The introduction of microcomputer controlled Serial Multiplex Systems, multifunction “Smart switches”, and “Smart Power MOSFETs” provide the opportunity to enhance the wiper control system on passenger cars. As part of a Multiplex System, the Smart Wiper Control System lends itself to ergonomic styling in addition to offering the following innovations: 1. Variable wiper motor speed 2. Vehicle operator defined intermittent wipe interval 3. Fault tolerant controls 4. Self test and system diagnostics This paper describes software and hardware considerations in the implementation of a Smart Wiper Control System - a system that provides a direct feedback to the operator, improves mechanical reliability, and provides diagnostic capability.