Descent control switch (Freelander 2)

The HDC switch controls the selection of the HDC function.

The HDC switch is not fixed. It is mounted on the floor console, in front of the gear selector. Briefly pressing and releasing the HDC switch connects the ignition-on power supply circuit to the ABS module. The first time the HDC switch is pressed and released, the ABS module activates the HDC. Pressing and releasing the HDC switch again will cause the ABS module to disable HDC operation.

To prevent misuse or in the event of a breakdown of the HDC switch, if the switch is not pressed for more than 10 seconds, no status change occurs. If the input signal from the HDC switch is held high for more than 1 minute, a DTC is generated in the ABS module memory.

Activation of brake lights during HDC operation

The operation of the vehicle's brake lights during HDC operation is controlled by the CJB. The ABS module monitors the hydraulic pressure in the brake system and queries the CJB over the high speed CAN bus to activate the brake lights when braking is active.

A pressure threshold and a timer filter prevent the brake lights from flashing when braking using HDC.

Vehicles equipped with the system «Stop/Start» - starting from MY 2010

Activating the downhill guidance system will disable the system «Stop/Start». However, if the downhill control system is activated with the engine off on a cycle «Stop/Start», the engine will restart automatically. If at this time the system «Stop/Start» does not detect the driver in place, for example, if the driver's seat belt is not fastened or the door is open, the engine does not restart. System «Stop/Start» prompts the driver to press the clutch pedal to start the engine. When this happens, a message appears on the message center screen «RESTART REQUIRED PRESS CLUTCH» (Restart required, hit the clutch).

The driver must respond to this request within a limited period of time. Otherwise, a normal restart of the engine using the ignition switch will be required. For more information, see the chapter: Starting system (303-06C Starting system - 2.2L Duratorq - Td4, Vehicles built from 03/2009, Description and function).