The workaround is to tint the windows more.

Or, alternatively, you could put up a Monty Burns style sun blocker to block out the sun entirely.

Seriously, there is no way to work around it. All car audio products suffer from this problem in some form or another.

The worst part for me is that bright sun seems to conflict with the IR receiver's ability to get codes from my steering wheel remote. I'm still working on a workaround for this... Physically moving the IR receiver to the other side doesn't look do-able, so some serious engineering is going to have to go into this problem.

I feel your pain.

-Tony
MkII #554