Hill Descent Control

When the Hill Descent Control™ switch is pressed, the All Terrain Control Module (ATCM) sends a message to the Anti-Lock Brake System (ABS) module requesting hill descent braking assist. Once the vehicle speed is between 5 kmh (3.1 mph) and 32 kmh (19.9 mph) and the transmission is in REVERSE or any forward gear, the Anti-Lock Brake System (ABS) module uses the hydraulic pump motor and the Hydraulic Control Unit (HCU) solenoid valves to maintain the vehicle speed set by the driver. If the vehicle speed is increased or decreased outside of the operational window, the system remains active but descent speed cannot be set or maintained.

The Hill Descent Control™ system requires a cool down period after sustained use. The Anti-Lock Brake System (ABS) module continually monitors the descent speed, angle of descent, pump motor run time and solenoid valve use. Once the Anti-Lock Brake System (ABS) module determines that a cool down period is needed, the Anti-Lock Brake System (ABS) module sends a message to the Body Control Module (BCM) and the Instrument Panel Cluster (IPC) over the High Speed Controller Area Network (HS-CAN) to alert the driver via a message center message that the system requires a cool down period.