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PAC OS-4

Radio Replacement Interface for Select GM Vehicles with OnStar, GM-LAN Data-bus, and with/without Bose

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List price $219.95

$113.99

with warranty

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Arrives by Tuesday, Apr. 22 to zip 07095

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The PAC-OS4 is a plug and play interface that all for the replacement of a GM GMLAN Factory radio. It maintains the operation of OnStar in vehicles with Bose sound systems, amplified audio systems, and also audio systems without an external amplifier. The OS-4 has on-board switching that allows audio from the OnStar system to play through the two front factory speakers. This interface retains all factory warning chimes, audible turn signal indicators, factory XM Radio, and rear parking assist system. This is an all-in-one interface that eliminates the needed for multiple harnesses in specific GM LAN Vehicles.

  • Replacement interface for select GM Vehicles with OnStar, Bose, and GM LAN Data Bus
  • Compatible with or without factory amplified audio system
  • Can be used if the vehicle does not have OnStar
  • Compatible with or without Bose systems
  • Provides 12 Volt RAP Output wire
  • Retains the 5.1 Digital audio system in select GM Vehicles
  • Adjustable OnStar volume using the factory steering wheel controls
  • Factory XM Retention (vehicles with rear seat controls)
  • Retains factory rear park assist sensor system
  • Provides a direct plug and play in to any PAC SWI Interface
  • Retains factory Bluetooth (features and functions)
  • Latest version installed
  • 1-year Manufacturer's warranty
  • Check the General Installation Manual to see basic instructions for the PAC OS-4
Compatible with the following GM Vehicles:
  • Chevrolet:
    • 2007 - 2009 Tahoe
    • 2007 - 2009 Suburban
    • 2007 - 2009 Avalanche
    • 2007 - 2009 Silverado (Non-Classic)
    • 2006 - 2009 Impala
    • 2006 - 2007 Monte Carlo
    • 2007 - 2008 Express
    • 2007 - 2008 Equinox
  • GMC:
    • 2007 - 2009 Yukon Denali
    • 2007 - 2009 Sierra (Non-Classic)
    • 2007 - 2009 Acadia
  • Cadillac:
    • 2007 - 2009 Escalade / ESV / EXT
    • 2007 - 2009 SRX
    • 2007 - 2009 DTS

Product History:

PAC OS-4 thumbnail
(newest, current model)
PAC OS-3 thumbnail
(previous model, replaced by PAC OS-4)
iSimple GMAHLAN thumbnail
(previous model, replaced by PAC OS-3)

Compatible Vehicle Makes

Compatible Vehicle Make
Allows you to view only items that are compatible with your vehicle's make. Does not guarantee that it will work with your vehicle year or model.
Buick
Cadillac
Chevrolet
GMC

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
62%
4 Star
23%
3 Star
15%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.8
Value
4.8
Features
4.7
Design
5.0
Usability
4.8

Robert

Canada

Overall
Durability
Value
Features
Design
Usability

2008 sierra

March 30, 2014

installed a pioneer 850 bt nav unit into a 2008 sierra truck Pro, Really like the convenience wires that have the parking brake, speed wire and switched reverse power for the rear view camera! easy to hook up but make sure you have the many plugs in real tight! Cons, I hate the sound of the signal light I guess this is necessary? ...it's embarrassing. at least you cant hear it when the music is loud!

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denarris

columbus, OH

Overall
Durability
Value
Features
Design
Usability

oac os-4

March 18, 2014

Works great love it No problems at all Easy to install

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RazzleSnazzle

Minneapolis MN

Overall
Durability
Value
Features
Design
Usability

Way better than schoche or metra

May 20, 2013

Had a schoche one, it started making screeching noises and some times the head unit didn't turn on or shut off when it was suppose to. Although the PAC one has a pretty annoying turn signal noise.

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Brad

north olmsted, oh

Overall
Durability
Value
Features
Design
Usability

pac os-4

September 5, 2012

it works great, very easy to install. Its been in my 2011 gmc sierra for 6 months now with no problems... if i were to do it again, i wouldnt purchase this, the chime noise for it is beyond annoying and nothing like the stock sound!

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Greg

Savannah,Georgia

Overall
Durability
Value
Features
Design
Usability

great buy!

May 14, 2012

Great product works very well. Easy to install in my 2008 Silverado.

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Jake

Kansas City, MO

Overall
Durability
Value
Features
Design
Usability

Great value, works like a charm

October 24, 2011

I have a 2011 GMC Sierra and I had to get this product in order to have an aftermarket radio and keep my On Star and chimes and such. Overall great product!

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Jake

Kansas City, MO

Overall
Durability
Value
Features
Design
Usability

Great value, works like a charm

October 24, 2011

I have a 2011 GMC Sierra and I had to get this product in order to have an aftermarket radio and keep my On Star and chimes and such. Overall great product!

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Gary

Canada

Overall
Durability
Value
Features
Design
Usability

Good value

September 14, 2011

I had the PAC OS-4 installed by a professional. Everything worked as advertised, including OnStar. The only small drawback is the turn signal chime is too loud and quite annoying.

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Rodney

Havelock, NC

Overall
Durability
Value
Features
Design
Usability

Great Product

September 13, 2011

Works well in my wife's Cadillac DTS.

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tony big cat

mcallen tx

Overall
Durability
Value
Features
Design
Usability

easy to use no headache an great value

September 12, 2011

Saves time money on guessing the wires and great for the GMC Acadia and the bose system u will also need vrmd for the monitor in the back and comes pre wire for the steering wheel control and navi.

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Steven

Clinton Twp, MI

Overall
Durability
Value
Features
Design
Usability

Very Easy Install

August 9, 2011

I have a Saturn Vue 2008, and the PAC audio adapter and Steering Wheel controls worked very well to install this and my other radio. For my particular car, however, I was not able to retain factory XM radio functionality. The PAC provides 2 audio RCA plugs (L/R) for the XM, but I am unable to change the stations, so it just stays on the preview station for XM. I docked one feature point for that. The Onstar remains functional with this, just a simple mute wire going to whatever head unit you use. No splicing of factory wires. The turn signal chime on my Vue was occasionally not making sounds, but with this, the chime never failed. And, if you donít want alarm chimes, you can choose not to attach the chime unit. Iíd also recommend buying the PAC Steering Wheel adapter and not mixing with Axxess since this product has the exact plug to use with a PAC adapter so you donít have to splice additional wires. I tried with two radios, two different steering wheel adapters, and both worked well for their part. Iím back on the market for a different radio because I wasnít impressed with features of currently available models, but Iím definitely keeping the PAC adapter for whatever I decide to use.

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ALEJANDRO

MIAMI, FL

Overall
Durability
Value
Features
Design
Usability

excellent product - great value

March 14, 2011

it works very well, silverado 2010

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Ben

Anaheim, CA

Overall
Durability
Value
Features
Design
Usability

Love it!

December 1, 2010

If changing head unit this is a must have, have it in my 07 Yukon Denali & I retained everything, nothing was lost, Onstar, chimes, back up sensors, turn signals, XM, etc..

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Product Summary

Manufacturer

Model Number

OS-4

UPC

606523107778

Weight

0.50lbs

Internal SKU

os4

Internal Product ID

18009

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: PAC OS-4