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Home >> Audi >> 2010 >> S4 Automatic DCT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1078 (Anti-Lock Brake System (Abs) And Stability Control) >> Description And Operation >> Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description >> System Operation >> Hill Descent Control

Hill Descent Control

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

The Hill Descent Control feature is enabled and disabled through the menu in the message center, refer to the Owner's Literature. When the system is enabled, the IPC sends a hill descent braking assist message to the GWM over the HS-CAN3. The GWM relays this message to the ABS module over the HS-CAN2. Once the vehicle speed is between 3 km/h (2 mph) and 32 km/h (20 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 feature 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 a cool down period is needed, the module sends a message to the GWM over the HS-CAN2. The GWM relays the message to the IPC over the HS-CAN3 to display HILL DESCENT CONTROL OFF SYSTEM COOLING in the message center.

Hill descent control has 3 modes of operation:

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