Metra Adapters GM0S-05 or GMRC-04

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=73862
Printed Date: May 15, 2025 at 1:54 AM

Topic: Metra Adapters GM0S-05 or GMRC-04

Posted By: Mr_Fusion
Subject: Metra Adapters GM0S-05 or GMRC-04
Date Posted: March 03, 2006 at 7:01 PM

Anyone here familiar with Metra's GM0S-05 or GMRC-04? If someone has the install manual for it, it would be greatly apreciated if you could make it available for me to view, at least the wiring diagram. Thank you!

I am looking to retain door chime, RAP and maybe On-Star in a 2000 Bonneville. The car also has an external amp (Bose system a.k.a. U80). I don't care about retaining the external amp because the car is getting new amplifiers...if anyone here has any experience with this car or other adapters, please reply.

Replies:

Posted By: tcss
Date Posted: March 03, 2006 at 7:08 PM

I've used the GMOS-04 and it's great. Simple install, no external speaker needed, saved me a bunch of time.

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There is no such thing as free installation!

Posted By: Mr_Fusion
Date Posted: March 03, 2006 at 7:56 PM

How does the adapter interrupt the signal to the front speaker to play its chime??

Posted By: tcss
Date Posted: March 03, 2006 at 8:14 PM

I think it uses the same data as the stock HU. All you do is plug it in and wire up the deck. Saw you were replacing the factory amp. Havn't done that yet, I would call Metra tech support and see if that would cause any problems.

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There is no such thing as free installation!

Posted By: Mr_Fusion
Date Posted: March 03, 2006 at 9:11 PM

Does the new HU's speaker outputs connect to the Metra adapter at all??

Posted By: kgerry
Date Posted: March 04, 2006 at 12:04 PM

just did a Bonneville the other day with a GMRC-04 and it worked fine... OK, the first one i put in wouldn't shut the chime off, but the second one worked fine.... ( Thank God, i always order at least 2 of everything... one to show and one to go....)

make sure (if you can) that it's software version 3.4 or higher.....

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Kevin Gerry
Certified Electronics Technician
MECP First Class Installer

Owner/Installer
Classic Car Audio
since 1979

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