Encrypted Code Registration Method: Notes
Required Special Tool: MB991502-Scan Tool
CAUTION:
Because registering the encrypted codes is done after all previously-registered codes have been erased, you should keep all of the ignition keys that have already been registered accessible.
If the ignition key, immobilizer-ECU or PCM* is replaced or an ignition key is added, encrypted codes of all the ignition keys must be registered. (A maximum of eight different ignition keys can be registered.)
Moreover, when the immobilizer-ECU has been replaced, you will need to use scan tool MB991502 to register the immobilizer-ECU and input the vehicle secret code and to register the password (secret code) that the owner specifies into the immobilizer-ECU
NOTE:
*: If the PCM is replaced, the immobilizer-ECU should be replaced together with it. Each PCM has an encrypted code for immobilizer-ECU, and the encrypted code is registered in the immobilizer-ECU.