The Acura RDX is Acura’s first compact luxury crossover SUV, taking over from the MDX as Acura's entry-level crossover SUV, as the MDX grew in size and price. Originally, the RDX was built upon the same platform Honda uses for their Civic and CR-V passenger cars, however starting from its third generation, the Acura RDX is built on its own platform. The RDX will require special equipment in order to program a keyless entry remote fob smart key.