Before go deep into the topic today, let’s check the ICOM A and ICOM B module indicator and meanings.
It is not different to see that if the Red LED indicator of either ICOM A or ICOM B emulator flashes, the Rheingold ISTA-D ISTA-P software will report error and fail to communicate with vehicle.

Problem& Symptom:
BMW ICOM A2+B+C diagnostic system A2 module red indicator blinking when connected to vehicle with LAN cable.

Solution:
2 solutions provided by experienced BMW ICOM diagnostic system experts:

DISCLAIMER: We are not responsible for the damage.

1)
1-rehot hot air gun this IC
2- Replace or change new one if necessary
3-The problem is the IC

2)
Fix the ICOM A2 emulator firmware follow the PCB board displayed below:
The pulse generator to buy on auctions

white wire=the line to the WiFi antenna.
Others all marked in the PCB board

http://cheapobd2.com/2015/08/04/bmw-icom-a2-emulator-system-red-indicator-flash-fixed/

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