The keyfob may or may not have buttons. this is in case got
problem with the smart entry system, then can override the system
by pressing button to open the doors. if the manufacturer say got
intelligent keyless entry, but yet your keyfob have a few buttons
in it, it means that the doors will still unlock when u are within
proximity of the car. so u don't need press the button.
if immobiliser is faulty, then contact the manufacturer if u can't
start engine, either that or the car will start irregardless of the
position of the keyfob. if u go JB, and ur car has keyless
ignition, the robbers sure will press u for the keyfob. haha.. so
have fun.
actually also quite pointless leh all this intelligent keyless
entry and immobiliser. normally the key and keyfob attached
together, so when robbers mug ur keys, the keyfob also will be with
them what.. don't know for what.. marketing strategy lah.. make u
pay for rubbish. even if ur car has keyless ignition, the robber
just steal ur keyfob(i think its as easy as stealing ur keys) then
ride and go lor.