Multiplex Control Unit Input: 3.5RL
Remove driver's underdash fuse/relay box. See DRIVER'S UNDERDASH FUSE/RELAY BOX under REMOVAL & INSTALLATION. Remove driver's multiplex control unit from driver's underdash fuse/relay box. Inspect connectors and terminals. Check for bent, loose, or corroded terminals. Perform driver's multiplex control unit input test "A". See Fig 1 . Disconnect multiplex control unit connectors. Perform driver's multiplex control unit input test "B". See Fig 2 . Repair as necessary and recheck system operation. If driver's multiplex control unit inputs are okay, multiplex control unit may have an intermittent problem. Replace multiplex control unit and recheck system.