Fotag OBD2 16 pin to DB9 RS232 Serial Port Adapter Cable Diagnostic Extension Cable with Power Switch to Avoid Battery Drain 1.5M 5ft ULTRA SLIMThe OBD2 16 Pin to DB9 RS232 Female Port Cable is ultra slim and flat for superior flexibility and durability. POWER SWITCH With power switch,we designed the useful power switch of this OBD cable to prevent battery damage. 8 PINS OUTThe pin-out is : (OBD II : DB 9) = (4,5:1), (4,5:2), (6:3), (7:4), (14:5),(10:6),(2:7),(15:8),(16:9) ; The on/off switch controls 16:9 connection. This cable is not 16 pin out, it is 8 pin out, please reference the product picture. NOTE:This cable is not meant to be plugged directly into a computers serial port. It's just a cable with two different types of connectors on each end.this is not a signal convert level adapter.