I have a 2000 Bonneville SSEi and my radio has been taken hostage by the Onstar. I inadvertently pressed the emergency button on the rear view mirror and the radio went into phone mode. Now the red light on the right side of the rear view mirror is flashing, and the radio stays on in the phone mode (even with the ignition off, keys removed, doors shut, and no one in the car) How do I reset this and or disconnect the onstar module? Where is the module? Which fuse feeds it?
I want my radio back!
Thanks

Solved the easy way. While searching for an answer, the radio drained the battery and reset the system. I had read on many other forums addressing Onstar that disconnecting the battery wouldn't solve the problem due to it's internal memory, so I feel stupid for not taking the rear seat out and disconnecting the battery in the first place. Live and learn. I will be very careful in the future when adjusting the read view mirror.

If you don't have a subscription to OnStar then just disconnect it. It's behind the passenger side of the rear seat back. My OnStar was "waking up" overnight and draining my battery almost once a week. I have not had a dead battery since I disconnected the OnStar.