Happy now with the interface and Inpa setup! So, I lifted the pin (UBatt_1.jpg) and used a transistor BC547/1K/10K as inverter to pull this pin to GND if the interface gets +12V on pin 16 of the OBD2 connector (UBatt_2.jpg). That is why the UBatt dot is always black. Seems the RI pin on the FTD232RL is directly connected to GND on the board. See picture 'Ignition.jpg' resistors R5 & R6.

That solved the Ignition ON indication problem. These were not the proper values to get ~5V at the junction between both resistors. However the values and connections were as: Traced back the tracks from OBD2 pin 1 and found 2 resistors mounted on the board as voltage dividers. Interface connected to OBD2 or not.ĭecided to try to fix this and started to read.įound that RI from TTL-USB converter is used to indicate UBatt and DSR/DTR is used to indicate Ignition ON.

While connecting and testing the interface I found the UBatt and Ignition dots were always black. Installed BMW Standard Tools 2.12 as per instructions of our friend Bimmer with all software he provided in his thread. Interface looks very well designed and has a nice PCB, all components soldered properly on the board. So, got my self a high quality INPA K+DCAN Interface from China.

K dcan cable with switch