วงจรปลั๊กวิเคราะห์ BMW 15pin 20pin OBDii BMW OBD diagnostic interface pinout OBD-2 Protocol BMW OBD-II diagnostic interface pinout used in all BMW models produced after 2000's Pin Signal Description 1 +12V Ignition(in run or start) 4 CGND Chassis ground 5 SGND Signal ground 7 ISO 9141-2 K-LINE engine (ISO-9141 and ISO-14230), au…