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PAC - Yes - Yes, requires external module - Radio Interfaces
Car radio replacement radio interfaces allow you to remove your factory radio and install a new factory radio while retaining all of the factory features.
Onstar adaptors - Onstar adaptors allow you to remove your factory radio and install a new factory radio while retaining all of the factoyr Onstar features.
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Pac OS-2C-CTSX Onstar Interface For 2003 - 2007 Cadillac CTS and 2004 - 2005 Cadillac SRX Vehicles$159.99- Radio Replacement interface with for 2003 - 2007 Cadillac CTS and 2004 - 2005 Cadillac SRX
- Retains OnStar and all warning chimes when factory radio is replaced
- For vehicles with or without Bose audio system
- Provides Plug-in-connection for steering wheel control module (sold separately)
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