PAC OS2-GM32 Wiring Interface

Retains OnStar®, Bose® amplifier, and warning chimes when replacing factory radio in select 1996-2005 Cadillac vehicles

Item #: 541OS2GM32

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4 Reviews

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This PAC OS2-GM32 interface allows you to connect your new radio to the existing wiring in your vehicle and keep your factory features working. You'll keep the features you've become accustomed to such as safety warning chimes, the Bose amplified audio system, Retained Accessory Power (RAP), and the OnStar® system. If you have a standard Bose system, you'll be able to fade from the front to rear speakers with your new car stereo; if you have the Premium Bose system, you'll lose that ability.

The steering wheel controls for OnStar will still work, but you'll need a steering wheel control adapter (sold separately) to connect your new stereo to the Cadillac's steering wheel controls. You'll also lose the factory XM receiver.

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

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.

PAC OS2-GM32 Wiring Interface Reviews

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Pain in the rear

Written By Cole, New york on Tuesday, March 24, 2015

Crutchfield Customer Review (What's this?)

Needed it for a 2003 deville and wanted to smash it into a million little pieces because it is so big I couldn't get it to fit the only place it could go . After hours of fighting with it I got lucky and just barely got the the unit to force into where it needed to go .

Pros: It works

Cons: Way to big for most applications

Works Perfectly

Written By MacW., California on Friday, December 12, 2014

Crutchfield Customer Review (What's this?)

It works perfectly there's nothing else to say.

Pros: Works Fantastic

Cons: None


Written By Jay, Ramsey, Mn on Tuesday, August 26, 2014

Crutchfield Customer Review (What's this?)

Works great

Pros: Easy hookup

Cons: None

pac os2-gm32 factory Inf

Written By blast, Bangor, ME on Wednesday, August 13, 2014

Crutchfield Customer Review (What's this?)

Do not order this unless you are an expert at soldering wires together. I did not know this would need to be done when I ordered the product I am totally dissatisfied with this item and would not recommend it at all.

Pros: There are no Pros for this Item.

Cons: You have to cut all the wires off of your other connectors and color those wires to the wires for all the plugins that come with this unit. Then strip both colored wires solder them together then warp with black electrician tape and you have to do this for all your speakers and every other unit you have to connect to. If you are no good at soldering then you are asking for a lot of short circuits down the road and it will be pure misery trying to find them!

Hands-on research

What's in the box?

Download owner's manual

  • Radio replacement interface module
  • Chime module (CM1)
  • Vehicle harness
  • Radio harness
  • Installation Instructions
  • Chime Instructions

Product Research


Radio Replacement Interface: The PAC OS2-GM32 radio replacement interface allows your to replace the factory stereo in select Cadillac vehicles with an aftermarket head unit and maintain operation factory features such as OnStar, Bose amplifier, RAP, and warning chimes.

Vehicle Compatibility: The PAC OS2-GM32 is compatible with select 1996-2005 Cadillac Deville, Eldorado, Seville vehicles with GM Class II data-bus system and 32-pin connector (with or without OnStar, and with or without Bose)

Note: As always, please consult Crutchfield's Outfit My Car to see if your vehicle is compatible. Click here for the latest vehicle compatibility chart from PAC.

Retained Features: The PAC OS2-GM32 radio replacement interface retains the following factory features of your vehicle.

  • OnStar: The OS2-GM32 retains your vehicle's factory OnStar system. It allows audio from the OnStar system to play through the vehicle's two front speakers when OnStar is active, and mutes the output of your new aftermarket radio. OnStar volume control can still be done through your factory steering wheel controls.
  • Bose Amplifier: The PAC radio replacement interface lets you retain your vehicle's factory Bose amplifier. Standard Bose amplifiers will continue to fade front to rear. Due to the design of Premium Bose amplifier systems, there is currently no way of fading from front to rear with an aftermarket radio.
  • Accessory Turn-On Wire: The OS2-GM32 provides a +12V switched accessory output; no more searching for switched +12-volts in the fuse box or kick panel.
  • RAP: Your aftermarket head unit will continue to operate with the vehicle's RAP (Retained Accessory Power) system. The aftermarket radio will stay on after the vehicle's key is turned off and then stays on for approximately 10 minutes or until a door is opened.
  • Warning Chimes: The vehicle's factory warning & parking assist chimes are also fully retained. External chime module included.
Note: The OS2-GM32 does not retain the factory XM Satellite Radio receiver; you will lose this option when the factory radio is replaced with an aftermarket stereo.

Wiring Connection Chart: The included harness features the following wires which will need to be hardwired (solder or crimped) to your aftermarket head unit's wiring harness.

Wire Color Function
Red +12 Volt Accessory
Yellow +12 Volt Constant
Black Ground
Blue Power Antenna
Blue/White Amp Turn On
Orange 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 -
Purple Right Rear Speaker +
Purple/Black Right Rear Speaker -
Brown Loop Mute
Note: Installation tools, hardware, & accessories are not included & sold separately.

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.

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