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9 pin D-SUB female connector layout
9 pin D-SUB female connector
16 pin J1962 OBD-2 car proprietary connector layout
16 pin J1962 OBD-2 car proprietary connector

Simple OBD-2 iso9141-2 RS-232 cable schema

Components:
 

R1,2,6,7,9,10 - 560 ohm, 0.25W
R3,4,5,8 - 4K7 OHM, 0.125w
T1     - BC556 or 2N3906
T2,T3  - BC546 or 2N3904
One of our users reports that from collector of t1, r4 has to go to GND.
 
See also PC RS232 interface details.

Tx is -12V when inactive. therefore the diagram correctly shows that r4 goes to tx because it uses the -12V to pull down Rx when RS232 is in Rx mode.

Is this document correct or incorrect?.
There are 5 reports in our database: 3 positive and 2 negative.
PinoutsGuide.com > Cars and bikes interfaces > Pinout of OBD-2 ISO 9141-2 (14230-4, KWP2000) simple RS-232 cable schematic and layout of 9 pin D-SUB female connector and 16 pin car OBD2 special connector
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