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Control Unit Input Test

  1. Before testing the wiper/washer control functions, troubleshoot the multiplex control system (see MULTIPLEX CONTROL SYSTEMS article).

    Multiplex Control Unit, Driver's: 

  2. Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box, and disconnect its connector.
  3. Inspect all connector and socket terminals to be sure they are making good contact.
    • If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
    • If the terminals look OK, go to step 4.
    Fig 1: Identifying Fuse/Relay Box Socket Terminals
    G01157082Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 2: Identifying Multiplex Control Unit, Driver's Connector B Terminals
    G01157083Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. With the driver's multiplex control unit still disconnected, make these input tests at the connector and driver's under-dash fuse/relay box sockets.
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, go to step 5.
    Fig 3: Driver's Multiplex Control Unit Input Test Chart
    G01157084Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Multiplex Control Unit, Passenger's: 

  5. Remove the passenger's under-dash fuse/relay box .
  6. Remove the passenger's multiplex control unit from the passenger's under-dash fuse/relay box, and disconnect its connector.
  7. Inspect all connector and socket terminals to be sure they are making good contact.
    • If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
    • If the terminals look OK, go to step 8.
    Fig 4: Identifying Fuse/Relay Box Socket Terminals
    G01157085Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 5: Identifying Multiplex Control Unit, Passenger's Connector Terminals
    G01157086Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. With the passenger's multiplex control unit still disconnected, make these input tests at the connector and the passenger's under-dash fuse/relay box sockets.
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, the control unit must be faulty; replace it.
    Fig 6: Passenger's Multiplex Control Unit Input Test Chart
    G01157087Courtesy of AMERICAN HONDA MOTOR CO., INC.
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