[busta9]

I recently purchased a 2002 escalade and the door chimes, onstar etc are not hooked up due to the previous owner and an aftermarket stereo. Does anyone know how to hook this back up?

 

[hcvone]

Did you put the stock system back in? Many aftermarket sound systems will not work with the stock things like OnStar, others offer connection kits that can be added

 

[ewill3rd]

Some companies make an interface kit that will allow those systems to work with an aftermarket radio. Otherwise those won't function unless you reinstall the factory audio equipment.
I have seen some of these devices but I forget who makes them.

 

[slk230mb]

PAC makes devices like that.