OBD-II Connectors
The OBD-II data link connector (post-1996 light duty vehicles) is a standardized diagnostic connection for communicating Parameter IDs (PIDs) from a vehicle to a diagnostic tool.
Light Duty (passenger cars and trucks) OBD-II Connectors (Type A and B)
The SAE J1962 specification provides for two standardized hardware interfaces, called type A and type B. Both are female, 16-pin (2x8), D-shaped connectors, and both have a groove between the two rows of pins. Type B has an interrupted groove in the middle, so it isn't possible to plug a type A male connector into a type B socket. It is possible, however, to mate a type B male plug to a type A female socket. The type A connector is used for vehicles that use 12V system, whereas type B is used for 24V vehicles and it is required to mark the front of the D-shaped area in blue color.
OBD-II Connector Parts
OBD-II compatible connectors are available from a variety of manufacturers:
| Image | Part Number | Manufacturer | Gender | Type | Mounting Style | Series | Catalog / Datasheet | Mouser Link |
|---|---|---|---|---|---|---|---|---|
 |
12110250 | Aptiv | Female | A | Fastener mount | Aptiv Metri-Pack 150 | Aptiv Metri-Pack 150 OBD Catalog | Mouser |
 |
12185280 | A | Panel mount | Mouser | ||||
| 51115‑1601 | Molex | Female | A | Panel mount | Molex OBD‑II Series | Datasheet | Mouser | |
| 7183766530 | Yazaki | Female | A | Panel mount | Yazaki OBD-II Series | Datasheet | Mouser |
| Part Number | Manufacturer | Gender | Series | Applicable wire size | Plating | Catalog / Datasheet | Mouser Link |
|---|---|---|---|---|---|---|---|
| 12129373 | Aptiv | Female | Aptiv Metri-Pack 150 | 0.5 - 0.35 mm2 | Tin | Datasheet | Mouser |
| 12129484 | 1.0 - 0.8 mm2 | Tin | Mouser | ||||
| 13525297 | 0.5 - 0.35 mm2 | Gold | Datasheet | Mouser | |||
| 50420‑8000 | Molex | Female | Tin | Mouser | |||
| 7116154602 | Yazaki | Female | Tin |
| Image | Part Number | Manufacturer | Type | Color | Gender | Series | Catalog / Datasheet | Mouser Link |
|---|---|---|---|---|---|---|---|---|
 |
12110252 | Aptiv | A | Red | Male | Aptiv Metri-Pack 150 | Aptiv Metri-Pack 150 OBD Catalog | Mouser |
 |
685031602 | Molex | A | Black | Male | Molex OBD‑II Series | Datasheet | Mouser |
| Image | Part Number | Manufacturer | Gender | Series | Catalog / Datasheet | Mouser Link |
|---|---|---|---|---|---|---|
OBD-II Pinout
| Pin # | Function / Description |
|---|---|
| 1 | Manufacturer-specific |
| 2 | SAE J1850 Bus+ (VPW/PWM) |
| 3 | Manufacturer-specific |
| 4 | Chassis ground |
| 5 | Signal ground |
| 6 | CAN High (ISO 15765‑4) |
| 7 | K‑Line (ISO 9141‑2 / ISO 14230‑4 KWP2000) |
| 8 | Manufacturer-specific |
| 9 | Manufacturer-specific |
| 10 | SAE J1850 Bus– (PWM only) |
| 11 | Manufacturer-specific |
| 12 | Manufacturer-specific |
| 13 | Manufacturer-specific |
| 14 | CAN Low (ISO 15765‑4) |
| 15 | L‑Line (ISO 9141‑2 / older KWP) |
| 16 | Battery power (unswitched +12V) |
PIDs / Codes
SAE standard J1979 defines many OBD-II PIDs. All on-road vehicles and trucks sold in North America are required to support a subset of these codes, primarily for state mandated emissions inspections. Manufacturers also define additional PIDs specific to their vehicles. Though not mandated, many motorcycles also support OBD-II PIDs.
Heavy Duty OBD-II Connectors
Heavy duty vehicles (greater than 14,000 lb or 6,400 kg) made after 2010, for sale in the US are allowed to support OBD-II diagnostics through SAE standard J1939-13 (a round diagnostic connector) according to CARB in title 13 CCR 1971.1. Some heavy duty trucks in North America, however, use the SAE J1962 OBD-II diagnostic connector that is common with light duty vehicles, notably Mack and Volvo Trucks.
