Dash Lights Brightness Controller Input Test: Notes

Check multiplex control system fuses, power and grounds. Check multiplex control system for Diagnostic Trouble Codes (DTCs). Check multiplex control system wake-up function. See SYSTEM TESTING in MULTIPLEX CONTROL SYSTEMS - PRELUDE article. If problem exists, repair indicated fault. If problem does not exist, check driver's multiplex control unit. See DRIVER'S MULTIPLEX CONTROL UNIT  . If problem exists, repair indicated fault. If problem does not exist, check passenger's multiplex control unit. See PASSENGER'S MULTIPLEX CONTROL UNIT  .