2002 ml320 delay lock and unlock

Good morning I have a 2002 ml320 with 80k miles. I have a problem when I press the button(lock or unlock). first of all It do not work at once. After pressing button several times, it works but takes a time too much. Sometimes it works immediately but it's rare. It's same siuation tried to do this after changing battery of FOB. Where is the receiver of remote control?? What can I check for this problem??? Thanks in advance.

Good morning
I have a 2002 ml320 with 80k miles. I have a problem when I press the button(lock or unlock).
first of all It do not work at once. After pressing button several times, it works but takes a time too much.
Sometimes it works immediately but it's rare.
It's same siuation tried to do this after changing battery of FOB.

Where is the receiver of remote control??
What can I check for this problem???

Thanks in advance.

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