OS-2X
Radio Replacement Interface with OnStar Retention for
General Motors Vehicles
Pacic Accessory Corporation
® | Ontario, Ca. 91761 | Ph. 866-931-8021 | support@pac-audio.com
©2014 Pacic Accessory Corporation
www.pac-audio.com
Rev. 050714
Introduction & Features
Important Notes
Wiring Connection Chart
Illustration / Schematic
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 amplier 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.
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)
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.
Aftermarket Radio Connections
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
Wiring
Page 1
Aftermarket
Radio
Connections
Vehicle
Connections
Connect to SWC
Interface. Program
for Version 2.
OS-RADPWRAUDIO
