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Anti theft alarm:
All modern cars have some kind of alarm system. You have to know how they works, iv your car battery goes down the alarm will be reset and you have to set it up once again.
My plan today was to do some work on my car, but ...
Welcome to Sweden!
I did some research on internet instead. I found that in Europe the remote controlled anti theft alarms are transmitting in the 400 MHz radio band, this car is imported from US and they use the 300 MHz radio band. So what I understand they have replaced the original transmitters in the keys with the two extra I have to get it certified for Europe. Then I shouldn't change anything, and when I replaced the battery in the second remote control it started working directly. I must say that I'm not 100% sure about about the frequencies they transmit at.
This is the setup procedure I have found how it should work:
This is the setup procedure how my car work, not exactly as above:
If you for some reason want to reset the old setup I think it's most easiest to disconnect the car battery for five minutes.
I'm very happy to know that the original alarm is still operating in the car. If I can repair the original keys remote transmitter there is no need to have this extra remote controllers with me.
Some radio / CD players have a protection code you must enter after disconnected the battery, the radio in my car was not of that construction luckily because I didn't have any code for it.
When I bought the car I ordered these replacement shells for the fob keys. Later I shall do this work and take the old keys apart and install the new shells. It will look great! Today I don't use the built in remote in these keys, I have a separate remote. But according to the information I have found these keys need two Lithium batteries each, CR 2016, to have the remote to operate.