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I'm a Newby so please don't drill me on this. I purchased a car that came with no key fog. I bought an OEM used key fob from ebay.com. I went by the instructions and can't program it to save my life. I tried four times as what the instructions say and on the fourth its supposed to lock the doors ect. Well it doesn't . As I sat in my car trying to figure this one out above the rear view mirror there is this thing that looks like part of the alarm system. I press the button and it lights blue and I can turn it off . I have no idea what that does. can someone explain what this is and what else I can try to get my key fob to work. I put a new battery in it, when I press the button it lights up.

 
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I also made sure the doors were closed as well when trying to program.

 
Rep Power: 223

What year and trim Civic do you have?

 
Rep Power: 222

That sounds like there's an aftermarket remote start/alarm installed. Your car may not have factory keyless entry. If you can find the remote start module and get a brand and model number you might be able to get remotes for it. The programming procedure is different

 
Rep Power: 243

Does the blue light thing look like this?



Lower trim level generally didn't have key less entry. Sounds aftermarket though.

 
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Yes it looks like that, My Honda is a 2004 Civic EX Automatic coupe.

 
Rep Power: 243

That's an aftermarket antenna. Look under your steering column for a module.

That particular antenna is a DEI brand one. Viper, Clifford, Python are the popular DEI brands.

EX should have factory key less but it may have been removed for the aftermarket system.

 
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Snap. ok I will look for it tomorrow.