I bought this P.A. Soft BMW Scanner V1.3.6 diagnostic tool last week. I installed the software and then connected it to the RS232 (serial port) on my laptop and then ran the software after plugging in the OBD2 to my 1999 E46 318i to reset the engine light. My COM port1 is working prefectly but I got this error message...'No communication with unit. Do you want to try again?'.
Could anyone help me to sort out this connection problem please?