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Multiplex Control Unit: 3.5RL

  1. Remove driver's underdash fuse/relay box. See DRIVER'S UNDERDASH FUSE/RELAY BOX (3.5RL)  under REMOVAL & INSTALLATION. Remove driver's multiplex control unit from driver's underdash fuse/relay box. Disconnect control unit connectors. 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. Remove driver's door panel. See DOOR PANEL  under REMOVAL & INSTALLATION. Remove driver's door multiplex control unit (built into power window switch). Disconnect control unit connector. Inspect connectors and terminals. Check for bent, loose or corroded terminals. Perform first part of driver's door multiplex control unit input test. See Fig 2 . Repair as necessary and recheck system operation. If driver's door multiplex control unit tests are okay, go to next step.
  3. Reconnect driver's door multiplex control unit connector. Perform second part of driver's door multiplex control unit input test at back of driver's door multiplex control unit connector (backprobe). See Fig 2 . Repair as necessary. If all tests are okay, go to next step.
  4. Remove passenger's multiplex control unit from behind right kick panel. Disconnect control unit connectors. Inspect connectors and terminals. Check for bent, loose or corroded terminals. Perform first part of passenger's multiplex control unit input test. See Fig 3 . Repair as necessary and recheck system operation. If passenger's multiplex control unit inputs are okay, go to next step.
  5. Reconnect passenger's multiplex control unit. Perform second part of input test at back of passenger's multiplex control unit connectors (backprobe). See Fig 3 . Repair as necessary. If all tests are okay, go to next step.
  6. If all tests have proven okay, power window master switch must be faulty. Replace power window master switch and recheck system operation.
Fig 1: Driver's Multiplex Power Window Control Unit Test (3.5RL)
G99C50114Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig 2: Driver's Door Multiplex Control Unit Test (3.5RL)
G99D50115Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig 3: Passenger's Multiplex Control Unit Test (3.5RL)
G99E50116Courtesy of AMERICAN HONDA MOTOR CO., INC.
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