DTC 2

Check communication line between driver's multiplex control unit and passenger's multiplex control unit. See DRIVER'S MULTIPLEX CONTROL UNIT-TO-PASSENGER'S MULTIPLEX CONTROL UNIT  in COMMUNICATION LINES under SYSTEM TESTS. If communication line is okay, check driver's multiplex control unit operation. See DRIVER'S MULTIPLEX CONTROL UNIT INPUT  under SYSTEM TESTS. If driver's multiplex control unit is okay, check passenger's multiplex control unit operation. See PASSENGER'S MULTIPLEX CONTROL UNIT INPUT  under SYSTEM TESTS. Repair or replace as necessary.