Pinpoint Test I: The Hill Descent Control™ System Is Inoperative: Notes
WARNING: This page is about a different car, the 2016 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Vehicle Dynamic Systems for schematic and connector information.
Normal Operation and Fault Conditions
Hill Descent Control™ can be activated by momentarily pressing the Hill Descent Control™ switch at speeds between 3 km/h (2 mph) and 16 km/h (10 mph), but the system stays in control up to 32 km/h (20 mph). At speeds between 32 km/h (20 mph) and 64 km/h (40 mph), Hill Descent Control™ does not set or maintain speeds. Hill Descent Control™ automatically disables itself above 64 km/h (40 mph).
When the switch is pressed, the IPC senses ground through the switch and sends a message to the ABS module along the HS-CAN to enable or disable the Hill Descent Control™ system.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| C2809 | Hill Descent Control Switch Stuck | This DTC sets during the key cycle if the IPC senses a short to ground on the Hill Descent Control™ circuit, if the Hill Descent Control™ switch is pressed for longer than 30 seconds or if the Hill Descent Control™ switch is pressed during the on-demand self-test. |
Possible Causes
- Wiring, terminals or connectors
- Hill Descent Control™ switch
- IPC