Driver's Multiplex Control Unit Input
Turn ignition switch to OFF position. Remove driver's underdash fuse/relay box located under instrument panel. See DRIVER'S UNDERDASH FUSE/RELAY BOX under REMOVAL & INSTALLATION. Disconnect driver's multiplex control unit from underdash fuse/relay box. Disconnect driver's multiplex control unit connectors. Inspect connectors and terminals. Check for bent, loose or corroded terminals. Repair connector terminals as necessary and retest system. Perform driver's multiplex control unit input tests. See Fig 1 . If driver's multiplex control unit input tests are okay, replace faulty driver's multiplex control unit.