PAC OS-2C-CTSX Radio Replacement Interface with OnStar Retention Instruction Manual

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. 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).

Important Notes

1. Use the 4 position selector switch located on the side of the interface to select the best chime output volume for your specific installation. Setting 1 being loudest and 3 being softest. Setting 4 will turn the chimes off 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.

Wiring Connection Chart

Interface Connector

Vehicle Connector

• These wires may not be present in all vehicle harnesses.

Illustration / Schematic

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. PLEASE NOTE: If you cut the mute loop be sure to insulate these wires properly as they are part of a 12v circuit. Do not connect either side of this loop to your aftermarket radio.
4. Connect the interface to the vehicle and the aftermarket radio.
5. Follow the instructions below if you wish to add an optional SWC retention interface.

Steering Wheel Control Output Connector

1. The harness has a SWC output connector. For ease of installation, all necessary connections for an SWI have been made for you.
2. When using this SWC output connector with the SWI-RC, the SWC interface must be programmed for version 2 (refer to SWC interface programming instructions for exact programming sequence and button assignment order).
3. The Brown loops should remain in tact.
4. When using this SWC output connector with an SWICP2, you can either program the SWC interface with a PC or set the DIP switches according to the PC app.

Testing and Verification

1. Turn the ignition on. The LED on the interface will turn on and the +12v accessory wire will turn on.
2. Turn on the radio and check your balance. Note: Fade is not supported as neither the aftermarket radio or the RP interface have the ability to control the amplifier’s fader.
3. If an optional SWC retention interface was used, verify that all SWC are functioning properly.
4. Turn off vehicle and remove key. RAP will be active and keep the radio on for 10 minutes or until the drivers door is opened.
5. The LED and radio will turn off when RAP turns off or the drivers door is opened.
6. Use the 4 position selector switch located on the side of the interface to select the best chime output volume for your specific installation. Setting 1 being loudest and 3 being softest. Setting 4 will turn the chimes off when chimes are still present through the factory speakers.

LED Legend

Solid| Accessory On
Rapid Blink| OnStar Active
Slow Blink| SWC Button Pressed
Off| Accessory Off

Product Updates (Firmware)
The OS-2C-CTSX can be updated with new firmware as it becomes available using the PAC-UP interface updater (sold separately)
Please visit www.pac-audio.com/firmware for available updates.
© 2020 AAMP Global. All rights reserved. PAC is a Power Brand of AAMP Global.
PAC-audio.com

Documents / Resources

| PAC OS-2C-CTSX Radio Replacement Interface with OnStar Retention [pdf] Instruction Manual
OS-2C-CTSX, Radio Replacement Interface with OnStar Retention, OS-2C-CTSX Radio Replacement Interface with OnStar Retention, 541OS2CTSX
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References

• Firmware Updates – PAC

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