Bypass OnStar radio shut down. Yes the OnStar does shut down the radio. This can be bypassed by diconnecting the Switched 12v wire coming from your module to the radio. (the brand of module you have does not matter) When the OnStar is activated the module shuts down the radio by cutting power to this wire and the OnStar takes over. By moving the 12v Switched wire to another source keeps the radio powered up during OnStar operations. (usually the steering column is a good source for another Switched 12v source) Your radio will stay powered up during OnStar operations.
Bypass the Onstar ste