V-MAC Co-Pilot Operator's Manual 9 SYSTEM COMPONENTS Vehicle Electronic Control Unit (VECU) The VECU is mounted underneath panel D as shown in the graphic's below. The VECU is an electronic control module which provides a wide variety of functions including: Cruise Control Diagnostic Trouble Code (DTC) Logging Differential Locking Idle Shutdown Maintenance Information Road Speed Limiting Speed Control W3060890 VECU Location