I copied this from the mofv.com site's FAQ's. Hope this helps.The REN, as stated below is the non-nav us model w/o VR or Uconnect. It is high speed..
The radio types are as follows:
RER is the US Navigation radio w/internal VR and U-Connect
REW is the European Navigation Radio w/internal VR and U-Connect (VR & UConnect not equipped in MY07 European vehicles)
REP is the Rest of the World Navigation Radio w/internal VR and U-Connect
REN is the US non-Navigation w/o internal VR or UConnect
REZ is the European non-Navigation Radio w/o internal VR or UConnect
REU is a MyGIG variant for the Chrysler Journey vehicle only. It has an external display and an internal 6 disc DVD changer. There is no touch screen, rather a joy stick for user HMI.
Note: Wranglers are currently only available with UConnect or Voice Recognition disabled, because there is a degraded performance concern in the Wrangler environment.
Q: How does the MyGIG radio “talk” to the vehicle?
A: Through a special serial digital bus called a CAN bus. CAN stands for Controller Area Network and it allows electronic devices in your car to communicate with other devices a lot like how computers can communicate with other computers on a network. It controls many of the items in your car such as door locks, making the MyGIG radio stop playing video in drive (I hate that one so I had to mention it), your ECU, transmission, basically everything that has a sensor, switch, or simple device that can offer the simplest of information like car seat positions is connected to it.. You should have 2 CAN-Bus wires running to your radio (Pins #2 (White) and #13 (White/Orange) on the large grey radio plug). If you are installing a new radio or just happen to be in your dashboard clipping wires because you are drunk, remember NOT to cut the CAN-Bus wires, pass power into them, ground them, or hook up speaker wires to them. You will likely end up with an unusable car let alone radio.
Q: Can I replace my current radio with a MyGIG radio?
A: Maybe. MyGIG upgrades are only available on certain 2007+ vehicles and backward compatibility can change over time. Also, the work required will depend on the type of MyGIG upgrade, and the options already installed in the vehicle. In addition, Wranglers currently do not support U-Connect or VR. Also note that Chrysler, Dodge and Jeep Vehicles use two different vehicle CAN bus speeds and therefore the radio part number must match the vehicle or the radio will not operate.
The CAN speeds for each specific model are listed below:
Sebring, Avenger, 300C, Charger, Magnum, Durango, Aspen, Grand Cherokee, Dakota, Commander – Low Speed
Wrangler, Liberty, Nitro, Grand Caravan, Town & Country – High Speed
08 Rubi Unlimited named Freebird
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