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Power Window Control Unit Input Test

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. Remove the driver's door panel (see FRONT DOOR PANEL REMOVAL/INSTALLATION ).
  2. Disconnect the 18P connector (A) from the power window control unit (B).
    Fig 1: Disconnecting 18P Connector From Power Window Control Unit
    G03642341Courtesy 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. With the connector still disconnected, make these input tests at the connectors.
    • If any test indicates a problem, find and correct, then recheck the system.
    • If all the input tests prove OK, go to step 5.
      POWER WINDOW CONTROL UNIT INPUT TEST (CONNECTOR DISCONNECTED)

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      1 BLK Under all conditions Check for continuity to ground: There should be continuity.
      • Poor ground (G601)
      • An open in the wire
      8 WHT/BLU Under all conditions(1) Check for voltage to ground on terminal 7: There should be battery voltage.
      • Blown No. 8 (20 A) fuse in the under-hood subfuse box
      • An open in the wire
      7 GRN/WHT Ignition switch ON (II) and passenger's multiplex terminal A12 connected to battery voltage Check for voltage to ground: 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(2) Fuse/relay box cavity
      13 BLK/WHT Ignition switch ON (II) and driver's window switch UP Check for voltage to ground: There should be battery voltage.
      • Faulty power window master switch
      • An open in the wire
      11 YEL/GRN Ignition switch ON (II) and driver's window switch AUTO UP
      Ignition switch ON (II) and driver's window switch AUTO DOWN
      15 BLU/ORN Ignition switch ON (II) and driver's window switch DOWN
      4 BLU/GRN Driver's window switch DOWN Check for continuity to ground: There should be continuity.
      • Poor ground (G401, G601)
      • Faulty power window master switch
      • An open in the wire
      4 BLU/GRN Driver's window switch OFF Check for continuity between the No. 4 and No. 14 terminals: There should be continuity.
      • Faulty power window master switch
      • An open in the wire
      14 BLU/ORN
      3 RED Connect the battery power to the No. 12 (+) and ground the No. 3 (-) terminals Check the driver's window motor: It should run (the window moves down).
      • Faulty power window motor
      • An open in the wire
      12 GRN Connect the battery power to the No. 3 (+) and ground the No. 12 (-) terminals Check the driver's window motor: It should run (the window moves up).
      • Faulty power window motor
      • An open in the wire
      (1) Make sure the driver's door harness is connected
      (2) Passenger's multiplex control unit connector A
  5. Reconnect the 18P connector to the power window control unit and reconnect the passenger's multiplex control unit, then 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 control unit must be faulty; replace it.
      POWER WINDOW CONTROL UNIT INPUT TEST (CONNECTORS RECONNECTED)

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      17 GRN/YEL Ignition switch ON (II) Check for voltage between the No. 17 (+) and No. 9 (-) terminals: There should be battery voltage.
      • Faulty power window motor
      • Faulty pulser
      • An open in the wire
      • Faulty power window control unit
      9 YEL/BLU
      5 GRN/RED While operating the driver's window switch Check for voltage between the No. 5 (+) and No. 9 (-) terminals: There should be pulse voltage 0-5 V (an analog voltmeter needle should move back and forth alternately; a digital voltmeter should show the average voltage of about 2.5 V).
      16 YEL/WHT While operating the driver's window switch Check for voltage between the No. 16 (+) and No. 9 (-) terminals: There should be pulse voltage 0-5 V (an analog voltmeter needle should move back and forth alternately; a digital voltmeter should show the average voltage of about 2.5 V).
      17 GRN/YEL Ignition switch ON (II) Check for voltage between terminal No. 17 and body ground: There should be battery voltage.
      • Faulty power window control unit
      • Short to ground
      • Faulty power window motor
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