PAC C2R-GM11B Wiring Interface

Connect a new car stereo and retain safety warning chimes in select 2004-08 Chevrolet and Pontiac vehicles w/o OnStar

Item #: 1272RGM11B

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39 Reviews

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PAC's C2R-GM11B radio replacement interface lets you replace the factory radio in select 2004-up Chevrolet and Pontiac vehicles that aren't equipped with OnStar®, while retaining all factory warning chimes and audible turn signal indicators. Warranty: 1 year.

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.

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

PAC C2R-GM11B Wiring Interface Reviews

Average Customer Review:

39 reviews
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Written By Bbass, Ohio on Monday, September 28, 2015

Crutchfield Customer Review (What's this?)

After you get done with this Very tricky install it works flawlessly just have to get to that point first

Pros: Works just the way it's supposed to

Cons: Very tricky install

Great Product

Written By Jeremy H, Cincinnati, OH on Monday, September 14, 2015

Crutchfield Customer Review (What's this?)

Great product that made install go quick and removed what used to be a major headache from the install process.

Pros: Easy to use, clear instructions, straightforward installation

Cons: None that I have noticed


Written By Red B., Texas on Thursday, September 10, 2015

Crutchfield Customer Review (What's this?)

Excellent product ! Glad to know that someone took all the guess work out of installing after-market equipment in late model vehicles !

Pros: Direct connection to late model vehicle wiring system !

Cons: Cant think of anything bad to say about product !

Great product. Perfect.

Written By JohnP, Ventnor, NJ on Saturday, August 22, 2015

Crutchfield Customer Review (What's this?)

Worked perfect and installed easily. Great buy.

Pros: Easy. Works.

Cons: None

Little blue magic box

Written By Anonymous, Georgia on Sunday, July 26, 2015

Crutchfield Customer Review (What's this?)

Easy to wire and hook up. This little blue magic box will rout the electrons through it's circuitry and enable the use of your factory wiring harness to your speakers and system.

Pros: Easy to follow instructions. It didn't let the smoke out when powered up.

Cons: We could a man on the moon in '69 but we can't make the little magic box any smaller? Really?


Written By jim w, worcester ma. on Wednesday, June 03, 2015

Crutchfield Customer Review (What's this?)

Easy to hook up all color coded and works great

Pros: Easy installation

Cons: Not sure i really needed this in my 2006 chevy malibu since i have 2 chimes now one from the pac and one from the car but it works great.

Worked as described.

Written By Joe T, Massachusetts on Friday, May 01, 2015

Crutchfield Customer Review (What's this?)

Worked as described in my 2006 Cobalt LS Sedan w/o on star or premium audio. Has the option to add door chime, but I didn't need this to I switched it off as the 05-06 have a separate speaker for the door chime (the newer ones play through the speaker). Also used the RAP connection for the remote wire of the subwoofer I just bought. Works great. I plan to use it for one of the cigarette outlets and increase the current rating (1A normally, going to increase that for for GPS)

Pros: Works Relatively cheap considering you only need to unplug one connector to return to a fully stock system. Easy to use.

Cons: None to speak of. Heads up, a soldering iron and tape is recommended for the connections.

PAC C2R-GM11B Wiring Interface

Written By TylerF, NY on Monday, April 27, 2015

Crutchfield Customer Review (What's this?)

Great product, does what it says, no glitches whatsoever. Easy to install and a perfect fit with my Ponitiac G6 and JVC unit. Wire connections seem tight and secure without any wiggle room or slip. I would recommend this to anyone. This was my first time ever installing an aftermarket radio, sub, and amplifier. I would go with Crutchfield in a heartbeat for my next vehicle audio installation.

Pros: Easy install - Quality made

Cons: None!

Great Product!

Written By LarryB, Amarillo, Texas on Thursday, March 26, 2015

Crutchfield Customer Review (What's this?)

Perfect fit, easy to install, made the installation of the new Kenwood unit into my 2005 Chevy Cobalt a snap! Easiest radio installation I have ever had.

Pros: Simple, easy, perfect fit. Can't say enough about how great this product is! I had my new radio up and running flawlessly in about 30 minutes.

Cons: NONE!

2005 Chevy Cobalt PAC Wiring Interface

Written By Vincycle61, Pennsylvania on Sunday, March 15, 2015

Crutchfield Customer Review (What's this?)

PERFECT FIT, Flawless instructions installation was simple and painless


Cons: NONE


Written By Eric, Circleville ohio on Saturday, February 07, 2015

Crutchfield Customer Review (What's this?)

Great fit with no problems at all.

Pros: Everything fit like it should thank you

Cons: None

Nice product

Written By takohio, Ohio on Tuesday, January 13, 2015

Crutchfield Customer Review (What's this?)

Nice product. easy install. no cutting into the automobile harness. Plus in my GM automobile it keeps the audio head powered up. until the door is opened. Very nice feature if using Bluetooth.

Pros: easy and works

Cons: none

PAC C2R-GM11B Wiring Interface

Written By kaylin, summit ms on Saturday, January 10, 2015

Crutchfield Customer Review (What's this?)

used when installing new radio and this product made it very easy

Great PAC C2R-GM11B Wiring Interface

Written By JT, Pittsburgh, PA on Thursday, October 16, 2014

Crutchfield Customer Review (What's this?)

I purchased this item along with an aftermarket JVC head unit in order to connect my factory wiring harness to the JVC's. It also retained the car's chimes, and Driver Info Center in my '05 Chevy Cobalt.

Installation was smooth using Crutchfield's directions and a little bit of the internet.

My only suggestion for first timers like myself is not to get overwhelmed with all of the colored wires. Just wire them up one at a time. Also, test everything before you screw the head unit back in.

Pros: Easy installation

Cons: Slightly pricy, but you can get it for half the price when ordering a head unit.


Written By memo, Miami, FL on Monday, July 28, 2014

Crutchfield Customer Review (What's this?)

Easy to install, as it is necessary

Pros: easy to install. easy to switch on/off

Cons: all alerts sound twice. once by the car still and once by the adapter.

Works as advertised

Written By Mark, Oregon on Wednesday, July 23, 2014

Crutchfield Customer Review (What's this?)

this let me replace my stock radio with a nice new cd/bluetooth/radio and keep all the chimes. works as advertised

Pros: works

Cons: still have to listen to the chimes....

Made life so easy!!!!

Written By Jarrod K., Boise, ID on Monday, June 23, 2014

Crutchfield Customer Review (What's this?)

This was great. Made it so easy to wire the new stereo!!!

Works as advertised

Written By A. Rodriguez, Glenside, PA on Wednesday, May 28, 2014

Crutchfield Customer Review (What's this?)

The adapter makes it simple to connect the radio to the car. It would probably be almost just as easy to connect the cables directly, as they are all color coded on both sides, but I'm not sure if there are some fuses or on-way gates in the adapter. Turn off the beeping sound if you're installing this on a Chevy Cobalt 2006, it is not necessary (contrary to what the description says, the warning sounds on that car does not come from the stock radio, but from elsewhere in the dashboard).

Pros: Straight-forward.

Cons: Requires splicing a lot of cables, so make sure to get wire connectors/nuts. Very overpriced, the profit margin on this must be of several hundreds percent, but there is no competition, so we are stuck.


Written By Anonymous, Rutherfordton, NC on Wednesday, April 23, 2014

Crutchfield Customer Review (What's this?)

This made putting my radio in so much faster and it was well worth the money!

PAC C2R-GM11B Wiring Interface

Written By BRUCE H., DARLINGTON,PA on Tuesday, April 01, 2014

Crutchfield Customer Review (What's this?)



Cons: NONE


Written By Amanda, Copenhagen, NY on Tuesday, February 04, 2014

Crutchfield Customer Review (What's this?)


Good Wiring Harness

Written By Derrick D., Haltom City, TX on Monday, January 13, 2014

Crutchfield Customer Review (What's this?)

This wiring harness was easy to understand and use, even though it turns that this particular wiring harness was probably not strictly necessary for my car.

The Crutchfield research said that my car (a 2005 Chevrolet Cobalt LS Coupe) required this harness if I wanted to keep the warning chimes for my car; as it turns out, my warning chimes were not connected to the factory stereo, so I could have bought a much cheaper wiring harness.

Pros: Ease of Use and Installation

Cons: None

PAC C2R-GM11B Factory Integration Adapter

Written By Ron, Elk Grove, CA on Friday, January 10, 2014

Crutchfield Customer Review (What's this?)

After splicing wires, it's all plug and play. Great product that made installation of new Sony stereo in my daughters 2005 Malibu a breeze while retaining the factory information center functions..

Pros: Very cool kit that fits perfect and everything plugs into the factory plugs for easy integration of new stereo and information center.

Cons: None so far.

Not sure i needed it

Written By Concerned, Allison Park PA on Tuesday, December 31, 2013

It kept the key and door functions, but I purchased it for the warning chimes and turn signal sound. Turns out I did not need it for that and had to turn off that function on the adapter.

Pros: Does what it says it will.

Cons: A little misleading on Crutchfield's part, as I did not need it for warning chimes and turn signal sounds.

Adapter Kit

Written By JimL, Brisbin, Pa on Thursday, December 26, 2013

Crutchfield Customer Review (What's this?)

Very easy to use.

PAC C2R-GM11B Wiring Interface

Written By Anonymous, Champaign IL on Monday, December 16, 2013

Crutchfield Customer Review (What's this?)

Didnt know what i was doing half the time, but it seemed to work!

Pros: Works well

Cons: Instructions were too vague

Perfect integration

Written By Cookie, MA. on Saturday, December 07, 2013

Crutchfield Customer Review (What's this?)

Ties the Alpine deck into the cars systems flawlessly.

Pros: Perfect fit

Cons: None


Written By Oclaf, Fonix, AZ on Thursday, September 26, 2013

Crutchfield Customer Review (What's this?)

worked as described. a must have part that works, is easy to install.

Pros: its just what you need. and small enough to not be an issue putting the dash back together

Cons: none i can think of

PAC C2R-GM11B Wiring Interface

Written By Anonymous, fort wayne, in on Monday, September 02, 2013

Crutchfield Customer Review (What's this?)

It was easy to install and seems to work correctly, EXCEPT for one problem. Sometimes the sound won't work when the car is first turned on, but after cycling the radio on and off, it works. So idk what's causing it.

Crutchfield response on Monday, September 02, 2013 We forwarded this review to our Technical Support team for follow-up. Lifetime tech support comes with every Crutchfield purchase.

Awesome unit!

Written By Samuel G., Daleville, IN on Thursday, July 11, 2013

Crutchfield Customer Review (What's this?)

I love this stereo! Does everything I want and is very affordable.

Pros: Many features and great looking. Also quite easy to install!

Cons: Finish can scratch if you don't use the right kind of wipes on it.

Easy to use

Written By Anonymous, Charlotte NC on Tuesday, April 02, 2013

Crutchfield Customer Review (What's this?)

Installed in Chevy Cobalt and made the wiring setup very easy. Painless install.

Pros: Simple easy to use setup

Cons: none

i can hear my chimes in my car now and everything works pefectly

Written By joe, Bristol, CT on Monday, March 11, 2013

Crutchfield Customer Review (What's this?)

great product and easy to install. everything works great

Great product

Written By JenDav, Beaufort on Monday, March 04, 2013

Crutchfield Customer Review (What's this?)

I've had it in my car for about a month now and everything works fine. It retained my cars chimes and was very easy to install.

Pros: It provides an accessory wire so you don't have to tap in for power elsewhere, like the fuse box or ignition

Cons: None

GM integration adaptor works good, but I miss trip mileage

Written By PatrickD, Saint Cloud, MN on Friday, October 12, 2012

Crutchfield Customer Review (What's this?)

Works great, maintains power when the car is shut off. That being said, I was hoping for some type of way to maintain oil change and trip mileage tracking. Not a huge deal, but I will miss the automated alerts and easy gas mileage calculations.

Pros: Install ease, maintain factory power process

Cons: Loss of mileage computing

If you want a smooth install

Written By MG, Idaho on Tuesday, August 14, 2012

Crutchfield Customer Review (What's this?)

This really made the install easy and I think it is great Crutchfield offers these things at half the price when you buy a stereo from them. Saved a lot of solder and trouble shooting.

Works Great

Written By Tbay, Ohio on Friday, July 01, 2011

Crutchfield Customer Review (What's this?)

I have a 2006 Chevy Cobalt LT with no pioneer system or on star. Just normal Cobalt.

This works great with it. One thing to note, I forgot to turn off the chime, if you aren't annoyed with dual chimes, that install it as is, if you don't like chimes, turn it off before installing...just FYI

PAC C2R-GM11B Wiring Interface

Written By montalvo, St Pete, Fl on Monday, April 26, 2010

Crutchfield Customer Review (What's this?)

Does it's job right, and best of all, this is the cheaper version if you don't want to use OnStar.

Good but too expensive

Written By douglas, Winter Haven, Fl on Sunday, October 26, 2008

Crutchfield Customer Review (What's this?)

Without it my car wouldnt even start or if it did the gauges would drop so i couldnt do anything. I would give it a 5/5 for the product but its too much. I didnt buy it with my reciever but i would highly reccomend doing it that way to get 50% off.

Easy enough

Written By Mike, Syracuse, NY on Sunday, August 03, 2008

Crutchfield Customer Review (What's this?)

I installed this in my wife's 2007 Chevy Malibu Maxx with a new Alpine CDA-
9884. This had to be integrated with the harness for the Metra OEM dash
adaptor that has wiring for both the HU and the computer. Had to pull a
few pins from the harness included with the PAC and pushed them into the
one that came with the Metra, also I had to splice a few lines. A little
coordination and it all came together.

Functionaly, the car chimes on its own, so I disabled that. Other than that,
the unit stays powered when the car is turned off, until the drivers door is
opened. Just like its supposed to. Im not sure it was worth the price, but its certianly not a bad thing.

Hands-on research

What's in the box?

Download owner's manual

  • GMLAN warning chime and radio replacement interface
  • OEM to interface adapter harness
  • Installation instructions

Product Research


Overview: The PAC C2R-GM11b GMLAN Warning Chime and Radio Replacement Interface allows easy connection of an aftermarket stereo in select General Motors vehicles without Onstar; please see "Outfit My Car" to confirm compatibility. This interface provides connections for the new radio's power, illumination, and speaker leads. With the C2R-GM11b, the new radio will replicate all factory chimes and audible turn signals. It also provides a data bus generated 12 volt accessory output, so the factory RAP system remains intact (Retained Accessory Power, RAP, keeps the radio powered after the key is removed from the ignition until the driver's door is opened, or ten minutes passes, whichever comes first).

Compatibility: The C2R-GM11b Radio Replacement Interface for GMLAN 11-bit vehicles without Onstar is compatible with the following GM vehicles with or without a factory amplifier:

  • Pontiac: 2005-2009 G6
  • Chevrolet: 2005-2006 Cobalt, 2004-2008 Malibu (2008 Malibu Classic only), 2004-2007 Malibu Maxx

Steering Wheel Controls: If your vehicle has steering wheel controls (and the aftermarket radio is compatible) they can be integrated using the optional PAC SWI-RC or the SWI-CP5 steering wheel control interface (sold separately).

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 verify what’s in the box, 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.

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