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Door Multiplex Control Unit Input Test

NOTE: Check the No. 22 (120 A), No. 23 (50 A), No. 15 (40 A) fuse in the under-hood fuse/relay box before troubleshooting.
  1. Before troubleshooting the multiplex integrated control system, troubleshoot the B-CAN System Diagnosis Test mode A (see Troubleshooting - B-CAN System Diagnosis Test Mode A ).
  2. Turn the ignition switch OFF.
  3. Remove the power window master switch (see PASSENGER'S POWER WINDOW MOTOR TEST ).
  4. Disconnect the 23P connector from the power window master switch.
    Fig 1: Identifying Door Multiplex Control Unit Connector Terminals
    G03691060Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. 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  6.
  6. With the connector still disconnected, make these input tests at the connector.
    • If the test indicates a problem, find and correct the cause, then recheck the system.
    • If the terminals look OK, go to step  7.
    Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
    16 BRN/BLK Under all conditions Check for continuity between No. 16 terminal and the under-dash fuse/relay box connector J (21P) No. 4 terminal:
    There should be continuity.    		 An open in the wire
  7. Reconnect the connector to the door multiplex control unit and 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, the door multiplex control unit must be faulty, replace the power window master switch.
      TEST CONDITION (4 OF 6)

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      1 BLK Under all conditions Check for voltage to ground:
      There should be less than 1 V.
      • Poor ground (G501)
      • An open in the wire
      15 WHT/RED Under all conditions Check for voltage to ground:
      There should be battery voltage.
      • Blown No. 7 (7.5 A) fuse in the under-dash fuse/relay box
      • An open in the wire
      20 YEL Ignition switch ON (II) Check for voltage to ground:
      There should be battery voltage.
      • Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box
      • An open in the wire
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