DTC 3

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