SAE J1962

OBD-II Connector Pinout (SAE J1962)

The SAE J1962 diagnostic socket has 16 positions. Select a contact to identify its standardized signal or see that the position is left to the vehicle manufacturer.

Before you wire

  • Pin 16 is an always-live battery supply and must be fused appropriately.
  • Do not assume a function for manufacturer-discretionary positions.
  • Identify the supported protocol before attaching interface electronics.

Pin assignment

Pin 1: OEM1Pin 2: J1850 Bus+2Pin 3: OEM3Pin 4: CGND4Pin 5: SGND5Pin 6: CAN-H6Pin 7: K-line7Pin 8: OEM8Pin 9: OEM9Pin 10: J1850 Bus−10Pin 11: OEM11Pin 12: OEM12Pin 13: OEM13Pin 14: CAN-L14Pin 15: L-line15Pin 16: BAT+16Pin 1: OEM1Pin 2: J1850 Bus+2Pin 3: OEM3Pin 4: CGND4Pin 5: SGND5Pin 6: CAN-H6Pin 7: K-line7Pin 8: OEM8Pin 9: OEM9Pin 10: J1850 Bus−10Pin 11: OEM11Pin 12: OEM12Pin 13: OEM13Pin 14: CAN-L14Pin 15: L-line15Pin 16: BAT+16
  • Manufacturer-defined
  • J1850 (legacy)
  • Ground
  • CAN bus
  • K-line (ISO 9141 / KWP2000)
  • Power

Schematic face view, not to scale · numbering per SAE J1962

Pin assignment of OBD-II Connector
PinSignalFunctionStatus
OEMManufacturer discretionary (e.g. GM single-wire CAN)Discretionary
J1850 Bus+J1850 Bus+ (PWM and VPW)Standard
OEMDiscretionary (e.g. Ford MS-CAN+)Discretionary
CGNDChassis groundStandard
SGNDSignal groundStandard
CAN-HCAN High (ISO 15765-4)Standard
K-lineISO 9141-2 / ISO 14230-4 K-lineStandard
OEMManufacturer discretionaryDiscretionary
OEMManufacturer discretionaryDiscretionary
J1850 Bus−J1850 Bus− (PWM only)Standard
OEMDiscretionary (e.g. Ford MS-CAN−)Discretionary
OEMManufacturer discretionaryDiscretionary
OEMManufacturer discretionaryDiscretionary
CAN-LCAN Low (ISO 15765-4)Standard
L-lineISO 9141-2 / ISO 14230-4 L-lineStandard
BAT+Battery positive (12 V; 24 V on heavy vehicles), stays live with the vehicle offStandard

Pin details

Select a pin on the diagram or table for full details.

Pin details

About this connector

SAE J1962 defines the 16-position diagnostic connector used for OBD communication between a vehicle and test equipment. The connector can expose CAN, legacy diagnostic buses, grounds, battery power and manufacturer-discretionary positions.

Notes

  • The diagram is a view into the vehicle-side socket.

Common use cases

  • Vehicle fault-code and live-data diagnostics
  • Connecting a compliant scan tool
  • Read-only vehicle telemetry with protocol-aware hardware

Specifications

Standard
SAE J1962
Positions
16

Primary sources

CAN, grounds and power

Modern diagnostics commonly use CAN on pins 6 and 14. Pin 4 is chassis ground, pin 5 is signal ground and pin 16 is an always-live battery supply. Treat the two grounds according to their assigned purpose and protect any connection to pin 16 with appropriate current limiting or a fuse.

Manufacturer-discretionary pins

Pins 1, 3, 8, 9 and 11–13 are not assigned a universal diagnostic signal by this layout. A manufacturer may use them for another network or leave them unused. Never infer a signal from the connector position alone; consult service information for the exact vehicle.

Legacy diagnostic protocols

Pins 2 and 10 carry SAE J1850 on vehicles that implement it. Pin 7 is the ISO 9141-2 or ISO 14230-4 K-line, and pin 15 is the optional L-line. These older protocols are not expected on every vehicle and must not be confused with the CAN pair.

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