An overview of different connectors as used for OBD-II diagnostic systems.

OBD-II Connector, J1962

Diagnostic connector (female) of the car:

Pin-No. Description 1 Manufacturer mandated 2 J1850 Bus+ 3 Manufacturer mandated 4 Car ground 5 Signal ground 6 CAN High (J-2284) 7 ISO 9141-2 K output 8 Manufacturer mandated 9 Manufacturer mandated 10 J1850 Bus 11 Manufacturer mandated 12 Manufacturer mandated 13 Manufacturer mandated 14 CAN Low (J-2284) 15 ISO 9141-2 L output 16 Battery (+) voltage

Used pins of the connector shows kind of protocol: Pin (Signal) Pin (Masse) Pin (Signal) Pin (Signal) Pin (+12 V) Protocol -- 4 + 5 7 15 *) 16 ISO 9141-2 2 4 + 5 -- 10 16 PWM J1850 2 4 + 5 -- -- 16 VPW J1850 -- 4 + 5 6 14 16 CAN Bus *) Pin 15 only for older ISO 9141 implementations all other pins are manufacturer reserved and not used for standard OBD-II

Diagnostic connector (male) of diagnostic tool:

Contact usage of some manufacturers:

Pin	SAE J1979, ISO 15031	GM	Fiat	Opel	Saab	Isuzu	GM-LAN since 5.2002
1	Manufacturer mandated	second UART	ABS, Brakes, K-Line	reserved	Saab Instruments (+)	SIR (GM8192 Prot.)	SW-LS-CAN (33kB) or DW-FT-CAN (+) (<125kB)
2	J1850 (+) PWM/VPW	J1850(+) VPW	DW-FT-CAN(+)	n/a	n/a	n/a	n/a
3	Manufacturer mandated	Comfort	Airbag	K-Line, K2, TCM, Sunroof, CDL, Multi-Timer	n/a	ABS (KW81-Prot.)	MS-CAN (+) (95kB)
4	Chassis ground	Chassis ground	Chassis ground	Chassis ground	Chassis ground	Chassis ground	Chassis ground
5	Signal ground	Signal ground	Signal ground	Signal ground	Signal ground	Signal ground	Signal ground
6	ISO 15765 HS-CAN (+)	PCM	ISO 15765 HS-CAN(+)	Blinkcode	Blinkcode	TCM	ISO 15765 HS-CAN (+) (500kB)
7	ISO 9141 K-Line	n/a	ISO 9141 K-Line (engine)	K-Line, K1 (engine)	K-Line, K1 (engine)	K-Linie, K1 (engine)	n/a
8	Manufacturer mandated	CCM	n/a	K-Line, K4	K-Line (Saab 9000/1, KW81/82 Prot.)	n/a	reserved
9	Manufacturer mandated	first UART	Body ECU	reserviert	Saab Instruments (-)	ECM/TCM (GM8192 Prot.)	DW-FT-CAN (-) (<125kB)
10	J1850 (-) PWM	n/a	DW-FT-CAN (-)	n/a	n/a	n/a	n/a
11	Manufacturer mandated	EVA Controller	(Anti-Theft system)	reserved	L-Line Memory Seats	SIR	MS-CAN (-) (95kB)
12	Manufacturer mandated	ABS	engine compartment	K-Line, K3, ABS, TC, Steering, RTD, OW	n/a	ABS	K-Line (KW82 Prot.)
13	Manufacturer mandated	SIR	Luggage compartment	reserved f. K-Line, K5	n/a	ECM	reserved
14	ISO 15765 HS-CAN (-)	E&C	ISO 15765 HS-CAN (-)	reserved	n/a	n/a	ISO 15765 HS-CAN (-) (500kB)
15	ISO 9141 L-Line	n/a	n/a	n/a	n/a	n/a	n/a
16	Battery Plus, unswitched	Battery Plus, unswitched	Battery Plus, unswitched	Battery Plus, unswitched	Battery Plus, unswitched	Battery Plus, unswitched	Battery Plus, unswitched

Hinweis:

OBD-1 Diagnostic connectors see at OBD-1.

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Internal contacting Patch-Connector OBD2/RJ45

OBD-II (male) / RJ45 female, Order-No. ZUB-PS-SB

OBD-II Pin	Description	RJ45-Pin
2	J1850 Bus+	6
4, 5	Ground	1
6	CAN-Bus	7
7	ISO 9141-2 K-output	4
10	J1850 Bus	3
14	CAN-Bus	8
15	ISO 9141-2 L-output	5
16	Battery +12V	2

OBD-II (female) / RJ45 female, Order-No. ZUB-PS-BB

OBD-II Pin	Description	RJ45-Pin
2	J1850 Bus+	6
4, 5	Ground	1
6	CAN-Bus	7
7	ISO 9141-2 K-output	4
10	J1850 Bus	3
14	CAN-Bus	8
15	ISO 9141-2 L-output	5
16	Battery +12V	2

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OBD-II Cabel connection (for interfaces)

Order.-No. ZUB-VK-SB and ZUB-VK-SBA

OBD-Pin Description DB9-Pin 5 Signal ground 1 4 Chassis ground 2 6 CAN High (J-2284) 3 7 ISO 9141-2 K-output 4 14 CAN Low (J-2284) 5 10 J1850 Bus 6 2 J1850 Bus+ 7 15 ISO 9141-2 L-output 8 16 Battery +12V 9

Cable not intended for direct connection car to PC! Only for connecting an interface. See also at interface accessories

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Serial Connectors

DB9 connector Conector at PC/Laptop (male) DB9 Connector female Connector at cable (female)

Pin-No. Abbr. Description 1 CD Carrier Detect 2 RXD Receive Data 3 TXD Transmit Data 4 DTR Data Terminal Ready 5 GND System Masse 6 DSR Data Set Ready 7 RTS Request to Send 8 CTS Clear to Send 9 RI Ring Indicator

	DB25 Connector Connector at PC/Laptop (male) DB25 Connector female Connector Stecker at cable (female)	Pin-No. Abbr. Description 1 GND Ground shield 2 TXD Transmit Data 3 RXD Receive Data 4 RTS Request to Send 5 CTS Clear to Send 6 DSR Data Set Ready 7 GND System Masse 8 CD Carrier Detect 9 -- Reserved 10 -- Reserved 11 STF Select Transmit Channel 12 S.CD Secondary Carrier Detect 13 S.CTS Secondary Clear to Send 14 S.TXD Secondary Transmit Data 15 TCK Transmission Signal Element Timing 16 S.RXD Secondary Receive Data 17 RCK Receiver Signal Element Timing 18 LL Local Loop Control 19 S.RTS Secondary Request to Send 20 DTR Data Terminal Ready 21 RL Remote Loop Control 22 RI Ring Indicator 23 DSR Data Signal Rate Selector 24 XCK Transmit Signal Element Timing 25 TI Test Indicator
DB9 female/DB25 male Adapter Pin-No. Description Pin-No. 1 Carrier Detect 8 2 Receive Data 3 3 Transmit Data 2 4 Data Terminal Ready 20 5 System Masse 7 6 Data Set Ready 6 7 Request to Send 4 8 Clear to Send 5 9 Ring Indicator 22

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Nullmodem cable

DB9 connector female 1 Connector 1 at cable (female) DB9 connector female 2 Connector 2 at cable (female)

Abbr. D-Sub 1 D-Sub 2 Abbr. CD 1 4 DTR RXD 2 3 TXD TXD 3 2 RXD DTR 4 1 CD GND 5 5 GND RTS 7 8 CTS CTS 8 7 RTS RI 9 9 RI Shield - - Shield

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Nullmodem Mini-Adapter

DB9 connector front (male) DB9 connector back (male)

Abbr. D-Sub V D-Sub R Abbr. CD 1 4 DTR RXD 2 3 TXD TXD 3 2 RXD DTR 4 1 CD GND 5 5 GND RTS 7 8 CTS CTS 8 7 RTS RI 9-1 4 DTR Shield - - Shield

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USB connector

USB 1.1 max. length 3 meter

USB connector PC side USB connector device side

Pin-No. Abbr. Description 1 VBUS +5 VDC 2 D- Data - 3 D+ Data + 4 GND Masse

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Network connector, RJ45

RJ45 connector RJ45 connector female

Pin-No. Abbr. Description 10/100-Base 1 TX+ Transmit Data+ 2 TX- Transmit Data- 3 RX+ Receive Data+ 4 -- no contact 5 -- no contact 6 RX- Receive Data- 7 -- no contact 8 -- no contact

Pin-No.	Abbr.	1000-Base Line color
1	BI_DA+	white/orange
2	BI_DA-	orange
3	BI_DB+	white/green
4	BI_DC+	blue
5	BI_DC-	whiteeiß/blue
6	BI_DB-	green
7	BI_DD+	white/brown
8	BI_DD-	brown