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Driver's Multiplex Control Unit

  1. 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. Disconnect driver's multiplex control unit 22-pin connector. Inspect connectors and terminals. Check for bent, loose or corroded terminals. Perform driver's multiplex control unit input tests. See Fig 1 . Repair as necessary and recheck system operation. If driver's multiplex control unit inputs are okay, go to next step.
  2. Reconnect driver's multiplex control unit to underdash fuse/relay box. Perform input tests as specified at back side of driver's fuse/relay box (backprobe). See Fig 2 . Repair as necessary. If all tests are okay, reconnect driver's multiplex control unit 22-pin connector and go to PASSENGER'S MULTIPLEX CONTROL UNIT  .
Fig 1: Driver's Multiplex Control Unit Input Test (1 Of 2)
G99G50019Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig 2: Driver's Multiplex Control Unit Input Test (2 Of 2)
G99J50020Courtesy of AMERICAN HONDA MOTOR CO., INC.