Installation Guide

ManualsBrandsPAC ManualsAudio accessories & installationWiring Interface

Radio Replacement Interface with OnStar Retention

for select General Motors Vehicles

PAC-audio.com

Pacific Accessory Corporation

Page 1

Rev. 071417

OS-2C-CTSX

Introduction & Features

Important Notes

Wiring Connection Chart

Illustration / Schematic

The OS-2C-CTSX 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 Warning Chimes and factory amplier (Standard or BOSE®) when the original

radio is removed. The OS-2C-CTSX provides Data-Bus driven outputs such as retained accessory power (RAP), vehicle speed

signal (VSS), illumination, reverse trigger and parking brake. The OS-2C-CTSX also provides a secondary output for adding an

optional PAC Steering Wheel Control (SWC) retention interface (SWI-RC, SWI-CP2, SWI-X).

1. Use the 4 position selector switch located on the side of the interface to select the best chime output volume for your specic

installation. Setting 1 being loudest and 3 being softest. Setting 4 will turn the chimes o󰀨 when chimes are still present

through the factory speakers.

2. In order for the Brown mute wire to output a signal, the Brown / White mute loop on the interface connector must be cut.

3. The SWC will not control the aftermarket radio when OnStar is active.

4. The voice button on the SWC will only control the aftermarket radio and cannot be used to control the OnStar.

5. The OnStar volume can be adjusted using the volume SWC when OnStar is active.

6. You can use either the analog VSS or the Data-Bus driven VSS.

Green Parking Brake Output (-)

Pink Vehicle Speed Signal

(Data-Bus Driven)

Red Accessory Output

(10 amp)

Orange / White Illumination Output (+)

Violet / White Reverse Output (+)

Brown Mute Output (-)

Brown / White Loop Mute Loop

Interface Connector

Yellow Battery +12v

Black Ground

Blue Antenna On Input

White Front L + input

White / Black Front L - input

Gray Front R + input

Gray / Black Front R - input

Pink (x 2) Vehicle Speed Signal

(Analog)*

Vehicle Connector

Aftermarket Radio

Connections

To Vehicle

Connector

To optional SWC interface

Acc On

LED

* These wires may not be present in

all vehicle harnesses.

Summary of content (2 pages)

PAGE 1
OS-2C-CTSX Radio Replacement Interface with OnStar Retention for select General Motors Vehicles Introduction & Features The OS-2C-CTSX 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 Warning Chimes and factory amplifier (Standard or BOSE®) when the original radio is removed.
PAGE 2
OS-2C-CTSX Radio Replacement Interface with OnStar Retention for select General Motors Vehicles Installation Steps 1. It is EXTREMELY important to make sure the ignition is off and the driver’s door is open before connecting the interface to the vehicle. 2. Make all connections as described in the chart on page 1. 3. If you are using the Brown mute wire, the Brown / White mute loop must be cut in order for this wire to output a signal.