So I’ve got the exact same issue as the person who posted this: http://www.justanswer.com/toyota/758d9-toyota-sienna-xle-limited-2005-sienna-brake-light-issue.html
Went to the Toyota dealership this afternoon and it looks like a wiring issue. Also found out when the left blinker is engaged, it blows the 10A STOP fuse which then causes the ABS and VCS(?) lights to illuminate. What a mess…
Is the easiest way to fix this just to run a new wire to the affected area? The folks at the dealership seemed to suggest they were going to need to rip out all the interior to find the break in the circuit.
Timing-wise, this problem starting happening right after I went to get emissions checked and they plugged a cable into the data port to pull emissions(?) and other data. My hunch is that these two events are directly related but I don’t have much knowledge of how things are wired up and hoping someone can provide some insight into what might have caused this problem.