BMW - Immobilizer

Abbreviations

DME=Digital Motor Electronics
DDE=Digital Diesel Electronics
EWS=Electronic drive-away protection
CAS=Car access system (immobilizer)

Generations

  1. DME/DDE and EWS ECU
    • EWS2
    • EWS3
    • EWS3D
  2. DME/DDE and CAS ECU

DME/DDE <-> EWS synchronization

Two values, one fixed, one rolling. Coding must be performed in both engine (DME/DDE) and immobilizer ECU at the same time, otherwise immobilizer not allowing start.

Incorrect synchronization usually results in DTC "2737 EWS manipulation protection"

Coverage in BimCOM