BMW OBD II vehicle diagnostic connector pinout PDF Print E-mail

used in all BMW models in 1988-2000's

Pin Signal Description
1 Engine rotation speed TD
2 OBD-II diagnostic
7 Oil service and Inspection reset
11 External starter turn on
14 Battery power
15 ISO 9141-2 L Line RXD- Diagnostic Data link
16 Ignition +12V
17 ISO 9141-2 K Line n/c?
18 PGSP Programming line
19 GND
20 ISO 9141-2 K Line TXD - Diagnostic data link

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
 
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