onstar 2005 Hummer H2
 

I have a 2005 Hummer H2 with onstar still installed but not working, the last owner installed a aftermarket stereo which works with the steering controls but I found out that onstar does not interface with the after market stereo. so onstar is not working. My question is I bought an original factory radio to put back in the Hummer so my question is once the factory radio is re-installed will onstar work? second I noticed that I have a mic above the visor drivers side and a small speaker above the drivers side I assume this is to hear and talk to onstar? thank you for any input before I install the factory radio which I had already unlocked. I may have the dealership install the radio have not decided as of yet.

I see you posted the same question in the correct section.... H2 tech questions go in the H2 section. NO tech questions go here. This is supposed to be for "hello I am a new guy" stuff.

Welcome to HF.

It would be near impossible to answer as we have no idea what the installer of the aftermarket radio did.

Ontsar is garbage, fuggling useless.