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PAC OS-311B Wiring Interface

Connect a new car stereo and retain OnStar®, RAP, and safety warning chimes in select 2004-up Chevrolet and Pontiac vehicles

Item # 127OS311B

PAC's OS-311B wiring interface lets you replace the factory radio in select 2004-up Chevrolet and Pontiac...

Find what Fits your car

PAC's OS-311B wiring interface lets you replace the factory radio in select 2004-up Chevrolet and Pontiac...

Item # 127OS311B

In stock
C$194.99

About the PAC OS-311B Wiring Interface

PAC's OS-311B wiring interface lets you replace the factory radio in select 2004-up Chevrolet and Pontiac vehicles, without losing the audible warning tones, turn signal indicators, and OnStar® functions. Warranty: 1 year.

PAC's OS-311B wiring interface lets you replace the factory radio in select 2004-up Chevrolet and Pontiac vehicles, without losing the audible warning tones, turn signal indicators, and OnStar® functions. Warranty: 1 year.

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

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What's in the box:

  • OS-311b GM/OnStar interface
  • CM-X chime module
  • 6" GM-antenna adapter
  • OS-LAN24b OEM adapter harness
  • OS-3RAD radio interface harness with in-line relay
  • Installation Instructions
MFR #OS-311B

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PAC OS-311B Wiring Interface reviews

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Crutchfield response

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More details on the PAC OS-311B Wiring Interface

Stacey B.

Product Research

Features

Overview: The PAC OS-311b Radio Replacement Interface allows easy connection of an aftermarket stereo in select General Motors vehicles equipped with OnStar; please see "Outfit My Car" to confirm compatibility. The interface will maintain operation of the vehicle's OnStar system and speakers. The OS-311b has on-board switching to allow audio from the OnStar system to play through the two front speakers when OnStar is active. This interface also retains all warning chimes and the audible turn signal indicators.

Note: The OS-311b interface does not retain the factory XM receiver. You will lose the XM option when the factory radio is replaced with an aftermarket head unit.

Smart Mute Circuitry: The unit's built-in Smart Mute Circuitry will mute the radio and play OnStar through your vehicle's front speakers.

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

RAP System Compatible: The interface supplies your new radio with a 12 volt switched power, and allows your aftermarket radio to operate with your vehicle's RAP (Retained Accessory Power) system. The radio will stay on after the key is turned off and stays on for approximately 10 minutes or until the drivers door is opened.

Dimensions:

  • OS-311b Interface:
    • Width: 6.712" (with cables)
    • Height: 1.075"
    • Depth: 2.026"
  • CM-X Chime Module:
    • Width: 2.144" (with cables)
    • Height: 1.037"
    • Depth: 1.534"

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
Only wiring harness for my car [ Kevin  Feb 11, 2019 ]
A
I needed it. [ ceecee  Aug 06, 2018 ]
A
There were no magical reasons why I chose the PAC OS-311B Wiring Interface. It was simply the least expensive installation package that was offered. It appeared to offer essentially the same things as the more expensive packages except for steering wheel controls, which I didn't need. [ Kevin  Jan 02, 2017 ]
A
Needed this to install double din receiver in my 05 Cobalt SS [ Ethan  Jun 05, 2016 ]

2 questions already asked

Q
I have a 06 Pontiac G6 GTP and I want to know if this harness is really required to install an aftermarket radio and subwoofer? I do not care about retaining on star.
[ Mouhammad  Jun 22, 2015 ]
1 answer
A
For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.
[ Krissy  Jun 22, 2015 ]  Staff

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