Hill Descent Control
HDC fade-out HDC fade-out gradually decreases the HDC brake intervention with the effect that the rate of hill descent will increase. If this occurs the HDC information light will flash and the warning chime will sound for the period that HDC takes to fade. HDC will be disabled completely once the descent is complete.
If required (e.g. the angle of the descent levels out significantly), fade-out may be achieved deliberately by deselecting HDC while the system is operating.
If a fault with the HDC system is detected, or if the braking system reaches a pre-set temperature due to extreme conditions, HDC will automatically fade out.
HDC ‘failure’ light - AMBER The light illuminates briefly as a bulb and system check when the starter switch is turned to position ‘II’.
If the light illuminates at any other time, either a fault has occurred which affects the functionality of the system, or over-use of the system has been detected, in which case HDC may ‘fade out’.
NOTE: System faults which cause the ‘failure’ light to illuminate after the initial system checks, or whilst driving, will be accompanied by the warning chime sounding 3 times.
HDC information light - GREEN The light illuminates briefly as a bulb and system check when the starter switch is turned to position ‘II’ and also when HDC is selected.
If HDC is selected when the operating gears (LOW range) are engaged, the light will illuminate continuously.
If HDC has been selected but the system's operating criteria are not met (i.e. gearbox still in high range or vehicle speed too high), the information light will flash and the warning chime will sound continuously.
If the light flashes while HDC is active, normal functionality may cease and HDC ‘fade out’ may be induced.