incorporated in the instrument panel) activates the antenna, which emits an electromagnetic field that serves to power the transponder in the key grip. The transponder responds by transmitting the code that is stored on its internal ROM memory, and which is picked up by the antenna and relayed to the decoder. Here the transponder code is compared to a second code. If the outcome of the comparison is positive, engine starting is enabled.

Set the ignition switch to OFF.

Refitting is the reverse of removal; in particular, tighten the screw (3) and nuts (1) to the specified torque (Sect. C 3, Frame torque settings).