Calibration

Calibration

The self-levelling sensors must be calibrated on vehicles "with steel springs". The self-levelling sensors must be calibrated before adjusting the lights as part of the "vehicle handover".

Re-calibration is only required following repairs, adjustment work on the chassis, replacement of the headlight control unit or replacement of the self-levelling sensors.

Calibration is essential in order to store the zero-position of the self-levelling sensors in the headlight control unit. This set zero value is required in order to calculate the position to be set for the stepper motor for automatic range adjustment.

NOTES: As soon as a calibration error is detected, a fault entry is recorded in the headlight control unit. The driver is alerted to this by the message "Headlight system fault" on the on-board computer in the instrument cluster.

For vehicles with air suspension, another control unit is used to calibrate the self-levelling sensors in the air suspension system. The values for these self-levelling sensors are stored as CAN signals in CAN. Calibration by the headlight control unit is not required therefore as the required signals are evaluated directly by the headlight control units.