Pacic Accessory Corporation - 1502 S. Santa Fe Street, Santa Ana, CA 92705
Page 1
02-23-07
The OS-2BOSE is a plug and play interface that allows replacement of a General Motors Class II factory stereo. It will maintain
operation of the OnStar® system, Bose® amplier and speakers. The OS-2BOSE has on board switching to allow audio from
the OnStar® system to play through the two front factory speakers when OnStar® is active. Retains warning chimes when used with
PAC’s optional CM1 chime module on selected vehicles listed below. Also retains Vehicle Parking Assist chimes.
• Safe & Sound Class II circuitry will not disable vehicle data bus even if interface loses power.
• OnStar® active LED and Ignition on LED
• Provides +12v switched accessory output. No more searching for switched +12v in fuse box or kick panel.
• Smart Sense Mute output to either mute the aftermarket radio or to turn if off when OnStar® is active.
• OnStar® Volume control via factory steering wheel audio controls on Premium Bose® vehicles. Radio controls can be retained to control new radio by using
the SWI-X.
• New radio will operate with the vehicle RAP (Retained Accessory Power) system. The radio stays on after the key is turned off and stays on for approximately
10 minutes or until a door is opened.
Note:
1. The OS-2BOSE does not retain the factory XM receiver, rear seat controls/headphones or rear seat DVD. You will lose these options 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 Bose® amplier.
3. If you are not retaining the Bose® amplier, use the OS-2 interface instead of this OS-2BOSE interface.
Please adjust the fading, balance and tone controls to the center position prior to removing the factory radio.
Note: New vehicles are constantly being researched. If your vehicle is not listed above, check our website for any new
updates or instructions.
OS-2BOSE
rev. 1.4.16
General Motors Class II OnStar
®
and Bose® Interface
Installation Instructions.
OS-GM24
Factory 24 pin wire harness
Factory 12 pin wire harness
OS-2BOSE
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
RAD-OS2
102.7 FM
Aftermarket stereo
30
85
86
87
87a
Red wire to accessory
input of radio
Cut brown wire at pin #16 and connect
it to mute input wire of radio
Rear outputs
not used
Premium Bose®: Connecting the OS-2BOSE to the vehicle’s Bose® amplier.
Note: Due to the design of the Premium Bose® system, there is currently no way of fading from front to rear with an aftermarket radio.
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 rear outputs are not used for this application. The amp remote wire (blu/wht) must be connected to the stereo’s remote
wire.
Step 2.
After connecting the RAD-OS2 and OS-GM24 wire harness to the OS-2BOSE main interface, connect the OS-GM24 con-
nector to the factory harness.
Premium Bose® - These radios have 5 or more EQ settings: 2003-2006 Denali, Escalade, Yukon Denali and Sierra Denali. 2001-
2004 Trail Blazer, Bravada and Envoy SLT. 2003 H2.
Standard Bose® - These radios have only 3 EQ settings: 2003-2006 Avalanche, Sierra, Silverado, Suburban, Tahoe and Yukon SLT,
2004-2007 H2. These vehicles with Standard Bose® require an optional CM1 chime module if warning chimes want to be
retained.
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