Necessary preliminary work:
Fold back cover (1).
Release nut underneath. Remove positive battery cable from positive battery connection point.
Release battery positive lead (1) from retainers (2).
Release clamp (1).
Release clamps (2).
Unlock tab (3) in direction of arrow. Remove top part of cable holder toward the top and uncover wiring harnesses.
Unfasten nut.
Disconnect positive battery cable (2) from starter motor.
Remove protective cap (2) and release nut underneath.
Remove battery positive lead from alternator and feed out.
NOTE: Reassemble the vehicle.
Check stored fault messages.
Delete fault memory.
BMW X3 Owners Manual > HDC Hill Descent Control: The concept
HDC is a downhill driving assistant that automatically
controls vehicle speed on steep
downhill gradients. Without applying the
brakes, the vehicle moves at slightly more than
walking speed.
Hill Descent Control can be activated at
speeds below approx. 22 mph/35 km/h. When
driving downhill, ...