LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Acura >> 2009 >> TSX Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 45 (Multiplex Integrated Control System) >> Door Multiplex Control Unit Input Test
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Door Multiplex Control Unit Input Test

WARNING: This page is about a different car, the 2008 Acura TSX, 2007 Acura TSX, 2006 Acura TSX, 2005 Acura TSX, and 2004 Acura TSX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the driver's door switch panel (see FRONT DOOR PANEL REMOVAL/INSTALLATION ).
  2. Disconnect the 23P connector from the power window master switch.
    Fig 1: Identifying Door Multiplex Control Unit Connector (23P) Terminals
    G05492799Courtesy 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. Reconnect the connector to the power window master switch, 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, go to step 5.
      INPUT TEST CONDITION REFERENCE CHART

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      1 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V.
      • Poor ground (G501, G601)
      • An open in the wire
      10 GRN/WHT Under all conditions Measure the voltage to ground: There should be battery voltage.
      • Blown No. 27 (20 A) fuse in the under-dash fuse/relay box
      • An open in the wire
      20 YEL Ignition switch ON (II) Measure the 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
  5. Disconnect the 23P connector from the power window master switch, 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.
      INPUT TEST CONDITION REFERENCE CHART

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      16 BRN/RED Under-dash fuse/relay box connector J (21P) disconnected Check for continuity between terminal 16 and the under-dash fuse/relay box connector J (21P) connector No. 4 terminal: There should be continuity. An open in the wire
      Check for continuity to ground: There should be no continuity. Short to ground
scientia non olet · About LEMON Manuals