| Pin Number |
Pin Name |
Description (may be empty) |
| 1 | K-Line | Ignition control (EZS), air-conditioner (KLA), PTS, safety systems (Airbag, SRS, AB) and some other |
| 3 | TNA | TD engine rotation speed |
| 4,5 | GND | Ground |
| 6 | CAN-high | CAN-High (including AirBag system in W203, W209, W220, W240, R230, С215 after 2004y) |
| 7 | K-Line | Engine control diagnostic (ME/MSM/CDI) |
| 8 | Ignition,... | |
| 9 | K-Line | ABS, ASR, ESP, ETS, BAS diagnostic |
| 11 | K-Line | Gearbox and other transmission components (EGS, ETC, FTC) |
| 12 | K-Line | All activity module (AAM), Radio (RD), ICS, ... |
| 13 | K-Line | AB diagnostic - safety systems |
| 14 | CAN-Low | CAN |
| 15 | K-Line | IC, KI), TAU, LWR diagnostic |
| 16 | +12V | Power |
OBD-2 protocols:
1996-2000 : ISO-9141
2000 - 2002 : ISO 9141 or KWP 2000
2003 - 2007 : KWP 2000 or CAN
after 2007 : CAN
Some OBD-II cables schemes:
OBD-2 ISO 9141-2 (14230-4, KWP2000) simple serial cableOBD-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