Hi Nelson,

On our 89, 90, and 91 sedans the trunk works along with the doors, just as it does when you use the keyswitch or button. It doesn't "pop" the trunk or anything like that, and the valet feature which, frankly I don't have a use for and would have to read up on, would work no differently after installing the keyless. The wagon hatch works just like another door.

However, on our older (pre-86) 240's, the electric trunk latch is optional and not tied to the door locks. One 83 has a button in the glove box, and I have removed the motor from a junk yard car to do the same in another car if I ever get around to it. The three-button key fobs have that function available, but I haven't used it. I wired one "third button" to the interior lights, but that proved to be a waste of time. Although this keeps Matt's good thread at the top of the index, we really should take the keyless entry subject to a new thread, and post year/model information.
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Art Benstein near Baltimore

If money doesn't grow on trees, then why do banks have branches?