Hi i have 3 of these available for BOSE systems that wish to retain onstar with aftermarket head unit.

asking $90 a piece shipped take paypal

dvandentop@msn.com

i have been on here for quite some time and bought and sold stuff.

here is some good info on the device.


http://www.cardomain.com/item/PERGMAH24B


Now you can replace the factory radio in your OnStar and Bose equipped GM vehicle and maintain all of the Bose amplifiers, Bose speakers, and OnStar functionality. The GMAH24B plugs into the connectors in the dash and provides wiring for an aftermarket receiver. It includes on-board switching and amplification to provide OnStar signals through the front two speakers while automatically muting the aftermarket receiver. The GMAH24B plugs into the factory Molex (rectangular) connectors and provides power, ground, and speaker leads. It even reports a “healthy status” to the vehicle’s data bus, and retains the RAP (retained accessory power) that automatically turns off your new radio when you exit the vehicle. Fully compatible with Bose and Premium Bose systems. Non-Bose equipped vehicles should use the GMAH24, available separately.
Note: Add-on chime module GMAHCM is required to retain warning chimes when removing or bypassing the factory Bose amplifiers.

Applications

Any 2000-04 GM vehicle that uses the Class II data bus and Bose audio system (may require GMAHCH chime module, available separately)
2003 Cadillac Escalade
2003 Chevrolet Avalanche
2003 Chevrolet Silverado / Suburban / Tahoe
2000-02 Chevrolet Trailblazer
2003 GMC Sierra
2003 Sierra Denali
2002-03 GMC Envoy
2003-04 Yukon
2003-04 Yukon Denali
2003 Hummer H2
2004 Isuzu Ascender

Shipping Weight: .5 lbs