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HOMESERVICE MANUALSACURA2008RLREPAIR AND DIAGNOSISBODY & FRAMEWINDOWSPOWER WINDOWSDRIVER'S MPCS UNIT INPUT TEST
2008 Acura RL

Driver's MPCS Unit Input Test

2008 Acura RLSECTION Driver's MPCS Unit Input Test
  1. Turn the ignition switch OFF.
  2. Remove the driver's door panel (see FRONT DOOR PANEL REMOVAL/INSTALLATION ).
  3. Disconnect driver's MPCS unit (A) connectors A (40P) and B (14P).
    Fig 1: Identifying MPCS Unit Connectors (40P) And (14P)
    G05497074Courtesy 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.
    TEST CONDITION AND POSSIBLE CAUSE REFERENCE CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    A8 GRY Driver's under-dash fuse/relay box connector H (14P) and power window master switch 6P connector disconnected Check for continuity between the A8 terminal and driver's under-dash fuse/relay box connector H (14P) No. 4 terminal, and A8 terminal and power window master switch 6P connector No. 6 terminal:
    There should be continuity.    		 An open in the wire
    Check for continuity to ground:
    There should be no continuity.    		 A short to ground in the wire
    B10 PUR Driver's power window switch in DOWN position Check for continuity between the terminals:
    There should be no continuity.
    • Faulty power window master switch
    • A short to ground in the wire
    B12 ORN
    B10 PUR Driver's power window switch released Check for continuity between the terminals:
    There should be continuity.
    • Faulty power window master switch
    • An open in the wire
    B12 ORN
    B10 PUR Driver's power window switch in DOWN position Check for continuity between the terminals:
    There should be continuity.
    • Faulty power window master switch
    • An open in the wire
    B13 PNK
    B10 PUR Driver's power window switch released Check for continuity between the terminals:
    There should be no continuity.
    • Faulty power window master switch
    • A short to ground in the wire
    B13 PNK
    B9 LTGRN Driver's power window switch in UP position Check for continuity between the terminals:
    There should be continuity.
    • Faulty power window master switch
    • An open in the wire
    B2 LTBLU
    B9 LTGRN Driver's power window switch released Check for continuity between the terminals:
    There should be no continuity.
    • Faulty power window master switch
    • A short to ground in the wire
    B2 LTBLU
    B1 LTGRN Connect the B8 and B1 terminals with a jumper wire, and connect the B7 terminal to body ground. Check the driver's power window motor operation:
    The motor should run (the window should go down).
    • Blown No. 27 (30A) fuse in the driver's under-dash fuse/relay box
    • Faulty driver's power window motor
    • An open in the wire
    B7 BLU Connect the B8 and B7 terminals with a jumper wire, and connect the B1 terminal to body ground. Check the driver's power window motor operation:
    The motor should run (the window should go up).
    • Blown No. 27 (30A) fuse in the driver's under-dash fuse/relay box
    • Faulty driver's power window motor
    • An open in the wire
  6. Reconnect the connectors to the driver's MPCS unit, 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, the control unit must be faulty; replace the driver's MPCS unit and go to step 7.
    TEST CONDITION AND POSSIBLE CAUSE REFERENCE CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    A5 BLK Under all conditions Measure the voltage to ground:
    There should be less than 0.5 V.
    • Poor ground (G601)
    • 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 (G601)
    • An open in the wire
    A7 WHT Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 15 (40A) fuse in the under-hood fuse/relay box
    • Blown No. 7 (10A) fuse in the driver's under-dash fuse/relay box
    • Faulty driver's under-dash fuse/relay box
    • An open in the wire
    B8 WHT Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 23 (P/W) (50A) fuse in the under-hood fuse/relay box
    • Blown No. 27 (30A) fuse in the driver's under-dash fuse/relay box
    • Faulty driver's under-dash fuse/relay box
    • An open in the wire
    A25 YEL Ignition switch ON (II) Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 21 (10A) fuse in the driver's under-dash fuse/relay box
    • Faulty driver's under-dash fuse/relay box
    • An open in the wire
    B9 LT GRN Ignition switch ON (II) Measure the voltage to ground:
    There should be battery voltage.
    • Faulty driver's MPCS unit
    • Faulty power window master switch
    • A short to ground in the wire
    B3 RED Ignition switch ON (II) Measure the voltage to ground:
    There should be battery voltage.
    • Faulty driver's MPCS unit
    • An open in the wire
    B6 GRN Under all conditions Measure the continuity to ground:
    There should be continuity.
    • Poor ground (G601)
    • Faulty driver's MPCS unit
    • An open in the wire
    B5 GRY Ignition switch ON (II) and driver's power window motor runs by connecting the B8 and B1 terminals with a jumper wire, and connect the B7 terminal to body ground. 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 window moves).
    • Blown No. 27 (30A) fuse in the driver's under-dash fuse/relay box
    • Faulty driver's MPCS unit
    • Faulty driver's power window motor
    • An open in the wire
    B4 BRN Ignition switch ON (II) and driver's power window motor runs by connecting the B8 and B1 terminals with a jumper wire, and connect the B7 terminal to body ground. 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 window moves).
    • Blown No. 27 (30A) fuse in the driver's under-dash fuse/relay box
    • Faulty driver's MPCS unit
    • Faulty driver's power window motor
    • An open in the wire
  7. Reset the power window control unit (see RESETTING THE POWER WINDOW CONTROL UNIT  ).
RENDER: 1.0x

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

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