I have power through the TIU to the track
Do you mean that you are using the FIXED 1 circuit? If not, you MUST power the TIU itself through the AUX post, using a 12-18 volt wall wart or similar power supply. When properly powered, a LED lights inside the TIU, in the corner near the VARIABLE 1 input.
when I power up you can hear the locomotive go into DCS mode.
How do you know which mode it is in? The sounds are the same whether in conventional or DCS mode. On my layout, I set the conventional volume pots higher, so I can tell from the volume. Turning on the power with no DCS signal on the tracks will cause a conventional sound.
