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20 pin car OBD2 proprietary connector layout
20 pin car OBD2 proprietary connector
at the car side
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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