It could be just coincidence that the warning lights came on after the install, but not likely.
Kenwood makes a great touchscreen unit that can be professionally installed if the installer is skillful enough. It will basically make the whole area where your factory radio was one big touchscreen that plays DVD's, can handle navigation software, etc. I found it at Best Buy for $1800, but opted to just get an in dash DVD player with 3" TFT screen made by JVC. Been really happy with it.