dearborn protocol adapter 5 is designed to help manufacturers diagnostic the fault of trucks brake warning device, comfort, safety, emissions, air suspension, trailer and maintenance,to provide in-depth functionality for each application. it is based on the ds he maintenance of the commercial vehicle manufacturers.it covering all critical systems, including engines,transmissions, multiple systems and widely used, it's user friendly.dear,born protocol adapter 5 is an proferssinal tool for t ,trailers, buses and light commercial vehicles.it covers.syi