Question about Metra Gmos 01 Gm Onstar Class II Interface

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I need an Install manual for a Metera GMOS_01

This is to put a Kenwood stereo in an 2005 GMC Envoy and retain the onstar and chimes. I bought the GMOS-01 on ebay without the paperwork.

Kent Bowers

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Do a search on line you can download for free...

Posted on Jan 22, 2011


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It will fit, but the parts are expensive and it is not plug and play.

Parts needed:

Dash kit- Metra 99-3305 About $15-$20

Antenna adapter- Metra 40-CR10 (Chrysler antenna adapter) Yes GM uses Chrysler parts. About $10-$15

Wire harness/Interface- GMOS-LAN-01 (non bose or onstar) About $100
GMOS-LAN-02 (bose/onstar) About $120

The reason for the pricey harness is to retain data features on the vehicle and to interface with Onstar (GMOS02).

This is the right way so don't cut corners because it can cause issues on your brand new vehicle.

All of your safety chimes run through the stereo and not using the correct interface can cause issues with your gauges or are good sources for install parts info

May 14, 2010 | Pioneer AVIC-F900BT Car GPS Receiver

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Special wiring harness for new stereo in 2005 sierra

Yes u do....I have an 03 sierra and apparently they changed everything in 03.....the harness is over $100.....but u need it....and they dont sell a reg wiring kit from 03 and up....if it was an 02, then yes u could get away has to do with the steering wheel switches

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Replacing factory radio

With that year vehicle it is recommended that you use a special harness because it has an factory amp and in order to get the proper wiring it requires the harness also if you don't use the harness you will loose your onstar and vehicle chimes and warning sounds.

Oct 08, 2008 | 2004 GMC Envoy

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