HEADLAMP LEVELLING

The Light Levelling ECU is used in many BMW models and was also fitted to the L322 when BMW owned Land Rover. It was fitted to the vehicle only in conjunction with Xenon headlamps. Normal halogen lamp cars have either no self levelling capability or use the Light check module which is also capable of supporting this feature. Indeed due to a tendency for this ECU to go faulty, the ECU ceased to be fitted after a couple of years from the L322's introduction. The system relies on reading inputs from the front and rear axle height sensors, which are available in single wiper and dual wiper for vehicles with and without this ECU, and using their difference and applying speed related adjustments and other calculations determines what changes are happening to the angle of the vehicle. It then uses more map information to find the right value to apply to the stepper motors located inside both headlamp modules to adjust the angle of the headlamp to compensate for the change in angle of the vehicle. It is quite a dynamic process performed at some speed resulting in a capability for very fast regulation of the height that counters the effects of bumps and . As with all BMW designed ECU's this ECU has configuration to suit a very wide variety of applications and operational factors giving it immense flexibility. It has a variety of possible inputs which controlling.