GP40 support for CV21 & 22

[BestSnowman]

I've got a pair of DCC equiped Bachmann GP40's that I'm trying to consist. I'm using CV19 to define the consist address and direction (which works) but the lights on both of them won't turn on. CV's 21 and 22 are both set to 255 (which should equate to all functions working) for both locomotives. Am I missing something?

[BestSnowman]

Figured it out, in order to turn the light on you have to key up the locomotive address and turn the light on. It won't respond to functions from the consist address.