Hey
Mine did the same thing.  I took it to the dealer and got a bunch of lies.
They told me it was a short in the loom somewhere. Wrong.... I suppected the
ECM and asked them to trouble shoot it.  They said it was ok, another
lie..... I ended up installing a switch bypassing the ECM. I think its
called an ECM, don't have my book with me. But that solved the problem.. I
just have an extra switch to turn on when I turn my lights on...  If you
want I can tell you the process for installing the switch. Its really not
that hard.  Hope this helps.
later