Opel OBD II diagnostic interface pinout and wiring @ pinoutsguide.com

Pin Number	Pin Name	Opel vehicle function
1		n/a
2	J1850	n/a
3		K-Line, K2, TCM, Sunroof, CDL, Multi-Timer
4	GND	Chassis ground
5	SGND	Signal Ground
6	HS-CAN	Blinkcode
7	K-Line	K-Line, K1 (engine)
8		K-Line, K4
9		reserved
10	PWM	n/c
11		reserved
12		K-Line, K3, ABS, TC, Steering, RTD, OW
13		reserved, K-Line, K5
14	HS-CAN(-)	reserved
15	L-Line	n/c
16	Battery+	Battery +, unswitched

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
OBD-2 universal ISO 15765-4 CAN, SAE J1850 PWM, SAE J1850 VPW, ISO 9141-2, ISO 14230-4 and SAE J1939 diagnostic cable

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connector or cable wiring scheme

Opel OBD II diagnostic interface pinout

Some OBD-II cables schemes: