Originally Posted by pinero2
here's the latest on the radio/control head compatibility..... i talked to Becker. if your bike had an old radio/cassette that was upgraded to radio/cd, you must use radio model #6534 to maintain radio/control head compatibility.
Not sure about a model #6534, but any radio for a 1999-2004 LT will work with only a small antenna connection cable mod if switching from a cassette to c/d model (small cable available from BMW). I emphasize this because in the last year or so another board member had a problem with radio compatibility, called Becker and got some erroneous information. Not knocking Becker................ but they make a lot of radios for a lot of different combinations. Bottom line any '99-04' BMW badged Becker radio will interchange with any RCU/radio combination in that same model range, but you should be careful not to mate the ones that will give you the battery drain problem.
Once BMW went to the digital dash (2005) the radios were modified for that application and will not work on the earlier bikes. As a matter of fact, all the radios look exactly the same whether they're from a R1200CL, R1200RT, or K1200LT, but only those designed for the '99-04' LTs will work on your bike. They'll all turn on when installed in your bike, but you can't control them - I found out the hard way as did you, apparently.
The gist of my previous post was almost the same as the Word article that jzeiler recommended, but with a little more technical data that I've been able to gather. As a matter of fact, after rereading the word document, I think I am the original author. To reemphasize, check the RCU/Radio software. Since your system is not currently functional, determining software versions is going to be tough for you. You may have to try your units in another bike. RCU version 2 will work with any radio. RCU version 3 will only work with radio version 7.0. If youíve got RCU version 3.0 and any Radio version other than 7.0, youíre going to need to change one or the other. The RCU is the least expensive of the two of course. The radio that I eventually put in my bike had a sticker on it indicating it was 7.0 located on the top side of the plastic fuse holder on the back of the radio unit.
Hope this sheds some light on your project. If you need any further information let me know. Since this is real old stuff, why don't we take this off board and use the PM method from now on.