Check the instruction sheet. Using DC I found there were no problems with the lights working directionally. DCC operation is explained in the DCC instructions. Using a 6 function decoder, if the cab lights are required, and a 4 function decoder for no cab lights. Fitting your own decoder one needs to check the function mapping of said decoder and adjust to suit the AUX 1 and AUX 2 outputs to your respective F switch (Function). I used F8 for the AUX 1 function on a LokSound V4 decoder.
I'm pleased with the model it looks good and runs well, but I can't find the cab light switches on the PCB. My only niggle is with the buffer beam hook, a Hornby or Bachmann type would have been better.
HTH
Mike