Cars and bikes interfaces
SAE J1708 is a standard used for serial communications between ECUs on a heavy duty vehicle and also between a computer and the vehicle.

With respect to Open System Interconnection model (OSI), J1708 defines the physical layer.

Common higher layer protocols that operate on top of J1708 are SAE J1587 and SAE J1922.

Pin
Number
Pin
 
Description
A   KL31   battery(-)
B   KL15   ignition (10A fuse)
C   CAN-H   
D   CAN-L   
E   J1939 GND   CAN ground
F   J1708+   
G   J1708-  

H,J are not connected

A and B are twisted in cable

C and D are twisted in cable

F and G are twisted in cable

9 pin J1930 connector layout
9 pin J1930 connector
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SAE J1708 9 pin deutsch connector visual pinout:
SAE J1708 9 pin deutsch connector diagram
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