Yesterday I attempted to install a brake light modulator on a neighbor's 2010 RS. It's the exact same module I have on the CD third brake light on my RT.

I cut the wires to the brake lights, and installed the module. When I powered the bike up, I got a DSS error, check engine light was flashing, and the display read "limp home mode". I disconnected the module, hooked the brake lights back up as factory, and everything reverted to normal. I did this about 4 times, same results each time.

What in the heck could be causing all that mischief just by installing a brake light modulator? Mine's been working perfectly. I don't get it, especially the limp home mode.

Thoughts?