Had the same problem and still do... BUT I think I know why it happend to me. In the process of soldering on LED's in place of those stock A/C control board bulbs, the solder jumped the circuit and I'm pretty sure fried the board.
I installed a flat 5 LED strip behind it, wired to the same relay as the head lights. No dimmer controls, but at least i've got lights
![grin grin](https://celicahobby.com/forums/images/graemlins/celica/grin.gif)
All fuses have been checked, I'm just pretty sure I nuked the board.