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Home >> Acura >> 2003 >> MDX Base >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Multiplex Control System >> Multiplex Control Unit Input Test >> Door Unit
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Door Unit

  1. Carefully pry off the driver's door switch trim (see FRONT DOOR PANEL REMOVAL/INSTALLATION ).
  2. Disconnect the connectors (A).
    Fig 1: Disconnecting Connectors
    G03642327Courtesy of AMERICAN HONDA MOTOR CO., INC.
  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.
  4. Make the following input tests at connector A (20P).
    • 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 1 in DRIVER'S UNIT  .
    MULTIPLEX CONTROL UNIT INPUT TEST (DOOR UNIT)

    Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
    A1 WHT/RED Under all conditions Check for voltage to ground:
    There should be battery voltage.
    • Blown No. 13 (7.5 A) fuse in the passenger's under-dash fuse/relay box
    • Blown No. 54 (40 A) fuse in the under-hood fuse/relay box
    • An open in the wire
    A2 GRN/WHT Ignition switch ON (II) and passenger's multiplex terminal A12 connected to battery voltage Check for voltage to ground on A2:
    There should be battery voltage.
    • Blown No. 15 (20 A) fuse in the passenger's under-dash fuse/relay box
    • Faulty power window relay
    • An open in the wire
    A12(1) Fuse/relay box socket
    A12 BLK Under all conditions Check for continuity to ground:
    There should be continuity.
    • Poor ground (G401)
    • An open in the wire
    B1 BLK Under all conditions Check for continuity to ground:
    There should be continuity.
    • Poor ground (G601)
    • An open in the wire
    (1) Passenger's multiplex control unit connector A
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