I was tired of driving to the dealer for errors in automatic climate control or FENIX and putting 35 euros on the table for reading the fault memory. I built a flashbox today with which I can also turn off the systems that are not read via BrickDiag or VOL-FCR at my ’96s 850. With the Blinkbox I can now read air conditioning automation (ECC), engine control (ECU) FENIX and CruiseControl. I’m probably still working with the ignition control unit, but I don’t have it on my L I got a 12V LED and a 1.8k ohm resistance. In addition a small plastic box, a button and a rotary switch with at least 3 positions. Because my soldering skills are not the best I used a ready-made OBD2 cable. The cable has a finished plug and otherwise open ends. The color coding of the cable did not correspond to any standard and a occupancy schedule was not included, so I have the necessary cables by measuring I soldered the resistor to Pin16 and then to the plus line of the LED. The minus of the LED then to the button input. From the button output two lines go parallel, one to the pin5 and one to the input of the rotary switch. The three outputs of the rotary switch I have with Pin3 (ECU,engine control unit, motor control unit FENIX),Pin6 (ECC, electronic climatre control, climate control) In this way, I can easily select which control unit I want to turn off. To make sure I remember the next month, I glued a sticker on the box with Tesa. By pressing the button (1 second) a connection between Pin16 and Pin5 and the pin of the control unit selected with the rotary switch is switched (shown by LED lights), which initiates the blinking process. In order to get to the next code, you have to press the button for 1 second again. If all the codes have been output, it starts from the front. To delete the codes, you have to read out all of them and then press the button for 5 seconds twice in a row. In between, the LED lights up permanently, but goes out after the second press. Then 1-1-1 should flash for error-free (in theory).