Troubleshooting/Parts location

Hi guys,

2000 Avalon XL

I'm pretty sure I've lost a ground (or hot) somewhere for my brake lights.

I've checked/replaced the usual:

fuse,
brake
switch,
replaced bulbs


Tail lights are working, but there's no voltage for the brake lights at either of the three lights. I don't have a wiring diagram, and if anyone does have and can email to me I'd appreciate it.

Otherwise, can you give me any help locating the problem? Are there additional components other than what I've listed above?

Thanks,

Terry