PAC Audio OS-2X User Manual

OS-2X

CMX

chime module

Radio Replacement Interface with OnStar Retention for

General Motors Vehicles

Introduction & Features

The OS-2X interface allows the replacement of a factory radio in select General Motors vehicles with Class II radios.
Using this interface will retain factory features such as OnStar, warning chimes, Rear Seat Controls (RSC), Rear Seat

Entertainment (RSE) and the BOSE amplier when the original radio is removed. The OS-2X also provides data bus

driven outputs such as retained accessory power (RAP), vehicle speed sensor (VSS), illumination, reverse trigger and

parking brake.

Important Notes

1. The aftermarket radio must have an auxiliary input in order for the factory RSE audio to be retained through the cabin speakers.

2. RSC buttons that are identical to the SWC will mimic the SWC functon for function.

3. The interfaces accessory output is only rated at 10 amps. It is designed for the new aftermarket head unit ONLY.

4. For Bose systems, the recommended line level input is 2-4 volts from the aftermarket radio.

5. To prevent over driven audio when installing into a vehicle with a Bose system and the aftermarket radio does not have low level outputs
then an LOC (part # LP3-2) is recommended to match the input voltage or you can create an audio attenuation circuit (see diagram 2 below

for audio attenuation wiring).

6. To prevent ground loop or engine noise when installing aftermarket radios that use a common ground on the outer shield of the low level

outputs will require a ground loop isolator (part # LPGL-2)

Wiring Connection Chart

Yellow Battery +12v

Black Ground

Red Accessory Output

White Front L + input

White / Black Front L - input

Grey Front R + input

Grey / Black Front R - input

Green Rear L + input

Green / Black Rear L - input

Purple Rear R + input

Purple / Black Rear R - input

Illustration / Schematic

Aftermarket Radio Connections

Red / White Parking Brake

Output (-)

Purple / White Vehicle Speed

Output

Blue Not Used

Blue / White Amp Turn On Input

Orange / White Illumination Output

(+)

Green Reverse Output (+)

Brown Loop Mute Loop - See

installation note 5.

Wiring

RSE Audio Harness

OS-RADPWRAUDIO

Vehicle

Connections

Connect to SWC
Interface. Program
for Version 2.

Pacic Accessory Corporation® | Ontario, Ca. 91761 | Ph. 866-931-8021 | [e-mail]

©2014 Pacic Accessory Corporation

www.pac-audio.com

Aftermarket

Connections

SWI Connection

Radio

Rev. 050714

Page 1

OS-2X

Connect to SWC

Interface. Program

for Version 2.

Connect to Radio

Specific SWC

Interface

22

11 1

Level

Switch

blue

SPST N.O. switch (not included)

Connect to radio side 12 volt

constant wire

Blue wire

Wire insertion side view of

OS-5 RADPWRAUDIO

Connector

Radio Replacement Interface with OnStar Retention for

General Motors Vehicles

Installation Steps

1. Make all connections as described in the chart on page1.

2. Factory installed ampliers will determine the audio output connection. If the vehicle has a factory installed amplier use the
factory amplier audio location. If a factory installed amplier is not present use the non-amplied factory audio location.

3. If the vehicle is equipped with a Premium BOSE system, connect the subwoofer and center channel RCA inputs to the
aftermarket radios. If the aftermarket radio to be installed does not have a dedicated center channel or sub output do not
use this cable. To ensure best sound performance channel summing is not recommended. Use this cable according to the
outputs that are available.

4. Plug the CMX chime module in if necessary (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 oor of the vehicle.

5. The Mute loop (if not cut) will turn the accessory output off when an OnStar® or Bluetooth call is made or received. If the
aftermarket radio has a mute input cut this loop and connect the inner brown wire (next to the blue/white wire) to the mute
input.

SWC Output Connector

• The OS-2X provides a SWC output connector attached to the
OS-RADPWRAUDIO harness. For ease of installation, all necessary
connections for a SWI-X, ECL2, JACK, PS or RC have made for you.

• When using this SWC output connector the radio specic SWC
interface must be programmed for version 2 (refer to SWC interface
programming instructions for exact programming sequence).

• Both loops should also remain in tact.

• During steering wheel button assignment programming each button
should be pressed and held for 1 second after the SWC interface LED
goes out with the exception of the Speak button.

• The speak button should be pressed for less than 1 second and
released.

• Pressing the Speak button for longer than 1.5 SEC will activate
OnStar.

OnStar Volume Adjustment for Vehicles w/o SWC

• If SWC buttons are not present a SPST switch (not included) can be

used to control the OnStar® audio level during an OnStar® connection.

• Connect the Blue wire in pin 6 to one side of a SPST normally open

momentary switch.

• The other side of the SPST switch will be connect to 12 volt constant.

• When OnStar® is active pressing the switch will change the audio level

10 steps.

Pacic Accessory Corporation® | Ontario, Ca. 91761| Ph. 866-931-8021 | [e-mail]

©2014 Pacic Accessory Corporation

www.pac-audio.com

Rev. 050714

Page 2