OS-5 - Car kit PAC - Free user manual and instructions

Product Type	Vehicle-specific installation kit for car audio
Brand	PAC
Model	OS-5
Compatibility	Select vehicles (check fit guide)
Main Function	Enables aftermarket radio installation
Wiring Harness	Plug-and-play adapter included
Antenna Adapter	May be included for some vehicles
Dimensions	Approx. 6 x 4 x 2 inches (varies by application)
Weight	Approx. 0.5 lbs
Power Requirements	Passive - no external power needed
Installation	Easy, no cutting of factory wiring required
Tools Required	Basic hand tools (screwdrivers, trim tools)
Safety	Disconnect battery before installation
Maintenance	Wipe with dry cloth; avoid moisture
Spare Parts	Contact PAC customer service
Repairability	Non-repairable, replace if defective
Certifications	Meets automotive standards
Manual Languages	English (EN)

Frequently Asked Questions - OS-5 PAC

How do I know if the OS-5 fits my vehicle?

Check the fit guide on PAC's website or the product packaging. You need your vehicle's make, model, and year.

What is included in the box?

The kit includes a wiring harness adapter, possibly an antenna adapter, and installation instructions. Confirm with the manual.

Do I need to cut any wires?

No, the OS-5 is designed for plug-and-play installation. No cutting of factory wiring is required.

Can I use this with a factory amplifier?

The kit may include adapters to retain factory amplifier integration. Check the specific vehicle application.

What tools are needed for installation?

You'll need basic hand tools like screwdrivers, trim removal tools, and possibly a socket set.

Is the antenna adapter included?

Some versions include an antenna adapter. Verify on the product page or manual for your specific vehicle.

How do I connect steering wheel controls?

If your vehicle has steering wheel controls, you may need a separate SWC interface. The OS-5 kit does not include one.

Does this kit support backup camera integration?

The OS-5 is primarily a radio installation kit. Backup camera retention often requires additional modules.

What should I do if the kit doesn't fit?

Double-check vehicle compatibility. If still issues, contact PAC support with your vehicle details.

How to contact PAC support?

Visit PAC's website at www.pac-audio.com or call their technical support line. See the manual for specific contact info.

USER MANUAL OS-5 PAC

Introduction and Features

The OS-5 interface allows the replacement of a factory radio in select General Motors vehicles with 29 Bit Data-Bus. Using this interface will retain factory features such as Warning Chimes, Bose Amplifier, Rear Seat Entertainment (RSE), and Rear Seat Controls (RSC) when the original radio is removed. The OS-5 provides data bus driven outputs such as retained accessory power (RAP), vehicle speed signal (VSS), illumination, reverse trigger and parking brake.

Important Notes

1. Aftermarket radio must have an auxiliary input in order to retain RSE audio.
2. If the vehicle chimes when the radio is removed, the CMX is not necessary. In order to get the best possible sound out of the CMX, please mount it in a place free and clear of any obstructions, preferably as close as possible to the bottom of the dash pointing down toward the floor of the vehicle.

Module Layout

Installation Steps

1. Wire your aftermarket radio to the OS-5's harness according to the wiring connections chart below.
2. The Brown mute loop in Interface Connector 4 (if not cut) will turn the OS-5's accessory output off when any OnStar function is active. If the aftermarket radio has a mute input, cut this loop and connect the Brown wire in pin 23 to it. This pin is located in the top row next to the solid blue wire. (The top of the connector has the locking tab on it).
3. Plug Interface Connectors 1 and 2 into the appropriate ports on the OS-5 interface (using the diagram on Page 1 or the label on the bottom of the interface).
4. The Connector 3 connection will be dependent upon whether or not the vehicle has a factory amplified system. Plug this connector into the appropriate port on the OS-5 (using the diagram on Page 1 or the label on the bottom of the interface).
5. If the aftermarket radio is equipped with an auxiliary input and you wish to retain the factory RSE audio, you must use the part# GMRVD (Sold Separately).
6. Remove the factory radio and plug in the OS-5's Vehicle Connector 1 and Vehicle Connector 2 into the factory vehicle harness.
7. Plug the 2-Pin connector into the CMX Chime Module (If the vehicle chimes when the radio is removed, the CMX is not necessary). PLEASE NOTE: In order to get the best possible sound out of the CMX, please mount it in a place free and clear of any obstructions, preferably as close as possible to the bottom of the dash pointing down toward the floor of the vehicle.

Close-up of a black connector with yellow and red wires attached to a white connector on a textured gray surface (no text or symbols visible)

Interface Connector 1 (3-pin)

Close-up of a white connector with multiple colored wires against a dark textured background (no text or symbols visible)

Interface Connector 2 (20-pin)

Close-up of a white connector with green and purple wires against a textured gray background (no text or symbols visible)

Interface Connector 3 (12-pin)

Close-up of a white plastic electrical connector with multiple wires against a textured gray background (no text or symbols visible)

Interface Connector 4 (24-pin)

Close-up of a black rectangular electronic component with a thin wire, placed on a textured gray surface (no visible text or symbols)

Vehicle Connector 1 (14-pin)

Close-up of a black rectangular electronic component with a red light beam, placed on a textured gray surface (no visible text or symbols)

Vehicle Connector 2 (16-pin)

Close-up of a black CMX Smart module device with visible wiring and mounting holes (no text or symbols on body)

CMX Chime Module

Wiring Connections

Yellow 12v+
Red	Accessory Output (10 amp)
Black Ground
Brown Loop Mute Output
Blue Not Used
Blue / White Remote On Input
Orange Not Used
Orange / White Illumination Output
Purple / White Reverse Output (+)
Light Green Parking Brake Output (-)
Pink Vehicle Speed Signal (VSS) Output
Blue / Yellow	SWC Output / Key 1
Brown	SWC Output / Key 2
3.5 mm Jack	SWC Output
Purple	Rear R + input
Purple / Black	Rear R - input
Green	Rear L + input
Green / Black	Rear L - input
Gray	Front R + input
Gray / Black	Front R - input
White	Front L + input
White / Black	Front L - input

Programming Button and Adjustment Dial Functions

You can press and hold the programming button on the side of the interface to access different programming modes. Once the LED is lit to the mode you desire (see below for modes), immediately release the programming button to access that mode.

PLEASE NOTE:

- This process must be done with the interface in the vehicle and the key in the ignition position.

A. LED 1 flash red: Master reset. This does a master reset of the interface and restores the following settings to factory defaults:

• SWC Mapping
• SWC Calibration

SWI-DIRECT Steering Wheel Control Output Connector

If you are using the SWI-RC-1 or SWI-CP2 please follow the steps below.

Refer to the figure to the right to set the bank of eight Dip-Switches.

Refer to the guide below for setting the bank of four Dip-Switches based on your radios manufacturer.

Set DIP-Switches that correspond with your radio to the ON position. Set all other DIP-Switches to the OFF position.

Alpine	JVC	Kenwood / Lightning Audio	Stinger	Clarion / Nakamichi	All Other Brands	Pioneer	Sony	Fusion
1	2	1 & 2	3	3	1, 2, & 3	1, 2, & 3	4	1 & 4

If your brand is not listed above, please use “ALL OTHER BRANDS.”

Testing and Verification

1. Turn the ignition on. LED 1 will illuminate red and the +12v accessory wire will turn on.
2. Turn on the radio and check chimes, volume, balance, and fader.
3. In vehicles equipped with Premium Bose (Y91 / UQA): If the overall volume is too low, use the adjustment dial on the side of the interface to set it to the desired level. The best way to do this is to turn the volume on the radio to 3/4 volume, then turn the

adjustment dial on the OS-5 clockwise until some distortion is heard, then counter-clockwise a little.

1. To adjust OnStar volume, press the OnStar button on the mirror then use the volume buttons on the SWC, or the adjustment dial on the side of the module to adjust the level. When you hear a chime during this process it means you have reached the farthest minimum / maximum level.
2. Pressing the OnStar button on the rearview mirror will turn off the rear speakers and allow the OnStar audio to be heard in the two front speakers. The OnStar active LED will also turn on. When OnStar disconnects, the radio will un-mute or turn back on and the OnStar LED will turn off. Pressing the VR / OnStar button on the steering wheel will also activate OnStar.
3. Turn off vehicle and remove key. RAP will be active and keep the radio on for 10 minutes or until any door is opened.
4. The LED and radio will turn off when RAP turns off or until any door is opened.
5. Use the 4-position selector switch located on the side of the CMX chime module to select the best chime output volume for your specific installation. Setting 1 being loudest and 4 being softest.

graph TD
    A["CMX chime module"] --> B["Device 1"]
    A --> C["Device 2"]
    A --> D["Device 3"]

OnStar Volume Adjustment for Vehicles without SWC

1. When OnStar is active use the adjustment dial on the side of the module to raise or lower the OnStar volume to the desired level.

Rear Seat Entertainment (RSE); If equipped

1. Vehicles equipped with an overhead screen only:

In this application the GMRVD must be used in order to feed A/V into the factory screen from an aftermarket head unit (head unit must support A/V out). With the GMRVD, A/V will be passed from the aftermarket head unit to the rear screen and audio can be heard through the headphones. The GMRVD will also pass the Auxiliary inputs on the rear of the center console to the aftermarket head unit.

2. Vehicles equipped with an overhead screen AND headrest monitors:

In this application the headrest monitors will function independently from the overhead monitor. Neither video or audio can be passed to or from the headrest monitors. The overhead monitor will function exactly as described in #1.

RadioPRO PC App

Firmware Updates

The RadioPRO PC app will allow you to update the interface with new firmware as it becomes available.

Please visit https://pac-audio.com/firmware-updates/ for available updates.

Connect the interface to your PC and select "Firmware", then "Update Firmware". Now select "Select File". Finally, browse to the place where you saved the file and select it. This will begin the updating process. Once finished, disconnect the interface from the PC and test operation.

Technical Support

Email: [e-mail]

Toll Free: 866-931-8021

Standard / International: 727-592-5991