The yellow Siemens-style EDIC or DK head communicates between a BMW and a diagnostic computer such as GT1. OldBMW.ru's illustrated Wi-Fi modification documents the factory wireless hardware and the author's later Ethernet-to-Wi-Fi bridge, including photographs of an original head and a replica.
All illustrations in this guide and its two PCB galleries are credited to OldBMW.ru's original article and reproduced with the rights holder's permission, as confirmed by the contributor.
Earlier and later diagnostic heads
The independent account distinguishes the orange MoDiC III head from the later yellow GT1/EDIC head. It describes the former's wired link as serial and the latter's as Ethernet. Its discussion of radio cards refers to specific factory hardware and does not establish compatibility for every surviving device.
Original wireless and an added bridge
The original article describes the period wireless hardware in the testers and heads. Its alternative places a small Wi-Fi router on the yellow head's Ethernet path: the diagnostic software communicates through the head's network interface while the router carries that traffic wirelessly. An external bridge and an internal installation are different physical arrangements, not factory features of every EDIC unit.
What the PCB photographs document
The author shows an original Siemens head opened into separate boards, checks the space for a small router and photographs the selected power and Ethernet connections. A second sequence covers a replica with a different internal layout. These photographs document particular examples; they do not establish a universal pinout, spare power capacity or a safe connection point for another board revision. Verify the actual hardware and intended use before any electrical modification.
Complete PCB photo sequences
- Original Siemens head: boards, router fit, wiring and reassembly — 31 photographs.
- Replica head: boards, router fit, wiring and reassembly — 19 technical photographs plus the original article's closing image.
The original page includes the full discussion, numbered workshop photographs and the author's explanation of both approaches. See the complete original illustrated article at OldBMW.ru.
Sources
- Wi-Fi modification for BMW GT1/EDIC diagnostic head, OldBMW.ru; first-hand account and original photo sequence, reproduced with permission.
- BMW ST406 Coding and Programming: equipment, BMW service training hosted by Internet Archive; GT1, DISplus, diagnostic heads and workshop connections.