The BMW E36’s anti-theft system, often referred to as EWS (Electronic Immobilizer System), can be a source of confusion for owners. This guide aims to clarify the different EWS versions found in E36 models and discuss the possibilities of an EWS delete, particularly for engine swaps.
Understanding EWS Variations in the BMW E36
The E36 utilized several iterations of the EWS system throughout its production run. Misinformation often arises when generalizing solutions across these different systems. A common misconception is that a simple wire snip or jump can bypass the EWS. While this might work for very early “Drive Away Protection” systems or even some EWS 1 setups, it’s definitely not a universal solution, especially for later EWS 2 systems.
EWS 1 and early EWS 2 systems in OBD1 cars (pre-1996) often utilized a chip within the DME (Digital Motor Electronics) that could be replaced to achieve a bypass. Later OBD2 EWS 2 systems, paired with the Siemens MS41.1 DME, are significantly more complex and cannot be bypassed with a simple chip swap. These DMEs require specialized flashing or programming equipment.
A helpful resource for understanding the intricacies of BMW EWS systems is the following PDF document: http://www.europeantransmissions.com/Bulletin/DTC.BMW/understandthe%20EWS%20BMW.pdf
E36 EWS Delete Options
The desire for an EWS delete often arises during engine swaps. For instance, swapping an OBD2 engine (like an M52 or S52) with EWS 2 into an earlier E36 without an EWS system presents a challenge.
1. DME Reprogramming: One option is to have the Siemens MS41.1 DME professionally reprogrammed to ignore the EWS 2 system. This requires sending the DME to a specialist with the necessary flashing/programming tools. This is often the cleanest solution but can be more expensive.
2. EWS System Transplant: Another method involves transplanting the entire EWS 2 system from the donor car, including the key with its embedded transponder chip. The key doesn’t need its mechanical portion; only the chip is necessary. This chip needs to be placed in proximity to the EWS antenna ring in the steering column. This method avoids DME reprogramming but requires more intricate wiring and potentially sourcing an antenna ring.
Important Considerations
OBD1 vs. OBD2: It’s crucial to distinguish between OBD1 and OBD2 systems when considering EWS deletion. Solutions for OBD1 systems generally don’t apply to OBD2 systems.
DME Types: Identifying the DME (Bosch 413 red label, silver label, or Siemens MS41.1) is vital, as each has specific EWS interactions and bypass possibilities. Red label 413 DMEs are generally non-EWS, while silver label 413 DMEs are EWS compatible. Silver label DMEs can sometimes be chipped for bypass or performance enhancement, but this is not possible with the Siemens MS41.1.
Turner Motorsport Chip: For certain silver label 413 DMEs, Turner Motorsport offers a chip that bypasses the EWS and provides performance enhancements. http://www.turnermotorsport.com/html/detail.asp?PRODUCT_ID=413%20D-EWS. This is not compatible with OBD2 cars.
Conclusion
Deleting the EWS system in an E36 requires a thorough understanding of the specific EWS version and the corresponding DME. While solutions exist for various scenarios, a simple, universal fix does not. Careful research and accurate information are crucial to avoid potential problems.
Wiring diagrams for various E36 models can be found here: http://wedophones.com/BMWManualsLead.htm
Consult reputable BMW specialists for guidance on the best approach for your specific E36 and engine swap project.
