honda prelude keys

[sexyceta]

hi to all .i have tried to program keys using red key(not tried to start with it)have original black keys and 2 new original black keys.but now lost sync with ecu as not start with old keys.immo light goes out.can this be done with out diag or is it honda only

[Fallen]

Red key is only to be used with a diag tool apparently.

[sexyceta]

any idea where immo plug is

[ray-ray]

what year is it? the immo. box should be mounted on the colunm with a 10mm bolt.