Electronic Immobilizer: Notes
The electronic immobilizer (EWS) is both an anti-theft system and start enable device.
The 4th generation EWS is an enhancement of the EWS used to date. This enhancement uses a new and modern encryption method. Each vehicle is assigned a 128-bit secret code. This secret code is stored in a BMW database. This means that the secret code is only known to BMW.
The secret code is programmed and locked in the following control units:
- CAS control unit (not E83) The EWS is integrated into the CAS control unit.
- EWS control unit (only E83) The E83 has an EWS control unit but no CAS control unit.
- DME/DDE control unit
When the secret code is locked in the control units, it can no longer be deleted or changed. This means that each control unit is assigned to a certain vehicle. The control units mutually identify themselves with the secret code and the same algorithm. In the 4th generation EWS, there is no direct line (immobilizer data line) between the DME/DDE and CAS (not E83). The CAN data line (PT-CAN and K-CAN) and the K bus (also known as the CAS bus) are used to transmit the EWS signal. The K bus is used whenever the EWS signal cannot be transmitted on the CAN data line. > E83: Data transfer between the EWS control unit and the DME/DDE via an immobilizer data line as previously.
Use of the electronic immobilizer (4th generation):
| Development series | Engines | Engine control unit |
|---|---|---|
| Power stages: T = TopO = Upper power stageM = Medium power stageU = Lower power stageK = Smallest power stageRelease-relevant update: 0 = New development1-9 =Update | ||
| E60, E61, E63, E64 | N52B25U1, N52B25O1, N52B30M1, N52B30O1 | MSV80 |
| E81, E82, E87, E88, E90, E90 M3, E91, E92, E92 M3, E93, E93 M3 | N53B25U0, N53B30U0, N53B30O0, N54B30O0 | MSD80 |
| N43B20O0 | MSD80.2 | |
| N46B20O2 | MEV17.2.1 | |
| N47D20O0 | DDE70 | |
| N43B16, N43B20U0, N43B20O0 | MSD80.2 | |
| N45B16O2, N46B20U2, N46B20O2 | MEV17.2.1 | |
| N51B30M0, N52B25U1, N52B25O1, N52B30U0, N52B30M1, N52B30O1 | MSV80 | |
| N47D20U0, N47D20O0 | DDE70 | |
| N53B30U0, N53B30O0, N54B30O0 | MSD80 | |
| S65 | MSS60 | |
| E83 | N52B25O1, N52B30U1, N52B30O1 | MSV80 |
| N46B20O2 | MEV17.2.1 | |
| N47D20O0 | DDE70 | |
| E70, E71 | N52B30O1 | MSV80 |
| N54B30O0 | MSD81.0 | |
| N63B44O0 | MSD85.1 | |
| R55, R56 | N12 | MEV17.2 |
| N14 | MED17.2 | |