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20 pin BMW OBD2 diagnostic proprietary connector layout
20 pin BMW OBD2 diagnostic proprietary connector
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
 

According to 8 reports in our database (7 positive and 1 negative) this pinout should be correct.

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