Gilera Nexus 500, Workshop Manual, Page: 249 / 406

Set the switch to " ON " and select the diagnostic
tester menu to the immobiliser function.
Scroll the pages to display the control unit data.
N.B.
AN UNPROGRAMMED SYSTEM CANNOT BE DETECTED UPON FIRST FITTING, OR IN CASE
THE DECODER AND THE CONTROL UNIT ARE REPLACED CONCURRENTLY.
The information will be as follows:
Unprogrammed control unit « ON »
Start-up disabled « ON »
Key number Zero › 250
Setting the circuit
The scooter is supplied with two keys:
- Master key (red) with removable transponder
- Service key (black) with fixed transponder
The master and service keys must be used to code the system as follows:
- Insert the master key, set to « ON » and keep this position for 2 seconds (limit values 1÷3 seconds).
- Insert the black key and set to " ON " for 2 seconds.
- If you have copies of the key, repeat the operation with each key.
- Insert the master key again and set to " ON " for 2 seconds.
The maximum time to change keys is 10 seconds.
Seven service keys (black coloured) can be programmed within the same storage operation.
It is essential to adhere to the times and the procedure. If you do not, start again from the beginning.
Once the system has been programmed, master key transponder, decoder and control unit are strictly
matched.
With this link established, it is now possible to encode new service keys, in the event of losses, re-
placements, etc.
Each new programming deletes the previous one so, in order to add or eliminate keys, you must repeat
the procedure using all the keys you intend to keep using.
N.B.
AN ACCIDENTAL LOSS OF THE SERVICE KEY PROGRAMMING CAN ARISE FROM GENERAL
FAULTS OF THE IGNITION SYSTEM. IN THIS CASE, CHECK THE HV LINE SHIELDING.
In any case it is advisable to use resistive spark plugs.
Nexus 500
Injection
INJEC - 57