You'll still retain your factory. Web 1.the radio select rotary switch on the side of the interface must be adjusted to the proper radio setting before plugging the interface into the vehicle (see below for setting chart). Web pac rp4fd11 radiopro4 interface for ford vehicles with can bus from ijsrd.com.
Pac Radiopro4 Radio Replacement Interface Rp4Fd11
Web 1.the radio select rotary switch on the side of the interface. You'll still retain your factory.
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