LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Acura >> 2003 >> MDX Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 107 (Power Windows) >> Front Passenger's MPCS Unit Input Test
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Front Passenger's MPCS Unit Input Test

WARNING: This page is about a different car, the 2009 Acura MDX, 2008 Acura MDX, and 2007 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn the ignition switch to LOCK (0).
  2. Remove the front passenger's door panel (see FRONT DOOR PANEL REMOVAL/INSTALLATION ).
  3. Disconnect front passenger's MPCS unit (A) connectors A (28P) and B (14P).
    Fig 1: Identifying Front Passenger's MPCS Unit Connectors Terminals
    G05488048Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. 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 5.
  5. With the connectors still disconnected, make these input tests at the connectors.
    • 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 6.
    CAVITY AND TEST CONDITION CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    A4 GRY Under-dash fuse/relay box connector X (39P) and moonroof control unit/motor 10P connector disconnected Check for continuity between the A4 terminal and under-dash fuse/relay box connector X (39P) No. 15 terminal:
    There should be continuity.    		 An open in the wire
    Check for continuity to ground:
    There should be no continuity.    		 Short to ground in the wire
    A3 YEL Ignition switch ON (II), connect the A3 and B8 terminals with a jumper wire. Check the right rear power window motor operation:
    The motor should run (the power window should go down).
    • Blown No. 26 (30 A) fuse in the under-dash fuse/relay box
    • Poor ground (G606)
    • Faulty power window relay
    • Faulty right rear power window switch
    • Faulty right rear power window motor
    • An open in the wire
    A28 ORN Ignition switch ON (II), connect the A28 and B8 terminals with a jumper wire. Check the right rear power window motor operation:
    The motor should run (the power window should go up).
    B1 RED Connect the B8 and B1 terminals, and the B7 and B14 terminals with jumper wires. Check the front passenger's power window motor operation:
    The motor should run (the power window should go down).
    • Blown No. 26 (30 A) fuse in the under-dash fuse/relay box
    • Faulty front passenger's power window motor
    • An open in the wire
    B7 BLU Connect the B8 and B7 terminals, and the B1 and B14 terminals with jumper wires. Check the front passenger's power window motor operation:
    The motor should run (the power window should go up).
    A24
    - - -
    B2    		 WHT
    - - -
    LT BLU    		 Front passenger's power window switch in AUTO position Check for continuity between the terminals:
    There should be continuity.
    • Faulty front passenger's power window switch
    • An open in the wire
    Front passenger's power window switch released Check for continuity between the terminals:
    There should be no continuity.
    • Faulty front passenger's power window switch
    • A short to ground in the wire
    A24
    - - -
    B11    		 WHT
    - - -
    BRN    		 Front passenger's power window switch in DOWN position Check for continuity between the terminals:
    There should be continuity.
    • Faulty front passenger's power window switch
    • An open in the wire
    Front passenger's power window switch released Check for continuity between the terminals:
    There should be no continuity.
    • Faulty front passenger's power window switch
    • A short to ground in the wire
    A24
    - - -
    B13    		 WHT
    - - -
    WHT    		 Front passenger's power window switch in UP position Check for continuity between the terminals:
    There should be continuity.
    • Faulty front passenger's power window switch
    • An open in the wire
    Front passenger's power window switch released Check for continuity between the terminals:
    There should be no continuity.
    • Faulty front passenger's power window switch
    • A short to ground in the wire
    A22
    - - -
    B10    		 BLK
    - - -
    RED    		 Front passenger's power window switch in DOWN position Check for continuity between the terminals:
    There should be continuity.
    • Faulty front passenger's power window switch
    • An open in the wire
    Front passenger's power window switch released Check for continuity between the terminals:
    There should be no continuity.
    • Faulty front passenger's power window switch
    • A short to ground in the wire
    B10
    - - -
    B12    		 RED
    - - -
    GRN    		 Under all condition (except pressing the front passenger's power window switch DOWN position) Check for continuity between the terminals:
    There should be continuity.
    • Faulty front passenger's power window switch
    • An open in the wire
    Front passenger's power window switch in DOWN position Check for continuity between the terminals:
    There should be no continuity.
    • Faulty front passenger's power window switch
    • A short to ground in the wire
  6. Reconnect the connectors, and make these input tests at the connectors.
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, replace the front passenger's MPCS unit, then go to step 7.
    CAVITY AND TEST CONDITION CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    A7 BLK Under all conditions Measure the voltage to ground:
    There should be less than 0.5 V.
    • Poor ground (G506)
    • An open in the wire
    B14 BLK Under all conditions Measure the voltage to ground:
    There should be less than 0.5 V.
    • Poor ground (G507)
    • An open in the wire
    A2 WHT Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 4 (40 A) fuse in the main under-hood fuse box
    • Blown No. 7 (10 A) fuse in the under-dash fuse/relay box
    • Faulty under-dash fuse/relay box
    • An open in the wire
    B8 GRN Under all conditions Measure the voltage to ground:
    There should be, battery voltage.
    • Blown No. 3 (P/W) (50 A) fuse in the main under-hood fuse box
    • Blown No. 26 (30 A) fuse in the under-dash fuse/relay box
    • An open in the wire
    B3 GRN Ignition switch ON (II) Measure the voltage to ground:
    There should be battery voltage.
    • Faulty front passenger's MPCS unit
    • An open in the wire
    B4 ORN Ignition switch ON (II), and front passenger's power window motor runs by connecting the B8 and B1 terminals and the B7 and B14 terminals with jumper wires. Measure the voltage between the B4 and B6 terminals:
    There should be 0-about 5 V -.0- about 5 V repeatedly (a digital voltmeter reads about 2.5 V while the power window moves).
    • Blown No. 26 (30 A) fuse in the under-dash fuse/relay box
    • Faulty front passenger's MPCS unit
    • Faulty front passenger's power window motor
    • An open in the wire
    B5 LT GRN Ignition switch ON (II), and front passenger's power window motor runs by connecting the B8 and B1 terminals and the B7 and B14 terminals with jumper wires. Measure the voltage between the B5 and B6 terminals:
    There should be 0-about 5 V - 0- about 5 V repeatedly (a digital voltmeter reads about 2.5 V while the power window moves).
    • Blown No. 26 (30 A) fuse in the under-dash fuse/relay box
    • Faulty front passenger's MPCS unit
    • Faulty front passenger's power window motor
    • An open in the wire
    B6 GRY Ignition switch ON (II) Check for continuity to ground:
    There should be continuity.
    • Poor ground (G506, G507)
    • Faulty front passenger's MPCS unit
    • An open in the wire
  7. Reset the power window control unit (see RESETTING THE POWER WINDOW CONTROL UNIT  ).
scientia non olet · About LEMON Manuals