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HOMESERVICE MANUALSACURA2008MDXREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 61 (MULTIPLEX CONTROL SYSTEM)MULTIPLEX CONTROL UNIT INPUT TESTDOOR UNIT
2008 Acura MDX

Door Unit

2008 Acura MDXSECTION Door Unit
WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
  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
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.