Owner's Manual
Table Of Contents
Pacific Accessory Corporation - 1502 S. Santa Fe Street, Santa Ana, CA 92705
techsupport@pac-audio.com • Voice: 714-835-3022 • Fax: 714-835-3233 • www.pac-audio.com
Page
2
Testing and Verifying Operation
NOTES:
1. The OS2-GM32 does not retain the factory XM receiver. You will lose the XM option when the factory radio is replaced with an aftermarket
radio.
2. You may use this interface even if the vehicle does not have OnStar® but need to interface the factory amplifier.
Oil Life System Reset Procedures Using Accelerator Pedal.
1. Turn the ignition to ON, with the engine off.
2. Fully press and release the accelerator pedal three times within five seconds.
3. If the CHANGE ENGINE OIL light message flashes, the system is reset. However, if it stays on, it did not reset. You’ll need to refer to the vehicle’s owners
manual or your local GM dealership.
DISCLAIMER: Under no circumstances shall the manufacturer or the distributors of the OS2-GM32 parts be held liable for consequential damages sustained
in connection with the OS2-GM32. The manufacture and it’s distributors will not, nor will they authorize any representative or any other individual to assume
obligation or liability in relation to the OS2-GM32 other than its replacement.
Standard Bose®: Connecting the OS2-GM32 to the vehicle’s Bose® amplifier.
Step 1.
Pre wire the RAD-OS2 wire harness to the aftermarket stereo wire harness. If the aftermarket stereo has a mute wire, cut
the brown wire as close as possible to pin #16 of the RAD-OS2 and connect this mute output wire to the stereo’s mute wire.
The amp remote wire (blu/wht) must be connected to the stereo’s remote wire.
Step 2.
After connecting the RAD-OS2 and OS-GM32 wire harness to the OS2-GM32 main interface, connect the OS-GM32 con-
nector to the factory harness.
1. Turn ignition on. The green ignition On LED on the side of the interface will turn on and the +12v accessory wire will turn on.
2. Turn on the radio and check balancing and fading. Note: Premium Bose® vehicles will not fade as the rear outputs of
aftermarket radio can not be used.
3. Pressing the OnStar® button will mute or turn off the new radio, and allow the audio to be heard in the two front speakers.
The OnStar® active red LED will also turn on. When OnStar® disconnects, the radio will un-mute or turn back on and the
OnStar® LED will turn off. Note: OnStar® audio level can be adjusted using the volume controls on the steering wheel.
4. Turn off vehicle and remove key. RAP will be active and keep the radio on for 10 minutes or until a door is opened.
5. The green LED and radio will turn off when RAP turns off or door is opened.
OnStar® is a registered trademark of OnStar® Corporation.
Bose® is a registered trademark of Bose® Corporation.
WIRE COLOR CIRCUIT CIRCUIT WIRE COLOR
ORANGE ILLUMINATION 8 16
PURPLE/WHT CLASS II DATA 7 15 12 CONSTANT Y ELLOW
BLACK GROUND 6 14 Amplifier remote BLUE
PURPLE/BLK RIGHT REAR (-) 5 13 RIGHT REAR (+) PURPLE
GREEN/BLK LEFT REAR (-) 4 12 LEFT REAR (+) GREEN
OnStar Mono(-) 3 11 OnStar Mono(+)
GRAY/BLK RIGHT FRONT (-) 2 10 RIGHT FRONT (+) GRAY
WHITE/BLACK LEFT FRONT (-) 1 9 LEFT FRONT (+) WHITE
PIN NUMBER
PURPLE/WHTBROWN/WHT
N/A
16 pin OS-GM32 output harness
WIRE COLOR CIRCUIT CIRCUIT WIRE COLOR
WHITE/BLACK LEFT FRONT(-) 9 18 MUTE OUTPUT (-) BROWN loop
GRAY/BLACK RIGHT FRONT (-) 8 17 LEFT FRONT (+) WHITE
GREEN/BLACK LEFT REAR (-) 7 16
PURPLE/BLACK
RIGHT REAR (-) 6 15 RIGHT FRONT (+)
GRAY
BLACK & Relay #85 GROUND 5 14
4 13 LEFT REAR (+) GREEN
ORANGE ILLUMINATION 3 12
BLUE/WHITE AMP TRIGGER 2 11 RIGHT REAR (+) PURPLE
RED Relay #86 Relay control #86 1 10 12V CONSTANT YELLOW & Relay #87
PIN NUMBER
BROWN loop
MUTE Sense input
CHIME MODULE
BLUE ANTENNA
to CM1 ORANGE wire
18 pin RAD-OS2 Input harness
Looking from wire side of plugs
RAD-OS2
102.7 FM
Aftermarket stereo
30
85
86
87
87a
Red wire to accessory
input of radio
Factory 32 pin wire harness
brown
loop wire
Cut brown wire at pin #16 and connect
it to mute input wire of radio
General Motors Class II OnStar® Interface
Factory Radio Replacement
Retention of Bose® Amplifier and OnStar® Option
Pacific Accessory Corporation • Santa Ana, CA 92705
Ignition
On LED
OnStar®
Active
Volume
Adjustment
OS-GM32