Key to diagram: A20 CCU module A30 Terminal XT1 Terminal connector XT2 Tractor connector, 9-pin (acc. to ISO standard) Electric System Liner 3000 with Communicator TIC 6b-2 Lin-06-el. 12/03 06b - CAN bus, power supply of modules Circuit diagram without „Basic tractor equipment“ retrofit kit (2-pin power supply socket)