RE: 02 Trailblazer - Service OnStar message
If you haven't already purchased the digital upgrade for your vehicle, you have 2 options. Buy the digital upgrade. GM was paying for the parts, you just had to buy 1yr subscription. I am unsure if GM is still paying for parts. The other option is to have your dealership disable the OnStar system (which GM is currently paying for). If you don't want to bring it to the dealership, and have an analog system, just pull all the conectors from the VCIM which is under the RR seat and that will disable the system
If you have a question, ask it in the forums. I will no longer be answering questions sent to my email.