Hill Descent Control Switch

The HDC switch controls the selection of the HDC function.

The HDC switch is a non-latching switch installed on the floor console, forward of the gear selector. Pressing and releasing the HDC switch momentarily connects an ignition power feed to the ABS module. With the first press and release of the HDC switch, the ABS module enables operation of the HDC function. When the HDC switch is pressed and released again, the ABS module disables operation of the HDC function.

To guard against incorrect operation or a broken switch, if the switch is pressed for more than 10 seconds no change of state occurs. If the input from the HDC switch is held high for more than one minute, a DTC is stored in the ABS module.