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PAC OS2C-CTS Wiring Interface

Connect a new car stereo and retain OnStar®, warning chimes, and the premium amplified audio system in 2003-07 Cadillac CTS or SRX models

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  • PAC OS2C-CTS Wiring Interface

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Our take on the PAC OS2C-CTS Wiring Interface

by Zak Billmeier
PAC

PAC's OS-2C-CTS interface lets you replace the radio in 2003-up Cadillac CTS and SRX models while maintaining operation of the OnStar® system, warning chimes, and rear parking assist chimes. The OS-2C-CTS will work with standard GM or Bose amplified audio systems. Warranty: 1 year.

Note: This interface will not work with 2004-06 SRX models with Cadillac navigation radios. You'll lose the factory XM receiver and the ability to fade from front to rear speakers when you install an aftermarket stereo. 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.

See more info on this item

Note: Most vehicles will require additional installation parts — please identify your vehicle if you haven’t done so, then check here for a list of parts. You can also call an Advisor for more information.

Hands-on research from the Crutchfield Labs (what are the Labs?)

Product Research
What's in the box?

Download owner's manual

  • OS-2C-CTS Radio replacement interface module (for GM vehicles with OnStar)
  • CM1 Chime output module
  • 13" Vehicle harness (OS-CTS)
  • 8" Radio harness
  • Radio Replacement Installation Instructions
  • Chime Module Installation Instructions

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Features
Dimensions

Features

Overview: The PAC OS-2C-CTS Radio Replacement Interface Module allows the installation of an aftermarket radio into select Cadillac CTS and SRX vehicles equipped with OnStar and a factory amplified audio system.

Note: You may use this interface even if the vehicle does not have OnStar, but does have the factory amplified audio system.

Vehicle Compatibility: The PAC OS-2C-CTS Radio Replacement Interface Module supports the following vehicles.

Make Model Year Restrictions
Cadillac CTS 2003-2007 All models
SRX 2004-2006 Only vehicles without factory installed navigation radios

Note: The OS-2C-CTS does not retain the factory XM receiver, you will lose this option when the factory radio is replaced with an aftermarket headunit. Due to the design of the factory amplified system, there is currently no way of fading from the front to rear with an aftermarket radio.

OnStar Compatible: The PAC interface module will maintain operation of the OnStar and factory amplified audio system. OnStar audio will play through the front speakers when active. Your vehicle's OnStar volume will not be adjustable (preset at medium level).

Warning Chimes: The PAC OS-2C-CTS also retains all warning chimes and vehicle rear parking assist chimes.

Steering Wheel Control Compatible (optional): The PAC OS-2C-CTS is compatible with PAC's Steering Wheel Radio Control Interface (541SWIRC, sold separately) for aftermarket radios.

Dimensions

Radio Replacement Interface Module (OS-2C-CTS):

  • Width = 6.455"
  • Height = 1.055"
  • Depth = 2.475"

Chime Output Module (CM1):

  • Width = 2.325"
  • Height = 0.915"
  • Depth = 0.925"
 
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PAC OS2C-CTS Wiring Interface Reviews

Average Customer Review:

8 people say:

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5 out of 5

Works well

Written By Bill, Northern VA on Thursday, April 10, 2014
Crutchfield Customer Review (What's this?)
 
OK, here is the down and dirty on this adapter. It's a great product, works well with my car. However, the instruction manual has TINY writing where it comes to whichg wires go where on each car - just tiny! Good thing the give the online version. Anywho, the wires from your harness plug directly into this units secondary harness, after you look up your car's wiring in the manual. It's pretty simple but a novice (like me) has to take their time on this. That said I did it per the book (and also watched it online) and it was a 1st time go - no issues.

So yes I say get it!!
Pros:
Easy to connect and assemble.
Cons:
VERY BULKY UNIT, and much more so when you coulpe this with several other modules like the steering wheel control module, the dinger and so on.. Not to mentione all the cables like RCA, back up cable, speakers blah blah (it's a lot of junk back there). But I made it fit!! Also, the manual has tiny very print in the appendex area - which is the most important part of this operation
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4 out of 5

PAC OS2C-CTS Wiring Interface

Written By Anonymous, Long beach, CA on Wednesday, March 05, 2014
Crutchfield Customer Review (What's this?)
 
It made the install in my car very easy all I had to do was put some wires together. And it still let me keep my factory amp. For the pice you get it for. It is worth it. Great product.
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5 out of 5

PAC OS2C-CTS Wiring Interface

Written By Anonymous, detroit mi on Monday, May 27, 2013
Crutchfield Customer Review (What's this?)
 
Piece of cake to hook up, works as it should.
Pros:
Easy install
Cons:
None
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5 out of 5

PAC OS2C-CTS Wiring Interface

Written By hamilton, marietta on Friday, April 19, 2013
Crutchfield Customer Review (What's this?)
 
Really great radio would highly recommend. Easy to install and tech support very knowledgeable. Would purchase products in the future
1 out of 1 people found this helpful
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5 out of 5

Great

Written By fatboy, Clewiston, FL on Sunday, July 29, 2012
Crutchfield Customer Review (What's this?)
 
At first thought it was gonna be a nightmare at first glance but just follow the instructions given and by the time u know it you will be enjoying your aftermarket radio!!!
Pros:
Detailed Instructions!!!!!!!
Cons:
None!
1 out of 1 people found this helpful
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5 out of 5

This is Great!

Written By Tim H., Wakeman Ohio on Tuesday, May 08, 2012
Crutchfield Customer Review (What's this?)
 
Without this interface I didn't have the knowledge to install the unit in my cts, it just works perfectly, even the speeker wires colors are the same as the replacement stereo unit
Pros:
everything
Cons:
none
1 out of 1 people found this helpful
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5 out of 5

PAC OS2C-CTS Wiring Interface

Written By C.R, Winder, GA on Thursday, February 09, 2012
 
Work perfect in a 2007 CTS
Pros:
Everything
Cons:
Not one
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2 out of 5

PAC OS2C-CTS Wiring Interface

Written By Anonymous, Ansonia, CT on Monday, March 28, 2011
Crutchfield Customer Review (What's this?)
 
First unit i ordered didnt work. Crutchfield promptly sent . New unit that worked fine. Makes it difficult to mount head . Unit because of the size but after alot of work got it to fit..
3 out of 5 people found this helpful
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1 question already asked

my radio was sent i (not here) to have the cd player repaired and when it came back and was installed THEFTLOCK appeared. is this what I need to make it all work again? please help 2007 CTS [ Estellene  Feb 24, 2014 ]
1 answer
  • 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 Staff  Feb 24, 2014 ]

For a more in-depth review and enhanced detailed information on the PAC OS2C-CTS Wiring Interface, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_541OS2CCTS/PAC-OS2C-CTS-Wiring-Interface.html ).

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