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Control Unit Input Test

  1. Before testing the keyless entry/power door lock control functions, troubleshoot the multiplex control system (see TROUBLESHOOTING ).
    1. Driver's Multiplex Control Unit 
  2. Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box.
  3. Inspect the connector and socket terminals to be sure they are all 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: Inspecting Connecting & Socket Terminals
    G01520265Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. With the driver's multiplex control unit still disconnected, make these input tests at the connector and 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 2: Connector And Fuse/Relay Box Socket Input Tests (Driver's Multiplex Control Unit Disconnected)
    G01520266Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Reconnect the driver's multiplex control unit to the fuse/relay box, and perform the following input tests at the appropriate connectors on the back of the fuse/relay box .
    • 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 6.
    Fig 3: Connector And Fuse/Relay Box Socket Input Tests (Driver's Multiplex Control Unit Connected)
    G01520267Courtesy of AMERICAN HONDA MOTOR CO., INC.
    1. Passenger's Multiplex Control Unit 
  6. Remove the passenger's multiplex control unit from the passenger's under-dash fuse/relay box, and disconnect its connector.
  7. Inspect the connector and socket terminals to be sure they are all 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: Inspecting Connector & Socket Terminals (1 Of 2)
    G01520268Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 5: Inspecting Connector & Socket Terminals (1 Of 2)
    G01520269Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. With the multiplex control unit still disconnected, make these input tests at the connector and 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 9.
    Fig 6: Connector And Fuse/Relay Box Socket Input Tests (Passenger's Multiplex Control Unit Disconnected)
    G01520270Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. Reconnect the passenger's multiplex control unit to the fuse/relay box, and perform the following input tests at the appropriate connectors on the back of the fuse/relay box (see PASSENGER'S UNDER-DASH FUSE/RELAY BOX ).
    • 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 10.
    Fig 7: Connector And Fuse/Relay Box Socket Input Tests (Passenger's Multiplex Control Unit Connected)
    G01520271Courtesy of AMERICAN HONDA MOTOR CO., INC.
    • Door Multiplex Control Unit 
  10. Remove the door multiplex control unit, and disconnect its connector.
  11. Inspect the 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 12.
    Fig 8: Inspecting Connector & Socket Terminals
    G01520272Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. With the door unit still disconnected, make these input tests at the connector.
    • 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 13.
    Fig 9: Connector And Fuse/Relay Box Socket Input Tests (Door Multiplex Control Unit Disconnected)
    G01520273Courtesy of AMERICAN HONDA MOTOR CO., INC.
  13. Reconnect the connector to the door unit, and perform the following input tests at the connectors.
    • 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 14.
    Fig 10: Connector And Fuse/Relay Box Socket Input Tests (Door Multiplex Control Unit Connected)
    G01520274Courtesy of AMERICAN HONDA MOTOR CO., INC.
  14. If all the input tests prove OK, one of the control units must be faulty, Substitute a known-good control unit for the one that is most likely at fault, then recheck the system. If the system works properly, the original control unit is faulty; replace it. If there is still a malfunction, substitute a known-good control unit for the next most likely unit to be at fault, and recheck. If the system works properly, the original unit is faulty; replace it.
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