2002 Trailblazer w/ Onstar
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=16332
Printed Date: September 11, 2025 at 8:30 PM
Topic: 2002 Trailblazer w/ Onstar
Posted By: edt1221
Subject: 2002 Trailblazer w/ Onstar
Date Posted: July 15, 2003 at 1:33 PM
I am itching to replace my factory head unit in my 2002 trailblazer with onstar. What is the best way to interface an aftermarket head unit with the onstar system? Any advice would be greatly appreciated.
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ED THOMPSON
Replies:
Posted By: bberman1
Date Posted: July 15, 2003 at 2:09 PM
it a factory bose system?
Posted By: edt1221
Date Posted: July 16, 2003 at 8:40 AM
No, It is not a bose system. But it is class 2 wiring as the door chimes come thru the speakers.
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ED THOMPSON
Posted By: Velocity Motors
Date Posted: July 16, 2003 at 8:54 AM
Get a OnStar bypass module as well as the Databus bypass module. This will help retain the OnStar and also will get rid of the OEM deck from the vehicle instead of having to have the OEM deck still in the truck somewhere. You can get these modules from anywhere that sells Metra or Ventura products.
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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: edt1221
Date Posted: July 16, 2003 at 10:54 AM
Thanks for your help.
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ED THOMPSON
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