Cars, Bikes and Trucks Diagnostic Interfaces  > BMW pinouts
used in BMW car models in 1988-2000's and some Bikes
Pin Signal Description
1 TD  Engine rotation speed
2 CAN-High CAN OBD-II diagnostic
3 CAN-Low
4 Shielding
7 Oil service and Inspection reset  
11 External starter turn on may be N/C
12 Battery indicator may be N/C
14 Battery power +12V
15 ISO 9141-2 L Line ISO 9141-2 RXD- Diagnostic Data link
16 Ignition +12V KL.15 power
17 ISO 9141-2 K Line may be n/c
18 PGSP Programming line
19 GND  
20 ISO 9141-2 K Line  TXD - Diagnostic data link

Pins 17 and 20 may be shorted in diagnostic cable.

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

20 pin BMW OBD2 diagnostic proprietary of BMW OBD II  vehicle diagnostic round 20 pin connector connector layout
20 pin BMW OBD2 diagnostic proprietary connector
According to 7 reports in our database (6 positive and 1 negative) this pinout should be correct.

Is this pinout
BMW OBD II vehicle diagnostic round 20 pin connector visual pinout:
BMW OBD II  vehicle diagnostic round 20 pin connector diagram
click to enlarge
Source(s) of this and additional information:
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