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OS-2X
Radio Replacement Interface with OnStar Retention for
General Motors Vehicles
Pacic Accessory Corporation
®
| Ontario, Ca. 91761 | Ph. 866-931-8021 | [email protected]
©2014 Pacic Accessory Corporation
www.pac-audio.com
Rev. 050714
Pacific Accessory Corporation
Testing & Verication
1. Turn the ignition on. The LED on the interface will turn on & the +12v accessory wire will turn on.
2. Turn on the radio & check balance & fade. Note: Premium Factory amplied Systems will not fade as neither the
aftermarket radio or the RP interface have the ability to control the amplier’s fader.
3. Verify that the factory subwoofer (if present) is playing
4. Verify that all SWC are functioning properly for both the aftermarket radio and OnStar. To adjust OnStar volume, press the
OnStar button on the mirror then use the volume buttons on the SWC to adjust the level. The volume will raise a total of 8
times before returning to the original level.
5. 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 Mute/OnStar® button on the steering wheel for 1.5 seconds
will also activate Onstar®.
6. Turn off vehicle & remove key. RAP will be active & keep the radio on for 10 minutes or until the drivers door is opened.
7. The LED & radio will turn off when RAP turns off or the drivers door is opened.
8. Use the 4 position selector switch located on the side of the CMX module to select the best chime output volume for your
specic installation. Setting 1 being loudest and 4 softest.
Page 3
Rear Seat Entertainment (RSE); If equipped
Product Updates (Firmware)
The factory RSE system will function independantly from the aftermarket radio. The unit will power up and pass audio through
the headphones as long as the vehicles ignition is on. If you wish to pass audio from the RSE to the aftermarket radio you must
connect the RCAs from the 12-pin connector to the aftermarket radios auxiliary input. Select the aftermarket radios auxiliary input
to hear RSE audio.
The OS-2X can be updated with new rmware as it becomes available using the PAC-UP interface updater (sold seperately).
Please visit www.pac-audio.com/rmware for available updates.
CMX
chime module
1
4
2
3