DME/DDE - CAS adjustment

In the case of a new engine control unit, the service function "DME/DDE - CAS adjustment" in the BMW diagnosis system is used to read the EWS drive-enable code from the CAS and transfer it into the engine control unit. This means that the engine control unit and the CAS control unit are mutually linked.

If the engine control unit is already linked to the CAS, the service function is used to perform a starting value calibration. This means that the random code calculation between the CAS and the engine control unit is adjusted.

A start calibration is required if there is a variance in the rolling codes caused by the influence of errors in the two control units. As of EWS4, a start calibration is no longer required.

Locking the remote key/spare key 

The service function "Remote key/Lock/Enable Key" in the BMW diagnosis system can be used to lock or enable remote key keys or spare keys.

The locking is recommended when a remote key or a spare key is lost or stolen. With a locked remote key (or spare key), engine start is not possible. The functions of the remote key are also locked.

A remote key or a spare key can only be locked if the remote key or spare key has been used at least once and it is not inserted in the ignition lock.

To perform the service function, it is required that a valid and enabled remote key or a valid and enabled spare key is detected in the ignition lock.