Chat
Contact us
Close contact box
Connect ID #
329 681 686 3
Connect ID #
329 681 686 3
All finished with your chat session?

We’ll email you a transcript of this conversation for your records.

All of our representatives are
currently chatting with other customers.

Please enter your name.  
Please enter a valid email address. Why is this required?
Please enter your US phone number.  

For Tech Support, call 1-888-292-2575

Thank you, !
Our conversation will be emailed to
Chat Advisor Image

Your Advisor,

More about me
Please enter a question  
Don't wait on hold. We'll call you back when it's your turn to talk with the next available .
Please enter your name  
Please enter your phone number  

Please enter a message  

Calls may be recorded for training and quality control purposes.

We are located in Virginia USA.

PAC OS-1 Wiring Interface

Connect a new car stereo and retain OnStar® in select GM vehicles

Item # 127OS1

PAC's OS-1 interface lets you replace any General Motors radio (without RDS) while maintaining operation of the...

Find what Fits your vehicle

PAC's OS-1 interface lets you replace any General Motors radio (without RDS) while maintaining operation of the...

Gigi
Need help?
Contact our Virginia-based experts.
Discontinued item

Item # 127OS1

Gigi
Need help?
Contact our Virginia-based experts.

About the PAC OS-1 Wiring Interface

PAC's OS-1 interface lets you replace any General Motors radio (without RDS) while maintaining operation of the OnStar® system. The OS-1 has on-board switching and built-in amplification that allows audio from the OnStar® system to play through the two front factory speakers when OnStar® is active, while muting the replacement radio.

PAC's OS-1 interface lets you replace any General Motors radio (without RDS) while maintaining operation of the OnStar® system. The OS-1 has on-board switching and built-in amplification that allows audio from the OnStar® system to play through the two front factory speakers 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. 1-year warranty.

Note: The OS-1 will interface with all GM radios that do NOT have the "RDS" option — it works with Bose and standard GM radios. If there is an "RDS" logo on the radio face, the OS-1 will not work.

What's in the box:

  • 1 GM OnStar Interface adapter with 7" OS-GM9 Molex plug and a 44" ground wire
  • One 12" OS-1618 harness
  • One 6.5" OS-RAD harness
  • One 6" OS-GM21 harness
  • Instructions
MFR #OS-1

Customer reviews

Loading reviews...

PAC OS-1 Wiring Interface reviews

Average review:

5 reviews

Thanks for submitting your review

Filter by rating

Customer photos

Sort reviews

Sort by:
Items per page:
View page:

Verified customer (What's this?)
Verified employee purchase (What's this?)

Pros:

Cons:

Crutchfield response

<< >>

More details on the PAC OS-1 Wiring Interface

Stacey B.

Product Research

Features

Applications: The OS-1 is an interface that allows for the replacement of a GM factory radio that doesn't have RDS, while maintaining the operation of the OnStar navigational system. The OS-1 has onboard 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. 

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.

Harnesses: The harnesses allow the OS-1 to be installed in either a Bose or Non-Bose factory system. Refer to the instructions for specific information on wiring configuration for your particular application.

Inputs/Outputs: On the left side of the adapter, there is an 18-Pin Male Molex plug. On the right side of the adapter, there is a 16-Pin Male Molex plug, and there is a 7" harness with a 9-Pin OS-GM21 connector. Refer to the instructions for specific information on wiring configuration for your particular application.

Loading accessories...

Customer Q&A

Loading articles...

TOP