OBD2 pinout of GM, Ford, BMW, Honda, Nissan [Updated list]

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What are the pins on OBD2?

OBD2 connectors have 16 pins, which are numbered as the image below.

OBD2 pinout

The below is the general pinout of all vehicles that use the Onboard diagnostics 2 (OBD2) interface.

Pin 2, 4, 5, 6, 7, 10, 14, 15, 16 are standard across all 1996+ vehicles sold in the US

Pin 1, 3, 8, 9, 11, 12, 13 are manufacturer discretion, which means they are used for different purposes in different cars.

General OBD2 pinout

PinPin NameDescription
1,3,8,9,11,12,13BlankManufacturer discretion - different among cars
2SAE J1850 Bus+Commonly found on GM vehicles. This is the positive pin of the protocol.
10SAE J1850 Bus-Commonly found on GM vehicles. This is the positive pin of the protocol.
4,5GroundChassis ground and Signal ground
6CAN HighCAN ISO 15765-4 and SAE J2284
Used in 2008+ vehicles sold in the US
CAN protocol uses 2 wires to communicate, this is CAN high (CANH) wire.
14CAN LowCAN ISO 15765-4 and SAE J2284
Used in 2008+ vehicles sold in the US
CAN protocol uses 2 wires to communicate, this is CAN low (CANL) wire.
7ISO 9141 – K LineK-Line of ISO 9141-2 and ISO 14230-4
Common protocols for 2003+ vehicles and European vehicles between 2000 and 2004
15
ISO 9141 – L Line
L-Line of ISO 9141-2 and ISO 14230-4
Common protocols for European vehicles between 2000 and 2004
16Battery+Battery positive power

GM OBD2 pinout

The below tables are true with almost all modern GM vehicles (Chevrolet, GMC, Cadillac, Pontiac, Oldsmobile, Hummer, Saturn, Saab, etc.)

PinPin nameDescription
1J1850Second UART
2J1850(+) VPW
3Comfort
4GNDChassis ground
5SGNDSignal Ground
6HS-CANPCM
7K-LineK-Line of ISO 9141-2 and ISO 14230-4
8CCM
9first UART
10PWMn/c
11EVA controller
12ABS
13SIR
14HS-CAN(-)E&C
15L-LineL-Line of ISO 9141-2 and ISO 14230-4
16Battery+Power sourse

From 2004, GM started to use another pinout – GM-LAN. The protocol was first applied to Saturn Ion and 2004 Cadillac XLR. And eventually, GM-LAN has been used on other GM vehicles.

PinPin nameDescription
1SW-LS-CAN (33kB) or DW-FT-CAN (+) (<125kB)
2J1850N/A
3MS-CAN (+) (95kB)
4GNDChassis ground
5SGNDSignal Ground
6HS-CANISO 15765 HS-CAN (+) (500kB)
7K-LineN/A
8N/A
9DW-FT-CAN (-) (<125kB)
10PWMn/c
11MS-CAN (-) (95kB)
12K-Line (KW82 Prot.)
13Reserved
14 HS-CAN(-)ISO 15765 HS-CAN (-) (500kB)
15L-LineN/A
16 Battery+Battery positive power

Ford OBD2 pinout

PinPin nameCircuitDescription
2J1850 Bus+ / SCP BusBus 914 (TN/OG)ABS and others or not used
3Medium speed CAN+ or UBP bus2180 (WH/BK) or 1906 (VT)Low speed (125Kb) CAN bus. This bus used for some IC, RFA and other units.
4CGND57(BK)Chassis ground
5SGND570(BK/WH)Signal ground
6CAN High1827(WH/LB)High Speed CAN+
7K-LINE70(LB/WH)ISO Bus
10J1850 Bus-915(PK/LB)SCP bus-
11Medium speed CAN-2181(BK/YE)Low speed CAN-
13PCM107(P) / 107(VT)Power Train Control / Module programming signal
14CAN Low1828 (PK/LG)High Speed CAN-
16+12v40(LB/WH)Battery power

BMW OBD2 pinout

PinPin nameDescription
1+12VIgnition(in run or start)
4CGNDChassis ground
5SGNDSignal ground
6CANHCAN High, J-2284
7ISO 9141-2 K-LINEEngine (ISO-9141 and ISO-14230), automatic transmission diagnostic (in some models)
8ISO 9141-2 K-LINEIKE/KOMBI, ABS, ABS/ASR, ABS/ABD, ESP, DSC, Airbag and other electronic equipment
9TD/RPMEngine rotation speed
14CANLCAN Low, J-2284
15ISO 9141-2 L-LINEL-Line of ISO 9141-2 and ISO 14230-4
16+12vBattery power

Honda OBD2 pinout

PinPin nameDescription
4CGNDChassis ground
5SGNDSignal ground
6CAN HighJ-2284
7K-LINE(ISO 9141-2 and ISO/DIS 14230-4)
9SCSSCS (Service Check System) - diagnostic codes
12Programming out
13Input/Output for VTM-4 and immobilizer control
14CAN LowJ-2284 (WEN)
15ISO 9141-2 L-LINE(ISO 9141-2 and ISO/DIS 14230-4)
16+12vBattery power (unswitched)

Nissan OBD2 pinout

PinPin nameDescription
1CHECK
2J1850 Bus+
4CGNDChassis ground
5SGNDSignal ground
6CAN HighJ-2284
7K-LINEISO 9141-2 and ISO/DIS 14230-4
8Ignition ON
9ABS Anti-lock brake system
10J1850 Bus-
11Adjust Switch
12SCI TX
13SCI RX
14CAN LowJ-2284
15ISO 9141-2 L-LINEISO 9141-2 and ISO/DIS 14230-4
16+12vBattery power

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