ISO 12098 is a standard for electrical trailer connectors used in the commercial vehicle industry. It has been developed as a replacement for the standards ISO 1185 and ISO 3731. The 15-pin system can transfer the same functionalities between towing vehicle and trailer as the prior system using only a single plug and socket connection. Additionally, it includes two data lines (CAN-H and CAN-L) according to ISO 11992-3 for the data interchange of equipment other than braking systems and running gear (which is covered by the ABS/EBS connector system according to ISO 7638-1).

The standard ISO 12098 specifies

• the dimensional characteristics of 15-pin connectors for the electrical connection of equipment other than braking systems and running gear used in towing and towed vehicles with 24 V nominal supply voltage
• the contact allocation as well as tests and requirements for the trailer connector system
• a park socket for receiving and storing the plug when it is disconnected
• a means of adaptation between 7- and 15-pin connectors