by Crutchfield's Jon Paul

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.

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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.

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What's in the box:

PAC RP4-GM31 Factory Integration Adapter owner's manual

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

MFR #RP4-GM31

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Researched by Crutchfield's Stacey B.

Product Research

Features

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
Buick	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
Saturn	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 www.pac-audio.com 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
2	JVC
3	Kenwood
4	Clarion
5	Valor
6	OEM
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.

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2 questions already asked

I've got a 2012 Impala. With the crux interface I'm currently using I've lost the warning chime when I lock the doors using the lock button on the door. Any clue if this interface would restore that feature?

thomas f Apr 14, 2014

1 answer

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.

kristina Apr 15, 2014 (Staff)

Is there a way to adjust the warning chime volume with this or get rid of them completely?

justin Jan 07, 2014

4 answers

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.

mike Jan 08, 2014

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