Key to diagram: A20 CCU module A30 Terminal XT1 Terminal connector XT2-1 Tractor connector, 9-pin (acc. to ISO standard) XT2-2 Implement connector, 9-pin (acc. to ISO standard) Electric System Liner 3000 with Communicator TIC 6a-2 Lin-06-el. 12/03 06a - CAN bus, power supply of modules Circuit diagram with „Basic tractor equipment“ retrofit kit (ISO socket)