Renewing control units

The following points must be borne in mind when the CAS or the engine control unit are renewed:

• If a CAS control unit is renewed, it must be ordered using the vehicle identification number (VIN). Following installation, that starting value must be adjusted to the engine control unit. This starting value adjustment is performed using the service function "DME/DDE - CAS calibration" in the BMW diagnosis system.
• If the engine control unit is renewed, the drive-enable code must be transferred from the CAS to the engine control unit following installation. This procedure is also performed using the service function "DME/DDE - CAS adjustment" in the BMW diagnosis system.
• After the adjustment of the EWS and engine control unit, these are mutually linked. It is not possible to replace one of the two control units as a test.