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PAC RP4-GM31 Factory Integration Adapter

Connect a new car stereo and retain steering wheel controls, safety warning chimes, rear seat video, and Bose® amp in select 2006-up GM vehicles

35 Reviews | 2 questions - 5 answers

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Our take on the PAC RP4-GM31 Factory Integration Adapter

PAC's RP4-GM31 radio replacement interface lets you replace the factory radio in select 2006-up General Motors vehicles, and still retain your factory warning chimes, and your steering wheel audio controls. With an additional adapter, you can also keep your rear seat entertainment system and rear seat controls. The interface also works with GM's Bose® system, tying your new car stereo into the factory amplifier.

PAC's RP4-GM31 radio replacement interface lets you replace the factory radio in select 2006-up General Motors vehicles, and still retain your factory warning chimes, and your steering wheel audio controls. With an additional adapter, you can also keep your rear seat entertainment system and rear seat controls. The interface also works with GM's Bose® system, tying your new car stereo into the factory amplifier.

Another plus — the RP4-GM31 adapter eliminates the need for the steering wheel audio control adapter that's usually required for your vehicle, saving you some cash. See Details for a list of compatible car stereos. Warranty: 1 year.

Please enter your vehicle information or call an Advisor at 1-888-955-6000 to find out if this adapter is compatible with your vehicle.

Important Note: This interface does not retain your vehicle's OnStar functionality. You'll need PAC's OS-4 interface to keep that safety feature working with a new car stereo.

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.

Great interface, it hooked up directly to my car harness. (2008 Buick Lucerne)

D-Bone22, Suitland, MD

What's in the Box:

  • Radio replacement/SWC interface module (for GM LAN 29-bit data-bus)
  • RAD-GMLAN2 wiring harness
  • 12" Steering wheel control harness (4-pin connector to 3.5mm/blue wire)
  • Instructions

PAC RP4-GM31 Factory Integration Adapter Reviews

Average Customer Review(s):

(35 Reviews)

Good Inegration Adapter

D-Bone22 from Suitland, MD on 6/26/2014

2008 Buick Lucerne
Crutchfield Customer Review (What's this?)

Great interface, it hooked up directly to my car harness. (2008 Buick Lucerne)

Pros: Easy hook up, long wires, interface isn't too big so its easy to hide.

Cons: Had to program it to use my Steering wheel controls. Took longer than the install of the interface and after market radio. The instructions wasn't clear, they should had pictures or just redue the directions.

Works perfectly

Anonymous from Fairmount, IN on 5/14/2014

2007 Chevrolet Silverado (New Body Style
Crutchfield Customer Review (What's this?)

Product worked as described. Retained all my steering controls.

Pros: Worked without a problem. Crutchfield was great to work with.

Cons: None

not sure

webber from Rochester, MI on 4/23/2014

2006 Chevrolet Impala
Crutchfield Customer Review (What's this?)

Didnt work my system




Stephen from Simpsonville, SC on 4/11/2014

2010 Chevrolet Tahoe
Crutchfield Customer Review (What's this?)

Works perfect - At first i was worried about all the wiring but this was almost plug n play.

Pros: Easy install - works as it should

Cons: None


Mark from Highland, MI on 4/10/2014

2007 Chevrolet Impala
Crutchfield Customer Review (What's this?)

Easy to install, had some static background noise when radio was off - fantastic Crutchfield support sent out some ground loop/noise suppressors for the speaker inputs right away and that solved the problem.

Pros: Easy to install. Retains the expected OEM features - steering wheel controls and warning chimes etc.

Cons: OEM turn signal is a kind of "tick" noise. This box provides more of a "blip" noise - not a big con, just something I didn't expect...

PAC RP4-GM31 Factory Integration Adapter

Shawn coe from Kirkville on 4/9/2014

Crutchfield Customer Review (What's this?)

Very easy to install and tech are very helpfull

Pros: Hooks right up to your vehicle

Cons: Little high in price

Not as complicated as I thought

Rmags from Rocky River,OH on 3/30/2014

2011 GMC Savana
Crutchfield Customer Review (What's this?)

I had a problem with my radio interface, and Crutchfield tech support suggested I replace it with this one. I didn't relish the idea of hours on end trying to figure and configure the new unit. This was pretty much a plug and play. I haven't fully tested it yet, but it seems to be fine.

Pros: Smaller than the GMOS-100 that I originally installed.

Cons: none yet

Factory integration adapter

Anonymous from Ellwood City, PA. on 3/22/2014

Crutchfield Customer Review (What's this?)

This was super easy to install. I have been out of car audio for a while and decided to install this on my own. No issues at all ....

Pros: Excellent product Easy installation

Cons: None


david from perryton tx on 3/12/2014

Crutchfield Customer Review (What's this?)

hooked up on an 07 Tahoe with bose very easy to hook up, and works great, the chimes are just the right volume not to loud to make them annoying and not to soft that you cant hear them, steering wheel controls work great, every thing works just ass good if not better than factory

Pros: easy hook up, does exactly what its supposed to do



red from texas on 2/24/2014

2008 GMC Yukon
Crutchfield Customer Review (What's this?)

Simple to hook up and works just as described.

Pros: None

Cons: Easy to use

Does exactly what it says!

Gmc4llife from Shannon,Ms on 2/6/2014

Crutchfield Customer Review (What's this?)

Good product. Love the tech support. It retains factory controls.

Pros: Works as it said it wood

Cons: Chimes are not loud as I would like

Worked perfect!

Omie from Manteo NC on 1/12/2014

Crutchfield Customer Review (What's this?)

Great product, works just as advertised!! Don't forget the onstar as well.

Pros: Plug and play install

Cons: None


SUMBUDDIE from Lucerne, Lake County, California on 1/2/2014

2008 Chevrolet Avalanche
Crutchfield Customer Review (What's this?)

I had a professional install done, it only cost $65 to put the Kenwood CD player into the Avalanche and also put the GM factory integration adaptor box into the factory wire harness so the steering wheel buttons and paddles worked the radio. I unplugged the Sirus On Star as that is useless and expensive especially with the Kenwood though it does run that if you like with the purchase of an adaptor box. GM can start my truck, open doors and even roll down windows or GPS me, well so can hackers, and GM can also stop my truck/car with a push of a button ... unplugging the roof antenna suited my fancy. The steering wheel controls all work, most of them the same as before, some slightly differently but in a good way. I purchased the DPX300U as I just wanted to use the ipod that this keeps charged up and did not want bluetooth or cell phone or any other redundant features of the more expensive DPX500BT. If you are upgrading your car or truck also get the factory speakers replaced (the four bigger ones) as the factory ones can not even handle the factory GM radio/CD player. The Kenwood puts down a rather clean audio signal but it pushes the speakers a bit harder.

Pros: I think it works the controls better now, though what the factory had them set to was slightly different. Volume up and down is the same. Channel advance up and down is now search up and down. Source is still source. Search button is now band switch so that FM 1 and FM 2 and FM 3 for storage of memory stations comes up. To use the memory station, I have to hit the big buttons the Kenwood dash ... not the steering wheel paddle. Also mute button is still mute.

Cons: No down side to the GM package to my reckoning ... all the steering wheel controls work and I think better then what they were. Or at least to my driving needs. The Radio Antenna is factory and they have a factory adaptor free for you, to upgrade the antenna if you can not go in or on the window, going to another aftermarket antenna is expensive to install. The factory antenna has three bolt holes to hold the antenna on and one wire hole making upgrade install about 3 hours of body work.


Richie from Monroe,la on 12/30/2013

Crutchfield Customer Review (What's this?)

Not very loud chime, which is ok but could be louder or adjustable.

Pros: Everything worked.

Cons: Diagram could be better.

Great product Works almost perfect

DH from Philadelphia, pa on 12/27/2013

Crutchfield Customer Review (What's this?)

Great adapter from pac, Installed in a 2007 Cadillac Escalade and it works almost flawlessly with one catch the Factory Amp turn on doesn't always work at first boot but after a radio power cycle it works fine. This adapter Retains all my OEM features minus the onstar but it works perfectly other wise the steering wheel controls are perfect and I didn't need to program them.

Pros: Retains all my OEM features minus the onstar but it works perfectly other wise the steering wheel controls are perfect and I didn't need to program them.

Cons: Factory Amp turn on doesn't always work at first boot but after a radio power cycle it works fine.

PAC Integration Adapter

Doc from Charlotte, NC on 11/26/2013

Crutchfield Customer Review (What's this?)

This is used to integrate with the factory Bose system in '07 and up Chevy Tahoe, Suburban, etc. it is fairly simple for those that have a fair amount of electronics knowledge, if you get in a jam all you have to do is call Crutchfield, you will not only get someone fairly quickly to actually get on the line with you, but you will get someone that knows EXACTLY how to help you out, they know the products they sell, they know the vehicles you are putting them in, its incredible to say the least.

Pros: Works perfectly with aftermarket head unit (Alpine)

Cons: none

Not loud enough.

CorbyH from Fairbank IA on 11/3/2013

Crutchfield Customer Review (What's this?)

This item works well once you get it installed and programmed. It replaces the factory chime and is very quiet. Once I had it installed I had to disassemble the dash again and mount the programming box under the dash so I could hear it better. The directions could be a little more detailed.

Pros: Does exactly what it says it does.

Cons: Chime is quiet. Directions difficult to follow.

PAC RP4-GM31 Factory Integration Adapter

Brad in Virginia ,9/30/2013 from Southwest,VA on 9/30/2013

Crutchfield Customer Review (What's this?)

Easy to hook up. Works well in 2012 Impala with Kenwood radio. All functions still work on steering wheel.

Pros: Easy install.Keeps all factory functions.


Does not work on soundstream

RG from Jax, FL on 9/25/2013

2008 Suzuki XL-7
Crutchfield Customer Review (What's this?)

Product does not work. SWC buttons activate the led on adapror but any and all configurations do not let the SWC work The LED does not blink or respond like the instructions imply. I even called tech assist and nothing. Going to return for possible exchange with the axxess brand. Hopefully this works.



Work like it should

John from Riverside Rhode Island on 9/10/2013

2013 Chevrolet Silverado 1500
Crutchfield Customer Review (What's this?)

Easy. to install and works like advertised. I suggest wiring the unit to your stereo on the bench the day before you expect to install it so you are not in a rush to get it done. Instructions might be a little confusing to understand.

Pros: Work as advertised

Cons: Cost, I could have bought a more expensive stereo if this was not needed.

Very Functional; once working.

mabe75 from Ridgeway VA on 8/12/2013

Had some issues with making this unit operational. The manual isn't very good, however I was able to figure it out fairly easily. As stated by a previous review, don't over think it. But even after wiring the unit still didn't work correctly. Called the Crutchfield tech support and they had tips on resetting the device that worked correctly. This wasn't in the manual. After several resets, it worked correctly and still is.

Pros: Does it's job

Cons: Bad Manual/Install Instructions


Silverado from Las Vegas, NV on 8/10/2013

Crutchfield Customer Review (What's this?)

I have an electrical background and I still can't get it to work with my steering wheel control. It plays the deck and everything else works. But I spent more money to make my steering wheel controls work and it doesn't.

Pros: None

Cons: Still isn't working with my steering wheel controls. Wiring diagram isn't clear on what goes where.

Crutchfield response on 8/12/2013 We forwarded this review to our Technical Support team for follow-up. Lifetime tech support comes with every Crutchfield purchase.


Gerry from Anacortes WA on 8/9/2013

2008 GMC Sierra
Crutchfield Customer Review (What's this?)

Easy to plug in but many extra wires and no expiation of where they go. Many calls to tec finally got all working

Pros: Works

Cons: Need a better wiring digram

Decent Unit

RyanW from Minneapolis, MN on 8/2/2013

2012 Chevrolet Suburban
Crutchfield Customer Review (What's this?)

The wiring and hook up is pretty straight forward. May be a little time consuming for some but it calls out very clearly what you need to do.

Pros: Easy to follow instructions on wiring and hooking up. Anything you have questions, Crutchfield tech support was great. (as I had a few wires that did not need to be hooked up) If you need to program, it is pretty easy

Cons: The only thing I did not like is I have to program all my steering wheel controls, on star, etc...I set it to the correct setting for my pioneer before I even installed it in my car. I worked with Crutchfield to troubleshoot and at the end, I had to program the steering wheel controls. Only reason why I find this a CON as I had to pull the unit out to get to the module, and it is such a tight spot for all the wires, it is just a pain to pull it out and put in back in with all the wires.

Easy Intall

Grant from Wisconsin on 7/26/2013

2013 Chevrolet Silverado 2500/3500
Crutchfield Customer Review (What's this?)

this adapter was so easy to wire in, only took a few minutes and I am far from a pro. Door chimes, blinker and steering wheel controls still work great!! Good product, Good buy!



Tricky at first

Todd from Pittsburgh, PA on 7/23/2013

2012 Chevrolet Traverse
Crutchfield Customer Review (What's this?)

At first, I was a little overwhelmed, but I was definitely overthinking the install. If I were to do it again, it would take me 1/4 the time.

Pros: Works as it should

Cons: Can barely hear the chimes now.

PAC RP4-GM31 Factory Integration Adapter

Big Mike from Fort Lauderdale, FL 33311 on 5/31/2013

Crutchfield Customer Review (What's this?)

This steering wheel adaptor was very easy to install, & program. It performed as advertised.

Pros: Easy install.

Cons: N/A

Good, but not great

Collin B from Connecticut on 5/30/2013

2012 Chevrolet Silverado 1500
Crutchfield Customer Review (What's this?)

It is useful overall and I am very happy with the product. Generally easy to install, instructions are relatively clear and it does what it is supposed to do.

Pros: -Easy to wire -Kept factory sounds with aftermarket head unit

Cons: -Difficult to turn the selector arrow without stripping due to poor quality, but did make it work -While its pretty small, it was difficult to fit into the space behind the dash. I did make it work. -While it wasn't too bad to wire, there are a lot of excess wires, which could be confusing. Took some brainpower to figure it out.

2008 Vue stereo adaptor

mark m from pecos, nm on 5/21/2013

2008 Saturn VUE
Crutchfield Customer Review (What's this?)

Great product. Easy to install. All my accessories work including steering wheel controls.

Pros: Ease of installation

Cons: None

Wotrks as it sould

agallant80 from NC on 5/3/2013

Crutchfield Customer Review (What's this?)

Hard to get excited about an adapter but this one does what it should. I had to call support to figure out how to connect my radio to it, if you don't have the factory amp then you must cut the RCA ends off and splice your spearer out from your amp or head unit in to there the RCAs were. Only real complaint is there is a dial that you set to your head unit brand, its really soft plastic, I stripped out the screw driver slot trying to click it over.

Pros: Does what it should

Cons: Soft plastic on the dial where you select what head unit you have. Also the noise your dirctional makes with this is kinda strange and its not very loud.


Anonymous from Millville nj on 4/18/2013

Crutchfield Customer Review (What's this?)

Very simple to connect works perfectly

Pros: Price

Cons: None

needed more info

drg from Fullerton,CA on 3/28/2013

Crutchfield Customer Review (What's this?)

came with rca plugs for speakers that plugged into radio pre-amp outlet, I have no amp, after determining problem had to cut plugs off and connect to speaker wires out from radio. also setting steering wheel control - learnig how to skip functios. very sparse instructions I'm a electro hydraulic mechanic and my son is system and network admin.

Pros: does the job

Cons: could be a lot more helpful with better instuction

Great integration Device

JeffP from Poquoson, VA on 1/31/2013

Crutchfield Customer Review (What's this?)

This device is great. Its unfortunate that such a device is necessary these days, but it performs admirably. All my irritating factory bells, dings, and warnings still come through as advertised. Steering Wheel controls work perfectly. Wiring was very easy with the Crutchfield mastersheet and a bit of phone support. The only thing I do not like is the turn signal sound. The factory had a lond click, this is more of a digital beep. Neither is pleasant, but the beep is a bit low in volume. Overall not a large issue. but its the only downside I have found yet. I really like this product. I bought it instead of the cheaper ones so I could add all the available features in the future.

Pros: Steering wheel controls work well. Relatively easy to install. Keeps factory safety features

Cons: turn signal beep is a bit too quiet and odd choice of sound. Not at all a serious issue.

PAC rp4-gm31

Anonymous from Lewiston,me on 1/30/2013

2009 GMC Sierra
Crutchfield Customer Review (What's this?)



Cons: Wish the Bluetooth buttons would work on my truck to hang up hands free... Also the blinker noise is annoying but it's worth it

PAC RP4-GM31 Factory Integration Adapter

Anonymous from biloxi, ms on 11/7/2012

2010 Chevrolet Traverse
Crutchfield Customer Review (What's this?)

The adapter integrated well into my new pioneer head unit. Steering wheel controls work well. Only downside so far is that the unit was supposed to let me keep my warning chimes, but the sound does not play through the speakers. May be a faulty unit...Crutchfield is sending a new one one to try out.




Hands-on research

Product Research


Overview: The RadioPro4 (RP4-GM31) is a radio replacement and SWC (steering wheel control) interface that comes pre-loaded with amplifier retention and SWC software, navigation based output signals, and firmware that retains all of the vehicle's original safety and convenience features when replacing the factory radio with an aftermarket head unit.

Functionality: The RP4-GM31 interface allows the replacement of a factory radio in select GM vehicles with the CAN-bus system. Using this interface will retain factory features such as steering wheel controls (SWC), rear seat entertainment (RSE), rear seat control (RSC), the factory Bose amplifier, and Warning Chimes whenever the original radio is removed. In order to retain rear seat entertainment (RSE), you will also need the PAC GMRVD GM Rear Seat Video Retention Adapter (127GMRVD, sold separately). The RP4-GM31 also provides data bus driven outputs such as retained accessory power (RAP), vehicle speed sensor (VSS), illumination, reverse trigger, and parking brake.

Note: The RadioPro4 (RP4-GM31) does not retain OnStar. For OnStar retention, please use the PAC OS-4 (127OS4, sold separately). If your vehicle is equipped with a digital amplifier, you will lose fading capabilities when the new aftermarket radio is installed.

Vehicle Compatibility: The RadioPro4 (RP4-GM31) is compatible with select 2006-up GM vehicles with  databus radios. Compatible vehicles as of 7/13/2012 include:

Make Model Year
Buick Enclave 2008-2011
Lucerne 2006-2011
Cadilac DTS 2006-2011
Escalade 2007-2012
SRX 2007-2009
Chevrolet Avalanche 2008-2012
Equinox 2007-2008
Express 2008-2011
Impala 2007-2012
Monte Carlo 2006-2007
Silverado 2007-2012
Suburban 2007-2012
Tahoe 2007-2012
Traverse 2009-2012
GMC Acadia 2007-2012
Savana 2008-2011
Sierra 2007-2012
Yukon 2007-2012
Hummer H2 2008-2009
Pontiac Torrent 2007-2009
Saturn Outlook 2007-2009
Vue 2008-2009
Suzuki XL-7 2007-2008

Vehicle Specific Notes: 2012 Avalanche, Sierra, Silverado, Suburban, Tahoe, and Yukon vehicles equipped with a navigation radio are not compatible. Chevrolet Express vans & GMC Savannah vans equipped with diesel engines are not compatible.

Note: Please consult Crutchfield's Outfit My Car to see if your vehicle is compatible. Visit for the most up to date information.

Radio Select Switch: The radio select rotary switch on the side of the interface must be adjusted to the proper radio setting before plugging the interface into the vehicle.

# Dial Radio Manufacture
1 Alpine
3 Kenwood
4 Clarion
5 Valor
7 Dual, Pioneer, Sony
8 Blaupunkt

Wiring Connection Chart: The included wiring harness features the following hardwire connections.

Wire Color Function
Red +12 Volt Accessory
Yellow +12 Volt Constant
Black Ground
Blue Power Antenna
Blue/White Amp Turn On
Orange/White Illumination
White Left Front Speaker +
White/Black Left Front Speaker -
Gray Right Front Speaker +
Gray/Black Right Front Speaker -
Green Left Rear Speaker +
Green/Black Left Rear Speaker -
Violet Right Rear Speaker +
Violet/Black Right Rear Speaker -
Red/White Parking Brake Detection (-)
Purple/White VSS Output
Green Reverse Output (+)

SWC Compatible: The interface comes pre-programmed for all of the vehicle's factory SWC functions and does not require programming, unless you wish to re-assign the SWC functions to different buttons. The SWC functions can be easily programmed; see control settings and functions below.  The interface retains programming even if your vehicle's battery is disconnected.

Switch Position 1 2 3 4 5 7
Radio Alpine JVC Kenwood Clarion Valor Dual Pioneer Sony
Control Functions Volume +/- Volume +/- Volume +/- Volume +/- Volume +/- Volume +/- Volume +/- Volume +/-
Mute Mute Mute Mute Mute Mute Mute Mute
Source Source Source Source Source Source Source Source
Preset +/- Track +/- Play Search +/- Track +/- Preset +/- Preset +/- Preset +/-
Track +/- Band/Disc + Track +/- Band Cursor up/down Track +/- Track +/- Track +/-
Power Preset/Disc - Disc/FM + Send OK Band Band Band
Play/Enter Select Disc/AM - End *** *** Phone Menu ***
Band/Program Attenuation Answer *** *** *** Answer Call ***
Receive (phone) Phone Receive/Reject *** *** *** *** End Call ***
End Voice Dial *** *** *** *** Voice Activation ***
*** Power *** *** *** *** *** ***
Note: The SWC harness contains a Blue/Yellow wire and a 3.5mm connector. You will only use one of the connectors, based on your type of aftermarket radio. The Blue/Yellow wire supports Kenwood, Newer JVC, OEM and Blaupunkt radios. The 3.5mm jack supports Alpine, Older JVC, Clarion, Pioneer, Sony, Valor, and Dual radios. Not compatible with Soundstream head units.

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.

Q & A

Customer Q&A

2 questions already asked

You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility. 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. [ Krissy  Apr 15, 2014 ]  Staff
Yes there is, to get the door charm I had to install a speaker specifically for the chime and onstar. To adjust the volume of the charm remove the head unit and the volume acceptance knob is on the back right. To verify before removal what head unit and vehicle is this instaled in? [ JAMES  Jan 10, 2014 ]
No I don't think you can do either. [ ZACHARY  Jan 09, 2014 ]
I taped a piece of cardboard on the chime to achieve a slightly lower volume. Had to experiment a little but eventually got my desired volume. Piece is hidden so I didn't worry about how it looks. 07 NBS Silverado Crew Cab [ RICK E  Jan 09, 2014 ]
Yes, With this adapter there is an option for chime volume adjustment. [ MICHAEL  Jan 08, 2014 ]