DTC U201A-57: Control module main calibration data - Invalid/incomplete software component: Action

NOTE: Due to the mechanical calibration tolerance the correct mirror module assembly must be used for the vehicle model types in question and it is not exchangeable with other vehicle model types

Using the manufacturers approved diagnostic system, compare the vehicle type in the mirror module with the car configuration file (parameter 1), if these do not match the incorrect mirror has been fitted
Using the manufacturers approved diagnostic system, check the configuration of the car configuration file and software version of the mirror module is correct