GM Chime & Data-Bus Interface C2R-GM24
For most 2001-2007 GM vehicles SUV's and trucks. Retains warning chimes when replacing factory radio in vehicles this interface allows you to Retains all warning chimes including back-up chimes, memory seats, low fuel, door/hatch ajar and others, Provides a +12volt accessory wire. Retains RAP (Retained Accessory Power) when key is turned off. Radio stays on until the door is opened or for aproximately 10 minutes. Supplied wire harness to connect aftermarket stereo to factory speakers. Will work in vehicle that have the factory Bose® amplifier removed or bypassed. Custom wiring is required. Buzzer is built into the interface. If the Bose® amplifier is not used bypassed, you can use the C2R-GM24 to retain the warning chimes.
Vehicles supported: 2000-2007 Cavalier, Impala, Monte Carlo and Trail Blazer-non-Bose® 2002-2003 Malibu 2002-2003
Envoy SLE-not SLT 2001-2003 Montana and Venture 2003 Avalanche, Express, Silverado, Suburban,
Tahoe, Savana, Sierra-not Denali, Yukon SLT and Bravada 2004 Grand Prix GTP Vehicles not support with exception of note: 2003 Hummer H2,
Cadillac Escalade and all Denali's 2002-2003 Envoy SLT and many more vehicles with RDS radio
What is Class 2 databus GM radio ?
The Class 2 system is a Serial Data Link used by GM in its vehicles, and is based on the SAE J1850 protocol, which is widely used in the U.S. It is through this data link that the body control module (or BCM) receives information and commands that are essential in determining its mode of operation.The BCM is connected, through Class 2 wiring, to the instrument panel cluster (IPC), the powertrain control module (PCM), the data link connector (DLC) and the radio. Recently GM has now included the driver’s door module, passenger’s door module, rear seat audio controller, vehicle communication interface module or OnStar®, steering wheel audio controls, rear seat entertainment (RSE), CD changer, radio, DVD/Video, amplifier and XM radio as part of Class II. Since these new modules are part of the audio system and security system, you are now hearing more about Class II. Connected to this same data wire is the Body Control Module (BCM), Powertrain Control Module (PCM), Transfer Case Shift Control Module, Heater & A/C controls (HVAC), Inflatable Restraint Sensing and Diagnostic Module, Theft Deterrent Control Module, Memory Seat Module, Drivers Information Center (DIC), Key Lights Seatbelt Chimes (most vehicles), Instrument Panel Cluster (IPC), Suspension Control Module, Electronic Brake Control Module (EBCM) and other modules.
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Affects of removing Class 2 radio from your vehicle 2000 and up
( Most Cavaliers, Sunfires and other base models do not offer most, if any of these features.
Check the vehicle owner’s manual to see available features. )
Displays current settings
Oil life monitor reset
Tire inflation monitor reset
Delayed headlamp illumination
Automatic door lock and unlock
Remote visual/audible verification of remote lock/unlock
Enable/Disable content theft
Enable/Disable trunk lock shock sensor
Short or long horn with remote lock/unlock
Key fob transmitter programming
The radio is used as a control panel to communicate with the vehicles computer for the customization of certain “convenience features”. All features work and remain at current settings with the factory radio removed, but can only be customized and/or reset by an authorized service center. More important than the above features and chime, there is no switched 12 volt. power supplied in the radios plug, so it will need to be sourced somewhere else such as the factory fuse panel. A 10A to 30A fused accessory power source is recommended. Depending on the vehicle there are several choices in the factory fuse panel, such as the sunroof or windshield wipers.
