Please use our menu and pictures to locate your cars OBD-II connector.
The OBD-II standard specifies the type of diagnostic connector and its pinout, the electrical signalling protocols available, and the messaging format.
It also provides a candidate list of vehicle parameters to monitor along with how to encode the data for each.
There is also a pin in the connector that provides power for the scan tool in use and is powered from the vehicles battery, which eliminates the need to connect a scan tool to a power source separately.
The OBD-II standard provides an extensible list of DTCs amongst other data also provided by this connection.
As a result of this standardization, a single device can query the cars on-board computer(s) in any vehicle. This OBD-II came in two models OBD-IIA and OBD-IIB. OBD-II standardization was prompted by emissions requirements, and though only emission-related codes and data are required to be transmitted through it, most manufacturers have made the OBD-II Data Link Connector the only one in the vehicle through which all systems are diagnosed and programmed.
OBD-II Diagnostic Trouble Codes are 4-digit and are preceded by a letter: P for engine and transmission (powertrain), B for body, C for chassis, and U for network or CAN.
The OBD-II specification provides for a standardized hardware interface via the female 16-pin (2×8) J1962 connector, the OBD-II connector is required to be within 2 feet (0.61 m) of the steering wheel (unless an exemption is applied for by the manufacturer, in which case it is still somewhere within reach of the driver).
| 1 | Manufacturer discretion – GM: J2411 GMLAN/SWC/Single-Wire CAN[12] VW/Audi: Switched +12 to tell a scan tool whether the ignition is on. Ford: Infotainment CAN High[12] |
9 | Manufacturer discretion – GM: 8192 bit/s ALDL where fitted. Ford: Infotainment CAN-Low |
|---|---|---|---|
| 2 | Bus Positive Line of SAE J1850 PWM and VPW | 10 | Bus Negative Line of SAE J1850 PWM only (not SAE J1850 VPW) |
| 3 | Manufacturer discretion – Ford: DCL(+) Argentina, Brazil (pre OBD-II) 1997-2000, USA, Europe, etc. Ford: Medium Speed CAN-High[12] Chrysler: CCD Bus(+)[12] |
11 | Manufacturer Discretion – Ford: DCL(-) Argentina, Brazil (pre OBD-II) 1997-2000, USA, Europe, etc. Ford: Medium Speed CAN-Low[12] Chrysler: CCD Bus(-)[12] |
| 4 | Chassis ground | 12 | Manufacturer discretion – |
| 5 | Signal ground | 13 | Manufacturer discretion – Ford: FEPS – Programming PCM voltage |
| 6 | CAN-High (ISO 15765-4 and SAE J2284) | 14 | CAN-Low (ISO 15765-4 and SAE J2284) |
| 7 | K-Line of ISO 9141-2 and ISO 14230-4 | 15 | L-Line of ISO 9141-2 and ISO 14230-4 |
| 8 | Manufacturer discretion – BMW: Second K-Line for non OBD-II (Body/Chassis/Infotainment) systems. |
16 | Battery voltage |