Audi OBD-II diagnostic interface pinout pinout and wiring @ pinoutsguide.com

suitable for most Audi models after 1996 (i.e. Audi A3, A4, TT)

Pin	Signal	Description
2	J1850 Bus+
4	CGND	Chassis ground
5	SGND	Signal ground
6	CAN High	J-2284
7	K-LINE	(ISO 9141-2 and ISO/DIS 14230-4)
10	J1850 Bus-
14	CAN Low	J-2284
15	ISO 9141-2 L-LINE	(ISO 9141-2 and ISO/DIS 14230-4)
16	+12v	Battery power

ISO 9141 protocol used for 1996-2001 year models.

2002-2004 - ISO9141 or KWP2000

2005-2007 - ISO9141, KWP2000 or CAN

CAN used in 2008 year and later.

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

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connector or cable wiring scheme

Audi OBD-II diagnostic interface pinout pinout

Some OBD-II cables schemes: