Terribly sorry to interfere here now but this is the closest topic I have found in any regard to the older one button key fobs, but my 97 e320 does not have key cyl/column in doors and trunk does have but is seized/rusted solid so have been looking for more info on fobs.
Pressing button for about 1 second led in ir lens flashes, good after cleaning terminals inside fob for batteries, 2x 2025 3v
holding at just the right angle not at handle, on either front door, does lock/unlock doors, good, kinda...
doing at appearing lens next to trunk lock cyl, does nothing
And wanted to know if anyone had knowledge or a similar page with instructions for my kind of fob for trunk, or panic, or any other options that may be had in this old of a unit. haha
Thanks so much for any wisdom shared in this regard.