This may sound stupid, but make sure you are aiming the remote AT one of the IR (infrared) sensors on one of the door handles (or trunk sensor if it has one)when you are pressing the trunk button on the remote.
Gilly

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FYI the only thing thats 100% infared on the 140 is the remote windows. You can test this by putting your hand over the front of the remote and pressing the trunk release. It will still release regardless of an infared signal or not.

This is on his SL (r129) not a w140 BTW. I have no idea what the differences were between the two with regards to the remote/keyless entry systems.

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

And your point is? I read the initial post. The 140's and 129's are very similar in the operation of their keyless entry systems.

I could be wrong but I think it uses BOTH IR and RF for the trunk, if one fails the other may work.
Gilly

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Thanks for the all the input. It's very frustrating because one remote all the buttons work, but it won't start the car, and the other will start the car but the trunk button doesn't work.


I bought 2 unused (but coded) remotes on ebay. There must be a way to reprogram these things !

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1998 SL 500 Sport (Samantha)
2005 E 55 AMG (Dr. Jekyl)

Wish there was. Think of it this way. You have a really nice car. $422 in replacement keys is a small price to pay for the fun you have with it.