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BMW Comfort Access

Technical research and documentation of BMW’s keyless entry system — system architecture, RF subsystems, key fob internals, and block diagrams.

System Overview

pdf
Comfort Access System Overview Complete system description and operating principles
644 KB → pdf
System Block Diagram High-level component architecture
52 KB → pdf
Comfort Access Block Diagram Detailed CA subsystem diagram
24 KB → pdf
Technical Description Detailed technical specifications
64 KB →

Hardware & RF

pdf
125 kHz Transponder Unit Low-frequency antenna module specifications
556 KB → pdf
Key Fob Technical Description Remote key fob hardware and RF characteristics
64 KB → pdf
Homologation Board Regulatory certification test board
88 KB →

Photographs

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External Photographs Exterior views of the CA module and housing
276 KB → pdf
Internal Photographs PCB and component-level teardown images
228 KB → pdf
Additional Internal Photos Supplementary teardown documentation
112 KB → png
System Illustration Conceptual diagram of the keyless entry system
43 KB →

Reference

pdf
Nissan Intelligent Key Comparison Cross-reference with Nissan’s keyless entry implementation
1.9 MB →