Originally Posted by RockinWagin

Actually my 84 300SD does have the "magic" cable under the rear seat on the driver side. However, I can pull as much as I want and nothing happens. Is there a magic phrase I am supposed to say at the same time?

Actually, to respond to the question, I thought that I was having the same problem and did not try to do anything about it until my battery went dead one day and only the driver door would unlock with the key. I tried the trunk and it did not unlock the first time so I tried again (one definition of insanity is that you keep trying the same thing with the same result) and found that if it turned the key and pushed the button in at the same time, the trunk would unlock. It has worked the same way since then.