Hill Descent Control

When the Hill Descent Control™ switch is pressed, the ATCM sends a message to the 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 ABS module uses the hydraulic pump motor and the 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 ABS module continually monitors the descent speed, angle of descent, pump motor run time and solenoid valve use. Once the ABS module determines that a cool down period is needed, the ABS module sends a message to the BCM and the IPC over the HS-CAN  to alert the driver via a message center message that the system requires a cool down period.