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  • GMOS-01 GM Data Interface 2000-2013 - Freeman's Car Stereo


GMOS-01 GM Data Interface 2000-2013




* Provides accessory (12 volt 10 amp) * Retains R A P (retained accessory power) * Retains chimes * Provides NAV outputs (parking brake - reverse - speed sense) * Pre-wired ASWC-1 harness (ASWC-1 sold separately) * Retains chimes to the factory speaker * Adjustable chime level * Retains OnStar / OE Bluetooth * Adjustable OnStar level * Designed for non-amplified models or when bypassing a factory amp(See note below) * Retains balance and fade * USB-CAB updatable (sold separately) *NOTE:* If the vehicle is amplified either use the GMOS-04 interface or bypass the amplifier. If bypassing the amplifier follow the Axxess Interface Amp Bypass Schematic online.
* *Buick* ** Century 2004-2005 ** Lacrosse 2005-2009 ** Rainier 2004-2007 ** Regal 2004 ** Rendezvous 2002-2007 ** Terraza 2005-2007 * *CADILLAC* ** Escalade (See note below) ** Escalade ESV & EXT (See note below) * *Chevrolet* ** Avalanche 2003-2006 ** Cavalier 2000-2005 ** Colorado 2004-2012 ** Corvette 2005-2016 (See Note Below) ** Express 2003-2007 ** Impala 2000-2005 ** Kodiak C4500-C8500 2003-2009 ** Malibu 2001-2003 ** Malibu Classic 2004-2005 ** Monte Carlo 2000-2005 ** Silverado Classic 2007 ** Silverado 2003-2006 ** SSR 2003-2006 ** Suburban 2003-2006 ** Tahoe 2003-2006 ** Trailblazer 2002-2009 ** Uplander 2005-2008 * *GMC* ** Canyon 2004-2012 ** Envoy 2002-2009 ** Savana 2003-2007 ** Sierra 2003-2006 ** Sierra Classic 2007 ** TopKick C4500-C8500 2005-2009 ** Yukon 2003-2006 ** Yukon XL 2003-2006 * *Hummer* ** H2 (See Note Below) ** H3 and H3t 2006-2010 * *Isuzu* ** Ascender 2003-2008 ** H-Series 2003-2008 ** I-Series 2006-2008 * *Oldsmobile* ** Alero 2001-2004 ** Bravada 2002-2004 ** Intrigue 2002 * *Pontiac* ** Aztec 2001-2005 ** Grand Am 2001-2005 ** Grand Prix 2004-2008 ** Montana SV6 2005-2006 ** Sunfire 2000-2005 * *Saab* ** 9-7x 2005-2009 * *Saturn* ** Relay 2005-2007 *NOTE* These vehicles are standard for a factory amplifier. Either use the GMOS-04 interface or bypass the amplifier. If bypassing the amplifier follow the Axxess Interface Amp Bypass Schematic online.

Shipping Options

U.S. 48 Only

For all items eligible for shipping:

FREE: 1-5 Business Days UPS

Expedited Shipping Options: Calculated At Checkout

Large Item Shipping Costs: Calculated At Checkout

Return Policy

Our policy lasts 30 days. If 30 days or less have gone by since your purchase, we are happy to issue a refund or exchange.

To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.


Non-returnable items:

Gift cards

Installed Products


To complete your return, we require a receipt or proof of purchase.

Please do not send your purchase back to the manufacturer.


There are certain situations where only partial refunds are granted (if applicable):

Any item not in its original condition, is damaged or missing parts for reasons not due to our error

Any item that is returned more than 30 days after delivery


Refunds (if applicable):

Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.

If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.


Late or missing refunds (if applicable)

If you haven’t received a refund yet, first check your bank account again.

Then contact your credit card company, it may take some time before your refund is officially posted.

Next contact your bank. There is often some processing time before a refund is posted.

If you’ve done all of this and you still have not received your refund yet, please contact us at


Sale items (if applicable)

Only regular priced items may be refunded, unfortunately sale items cannot be refunded.


Exchanges (if applicable)

We only replace items if they are defective or damaged.  If you need to exchange it for the same item, send us an email at and send your item to: 19010 Statesville Rd Cornelius North Carolina US 28031.



If the item was marked as a gift when purchased and shipped directly to you, you’ll receive a gift credit for the value of your return. Once the returned item is received, a gift certificate will be mailed to you.


If the item wasn’t marked as a gift when purchased, or the gift giver had the order shipped to themselves to give to you later, we will send a refund to the gift giver and he will find out about your return.



To return your product, you should mail your product to: 19010 Statesville Rd Cornelius North Carolina US 28031


You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.

To reach customer service please email


Depending on where you live, the time it may take for your exchanged product to reach you, may vary.


If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.

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