ContactGeneral allocation
1
*
2
Bus positive line of SAE J1850
3
*
4
Chassis ground
5
Signal ground
6
CAN-High line of ISO 15765-4
7
К-line of ISO 9141-2 and ISO 14230-4
8-9
*
10
Bus negative line of SAE J1850
11-13
*
14
CAN-Low line of ISO 15765-4
15
L-line of ISO 9141-2 and ISO 14230-4
16
Permanent positive voltage
* - Discretionary (OEM)

By default K+CAN Commander 1.4 and ELM327 adapters use pin 7 in OBD-II Diagnostic Link Connector to communicate with Engine Control Unit via K-line. This is default pin for K-line interface, as described in SAE J1962. Assignment of contacts 1,3,8,9,11,12 and 13 in the vehicle connector is left to the discretion of the vehicle manufacturer. Diagnostic interfaces of other Control Units may be connected to these contacts, such as Transmission Control Unit, ABS/ESP Unit, Climate Control Unit and so on.

In some cases, it is possible to unite K-lines directly in the diagnostic adapter using simple jumpers. This is allowed when diagnosing only a specific car model and if you know which diagnostic K-lines can be joined together. In most cases, it is recommended to use a K-line switch to diagnose different control units via K-line.

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