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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

Save with a compatible car stereo with a compatible car stereo
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  • PAC C2R-GM11B Wiring Interface

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Our take on the PAC C2R-GM11B Wiring Interface

by Ken Nail

PAC C2R-GM11B

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.

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

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

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).

 
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PAC C2R-GM11B Wiring Interface Reviews

Average Customer Review:

25 people say:

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3 out of 5

Adapter

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.
Was this review helpful?    Yes | No
 
4 out of 5

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....
Was this review helpful?    Yes | No
 
5 out of 5

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!!!
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4 out of 5

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.
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4 out of 5

Easy-peasy

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!
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5 out of 5

PAC C2R-GM11B Wiring Interface

Written By BRUCE H., DARLINGTON,PA on Tuesday, April 01, 2014
Crutchfield Customer Review (What's this?)
 
WELL WORTH THE MONEY
Pros:
WORKS AS ADVERTISED
Cons:
NONE
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5 out of 5

AWESOME

Written By Amanda, Copenhagen, NY on Tuesday, February 04, 2014
Crutchfield Customer Review (What's this?)
 
Awesome!
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5 out of 5

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
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5 out of 5

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.
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4 out of 5

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.
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5 out of 5

Adapter Kit

Written By JimL, Brisbin, Pa on Thursday, December 26, 2013
Crutchfield Customer Review (What's this?)
 
Very easy to use.
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4 out of 5

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
Was this review helpful?    Yes | No
 
5 out of 5

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
Was this review helpful?    Yes | No
 
5 out of 5

PAC C2R-GM11B

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
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4 out of 5

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.
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5 out of 5

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.
Was this review helpful?    Yes | No
 
5 out of 5

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
Was this review helpful?    Yes | No
 
5 out of 5

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
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5 out of 5

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
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4 out of 5

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
2 out of 2 people found this helpful
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5 out of 5

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.
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5 out of 5

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
3 out of 3 people found this helpful
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5 out of 5

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.
Was this review helpful?    Yes | No
 
3 out of 5

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.
3 out of 3 people found this helpful
Was this review helpful?    Yes | No
 
5 out of 5

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.

11 out of 13 people found this helpful
Was this review helpful?    Yes | No
 

Add accessories for the PAC C2R-GM11B Wiring Interface

Maintain your factory steering wheel controls through your compatible stereo. See all categories & accessories

PAC SWI-RC Steering Wheel Control Adapter Connects your car's steering wheel audio controls to select aftermarket car stereos
100 people say
Your Price: $69.99
Add to Cart
PAC SWI-CP5 Steering Wheel Control Adapter Connects your car's steering wheel audio controls to select aftermarket car stereos
Your Price: $89.99
Add to Cart

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For a more in-depth review and enhanced detailed information on the PAC C2R-GM11B Wiring Interface, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_1272RGM11B/PAC-C2R-GM11B-Wiring-Interface.html ).

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