2001 Tahoe Onstar Bypass?

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=32193
Printed Date: July 06, 2025 at 2:28 AM

Topic: 2001 Tahoe Onstar Bypass?

Posted By: cb229
Subject: 2001 Tahoe Onstar Bypass?
Date Posted: May 15, 2004 at 12:58 PM

I'm trying to install a new head unit in my 2001 tahoe. After installation there is no sound. After reading a few threads here I see it is because of the Onstar system and it needs some kind of adapter. I never use onstar and it is not even subscribed to their service. Is there a way to just completely bypass this? Does anyone have a diagram for the other small harness that goes into the back of the stock unit?

Replies:

Posted By: sexyvic1
Date Posted: May 16, 2004 at 12:37 AM

whats up buddy? i am pretty sure that you will need to wire harness's from metra

one is the 70-1858

and the other is the 70-2006 ( i believe this is the one for the onstar )

good luck

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Posted By: sexyvic1
Date Posted: May 16, 2004 at 12:38 AM

whats up buddy? i am pretty sure that you will need two wire harness's from metra

one is the 70-1858

and the other is the 70-2006 ( i believe this is the one for the onstar )

good luck

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Posted By: cb229
Date Posted: May 16, 2004 at 4:27 AM

I do not want the Onstar hooked up, I do not use it. There is got to be a way to do this without buying a harness. I spliced into the pink wire on the small harness and hooked it to power like I read from a post here. The sound came on and everything worked but there was a spark popping noise coming from the factory amp so I know that is not right. It is close though. All I need is a diagram for the seperate small harness!

Posted By: jwLLL
Date Posted: May 23, 2004 at 1:13 AM

You are going to have to bypass the factory amp with 4 speaker wires. That's it. No harness. Under glove box. Not to each speaker.

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