There is an alarm contact. This contact does not make contact with the body of the radio because the body has a plastic insulator. On the 220 car it is on the left side, so when we put in an aftermarket radio we put a piece of tape on the body to act as an insulator.
On the 210 I think the insulator is on top.
Some people unplug the wire to the contact and then cover the end with tape so it will not touch metal. Then you will not get a beep.
Even with the beep the alarm system still work. The beep is to let you know something is wrong with the system.
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