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C2R-GM29 Radio Replacement Interface for Select 2006-Up GM

C2R-GM29 Radio Replacement Interface for Select 2006-Up GM
Do you want to quickly and easily replace the factory GM LAN Radio?
If so, you need the C2R-GM29 Version 1.4a.18c (formerly GMCOL29) plug-n-play Chime and Data-bus Integration Interface . This interface will allow you to replace the GM radio with an aftermarket radio in the select 2006-UP GM LAN Vehicles listed in the pull-down menu below without OnStar® or when OnStar is not serviced or unwanted. [ see the OS-4 to retain OnStar]
The C2R-GM29 interface replicates all factory warning chimes, audible turn signal indicators and provides a data bus generated 12 volt accessory output that acts just as GM’s R.A.P. (Retained Accessory Power) system did prior to radio removal. R.A.P. keeps the radio powered after the key is off, until the driver door is opened or a 10 minute timer ends, whichever comes first. The C2R-GM29 also provides a single wire output for connecting an optional SWR-IC Steering wheel control interface. SWR-IC is compatible with aftermarket Alpine, Clarion, Eclipse, JVC, Kenwood, Pioneer, Sony, and many other radios. This interface retains the convenience of factory steering wheel controls when upgrading the factory radio with an aftermarket radio.
By using this interface, the Parking Assist System will receive a “healthy” system status and the Rear Seat Audio controls will also be available for use (if equipped).

» Enables aftermarket radio installation without retention of the factory radio
» Supplies the appropriate warning tone from it's built-in speaker such as; door ajar, seat belt, low oil pressure, hi-temp, low fuel, etc.
» Safe & Sound Class II circuitry will not disable vehicle data bus even if interface loses power
» Provides +12v switched accessory output. No more searching for switched +12v in fuse box or kick panel
» 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 approx. 10 minutes or until a door is opened.
» The C2R-GM29 also has four RCA input cables. If the system has a Bose amplifier, connect the RCAs to the RCA outputs of the aftermarket radio. If it does not, cut off the RCA heads, strip the wire leads and connect them to the speaker outputs of the aftermarket radio.
» The Rear seat audio controls also remain functional when the C2R-GM29 is used
Compatibility Notes: [ The following requirements are important and must be met. Please read before purchasing this part ]
1. The C2R-GM29 is compatible with select 2006-Up GM's "BOSE Amplified System", "Standard" or " BOSE®", without Onstar or if OnStar® retention is not required.
2. Recommended Line-level input is 2-4 Volts from aftermarket radio.
3. C2R-GM29 does *NOT* retain factory XM or OnStar. These add-ons will be lost upon replacement of the factory radio.
Click here for INSTALLATION DIAGRAM


1. 2012 Avalanche, Sierra, Silverado Suburban, Tahoe & Yukon equipped with a navigation radio are *NOT* compatible
2. Chevrolet Express vans & GMC Savannah vans equipped with diesel engines are *NOT* compatible
3. Does not retain OnStar. For OnStar retention please use the OS-4
4. Not compatible with BOSE "Premium" amplifier
5. To retain steering wheel controls, the C2R-GM29 provides a single wire for the SWI-RC aftermarket steering wheel control interface. (sold separately).


DISCLAIMER: Under no circumstances shall the manufacturer or the distributors (Discount Car Stereo) of the C2R-GM29 parts be held liable for consequential damages sustained in connection with the C2R-GM29. The manufacture and it’s distributors (Discount Car Stereo) will not, nor will they authorize any representative or any other individual to assume obligation or liability in relation to the C2R-GM29 other than its replacement.

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Part Number C2R-GM29
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Regular Price: $119.95
Discount Price: $74.98 (52.56)
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