| Pin | Signal | Description |
| 1 | +12V | Power |
| 4 | CGND | Chassis ground |
| 5 | SGND | Signal ground |
| 7 | ISO 9141-2 K-LINE | engine (ISO-9141 and ISO-14230), automatic transmission diagnostic (in some models) |
| 8 | ISO 9141-2 K-LINE | IKE/KOMBI, ABS, ABS/ASR, ABS/ABD, ESP, DSC, Airbag and other electronic equipment |
| 9 | TD/RPM | Engine rotation speed |
| 16 | +12v | Battery power |
ISO 9141-2 used in BMW 3-Serie, 5-Serie, X5, Z3, Z4, Z8, 740i, 740iL, 750iL.
KWP2000 used in BMW 5-Serie; Generation (E60), BMW 745i, 745Li, 765Li.
Some OBD-II cables schemes:
OBD-2 ISO 9141-2 (14230-4, KWP2000) simple serial cable
OBD-2 J1850 PWM, J1850 VPW serial ELM327 cable
OBD-2 universal ISO 15765-4 CAN, SAE J1850 PWM, SAE J1850 VPW, ISO 9141-2, ISO 14230-4 and SAE J1939 diagnostic cable