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PAC OS-1 Wiring Interface

Connect a new car stereo and retain OnStar® and the Bose® audio system for select GM vehicles

Item # 127OS1BOSE

PAC's OS-1 wiring interface lets you replace a General Motors radio (without RDS) with an aftermarket receiver...

Find what Fits your vehicle

PAC's OS-1 wiring interface lets you replace a General Motors radio (without RDS) with an aftermarket receiver...

Discontinued item
3 questions - 4 answers

Item # 127OS1BOSE

Since 1974

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About the PAC OS-1 Wiring Interface

PAC's OS-1 wiring interface lets you replace a General Motors radio (without RDS) with an aftermarket receiver while maintaining operation of the OnStar® system and the GM Bose® amplifier and speakers. The kit includes:

PAC's OS-1 wiring interface lets you replace a General Motors radio (without RDS) with an aftermarket receiver while maintaining operation of the OnStar® system and the GM Bose® amplifier and speakers. The kit includes:

  • the OEM-1 premium sound system interface, which allows quick connection of an aftermarket receiver (or an additional amplifier) to the GM Bose system, without the need to cut wiring;
  • the OS-1 adapter, which allows the use of the OnStar system with an aftermarket receiver. The OS-1 has on-board switching and built-in amplification that allows audio from the OnStar system to play through the two front speakers (factory or replacement) when OnStar is active, while muting the replacement radio.

The OS-1 can also send OnStar audio to an external set of speakers if desired. There are separate right and left gain controls for OnStar audio, and an LED indicator that turns on when the OS-1 receives an "On" command from the OnStar® system. Dimensions: 4-13/16"W x 1-1/16"H x 2"D (OS-1 adapter). Please enter your vehicle information or call an Advisor at 1-888-955-6000 to find out if this model is compatible with your vehicle.

Important Note: The OS-1 kit will interface with GM Delco/Bose radios that do NOT have the "RDS" option. If there is an "RDS" logo on the radio face, the OS-1 kit will not work. Warranty: 1 year.

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What's in the box:

  • OS-1 GM OnStar Interface adapter with attached 7" wire harness (6-pin Molex plug on end)
  • OEM-1 Factory Sound System Interface
  • 12" OS-1618 harness
  • One 8" OS-RAD harness with attached Emitter
  • One 7" AMP-GM21A harness
  • Installation Instructions
MFR #OS-1/BOSE

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More details on the PAC OS-1 Wiring Interface

Stacey B.

Product Research

Features

Applications: The OS-1 BOSE is an interface that allows for the replacement of a GM factory radio, that doesn't have RDS, and maintain the operation of the OnStar navigational system and the factory GM Bose sound system. The OS-1 BOSE has on board switching and amplification that allows the audio from the OnStar system to play through the front speakers when OnStar is active, and mutes the replacement radio.

Compatibility: The OS-1 BOSE is compatible with the following select 2002 and older General Motors vehicles: Chevy Avalanche, Cadillac Escalade, Chevry Silverado, GMC Sierra, Chevy Surburban, Chevy Tahoe, and GMC Yukon, plus 2000 and older Chevy Blazer, GMC Jimmy and Chevy Lumina. It will also work in some 1999-2003 Pontiac Grand Prix and 98-99 Bonneville. The OS-1 BOSE will interface with all GM radios that use 21-pin/9-pin connectors and have Bose amplifier/speakers. If there is an "RDS" logo on the face of the radio, this interface will not work. Please check the Crutchfield Vehicle Selector for compatibility with your vehicle.

Contents: The OS-1 BOSE interface consists of the OS-1 On-Star interface and the OEM-1 Premium Sound Interface, plus the wire harnesses that plug between the two interfaces and the factory sound system and On-Star system.

Left and Right Gain Controls: The OS-1 adapter has independent left and right controls that adjust the level of audio coming from the OnStar system.

LED Indicator: This is an indicator on the OS-1 that lights up when OnStar is active.

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Customer Q&A

3 questions already asked

Q
I have a 2002 Yukon Denali that I've purchased with an aftermarket head unit that had the pax os-1 interface installed. I'm now putting a 10" sub and a aftermarket amp in. My question is, do I tap into the remote in between the headunit and the 1st box of the interface, or should the remote wire be connected to the interface in the first place? All wires are spliced together minus a mute, and a power antenna coming from the headunit. Factory Bose is 100% working.
[ Evan  Feb 15, 2015 ]
1 answer
A
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/.
[ Krissy  Feb 17, 2015 ]  Staff
Q
I am wondering if I need to purchase this product because I am not using the on star and do not plan on using it. I am keeping all of my factory Bose speakers, as well as adding a sub to the trunk space. Will the new head unit, stock speakers and subwoofer still fiction correctly without this product?
[ Sean  Mar 17, 2014 ]
2 answers
A
I have never used the on star , actually i want to remove this system. Will this stereo system work on my tahoe ?
[ Diego  Nov 27, 2014 ]
A
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this is needed.
[ Jeff  Mar 18, 2014 ]  Staff
Q
looking to buy single din pioneer stereo to replace oem bose head unit want to keep stock Bose speakers and oem amp I also want to add a separate amp for my subs in trunk Is this Adapter what I need? thanks
[ phil  Mar 13, 2014 ]
1 answer
A
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you.
[ Jeff  Mar 13, 2014 ]  Staff

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