Hill descent control
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Land Rover Discovery, 2003 Land Rover Discovery, 2002 Land Rover Discovery, 2001 Land Rover Discovery, and 2000 Land Rover Discovery. However, it is still accessible from the selected car via links, so may be relevant.
The BCU provides an output signal to the SLABS ECU for automatic transmission in neutral for HDC control. The BCU checks the status of the ignition and 'gearbox state' inputs and provides a 'Neutral selected' output. If the ignition is on and 'gearbox state' is Neutral, the 'Neutral selected' output is on, otherwise 'Neutral selected' is off.