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The 'security card' is the one for your radio anti-theft code . . Since
he'll have your power disconnected, he will need that code to reactivate
your radio when he's done . .that's all that part is about.

If you feel you need to warm up your car to 'treat your engine better',
it's not actually true. Honda engines (actually all modern engines) work
best and last longer if warmed up gently, by driving them. They take too
long to warm up while idling, and burn very inneficiently, dumping
excess moisture and acids into your oil. It wouldn't be so bad as long
as you go for a long drive and dry some of that stuff out. If your
owner's manual is like mine, it probably says you shouldn't 'warm up'
the car. Start it and drive (gently).

And yes, the way your guy is talking about installing it _might_ mean
he's compromising your immobilizer, unless he's putting your valet key
in one of those powered key 'shields' which only expose the (hidden) key
when the alarm calls for it.

Knowing the brand name and model, as well as the country you in, might
clarify your question for the people around here who would know the more
exact answer.

'Curly'