Smart Drive Unit (SDU) Operation

The SDU is located on the battery enclosure on the driver side of the engine compartment.

The Transmission Control Module (TCM) controls the SDU with a Pulse Width Modulated (PWM) signal. Based on that signal, the SDU varies voltage applied to the electric pump motor, that varies the speed of the motor. The SDU receives battery voltage through a dedicated fuse and does not communicate on any bus. Refer to the Wiring Diagrams for proper circuit and pin information.