I have bought the IC2 set loc 37449 + coaches 43486-43490, a very nice consist.

Unfortunately Märklin failed to tune the decoder settings of the loc and the cab control car to each other. If you allocate the same address to the cab control car and the loc, the lights change nicely with direction, but functions F1 to F4 have different effects in loc and the coaches.

I therefore wanted to remap F1-F4 in the loc to the unused numbers F24-F27 to make the conflict disappear. I have the following tools to do this:

mSD3 decoder tool: this gives the message that it cannot change a factory installed decoder

Lokprogrammer via DCC protocol: I can read and change individual CVs but when trying to retrieve the decoder settings it says “Unsupported decoder”

Intellibox 1: Not yet tried, as I always could get any job done with one of the methods above

There should be a way to change the mapping via entering individual CVs, but where can I find documentation? What I found so far only deals with functions up to F12.

Plan B is to allocate different addresses and link them via the control software, but I prefer to treat the whole train set as one with only one address.

Best regards,
Gregor

Edited by user 19 April 2023 17:11:38(UTC)  | Reason: Not specified

Found a suitable PDF with the table values, but not the way to proceed. That I found on the stummiforum,this page. This page also contains the link to the proper pdf.

Bit fiddly indeed, but it worked.

Thanks Alan, but I already managed it by changing individual CVs and I learned something in the process.

I just find it a bit strange that Märklin offers the full sound project on their website for free, but does not allow to change anything on the factory installed decoder via the decoder tool. If function mapping can be changed via the manual way, why not offer this functionality much easier via the tool?