I think that you'll need to post a wiring diagram for the system before anyone will know if this is complete or will work. These aftermarket keyless entry systems have some sort of circuit with a bunch of wires hanging off and the remote fobs. It appears that you've got these two items, now this trick is proper installation.

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Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE