Did you try Terry Mosher's method?I know this is an old thread, but I’ve had this Metra unit since April of this year. Have several issues that have not been resolved.
1. Right turn signal usage stops display
2. Steering wheel volume controls don’t work while in reverse
3. Steering wheel phone controls won’t answer or end call.
I’m hoping to try Terry Mosher’s alternative to the metra unit over Xmas break.