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MICU Input Test

WARNING: This page is about a different car, the 2011 Honda Pilot, 2010 Honda Pilot, and 2009 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ), and check the No. 38 (30 A) fuse in the under-dash fuse/relay box.
  1. Turn the ignition switch to LOCK (0), and remove the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
  2. Disconnect the under-dash fuse/relay box connectors E, F, R, S and T.
    NOTE: All connector views are shown from the wire side of female terminals.
    Fig 1: Identifying Connector View Of E (42P), F (34P), R (20P) & T (34P)
    G05966422Courtesy 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, do these input tests at the following 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  5.
    TEST CONDITION TABLE

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    F18 BLU Under all conditions Connect battery power to terminal F18:
    The windshield wiper motor should run at low speed.
    • Poor ground (G303)
    • Faulty windshield wiper motor
    • An open in the wire
    F19 GRN Under all conditions Connect battery power to terminal F19:
    The windshield wiper motor should run at high speed.
    • Poor ground (G303)
    • Faulty windshield wiper motor
    • An open in the wire
    F32 RED Run the windshield wiper motor by connecting battery power to the F18 terminal. Check for continuity to ground:
    The needle of the ohmmeter should pulse.
    NOTE: Use an ohmmeter.
    • Faulty windshield wiper motor
    • An open in the wire
    F33 ORN Under all conditions Connect battery power to terminal F33:
    The windshield washer motor should work.
    • Poor ground (G201*1, G202*2)
    • Faulty windshield washer motor
    • An open in the wire
    F34 RED Under all conditions Connect battery power to terminal F34:
    The rear window washer motor should work.
    • Poor ground (G201)
    • Faulty rear window washer motor
    • An open in the wire
    S6
    .
    S4    		 BLU
    .
    BLK/WHT    		 Intermittent dwell timer turned Check resistance between the terminals: There resistance should vary between 0 to 1 kΩ.
    • Faulty wiper/washer switch
    • An open in the wire
    *1: '09-10 MODELS
    *2 '11 MODEL
  5. Reconnect the connectors to the under-dash fuse/relay box, turn the ignition switch to ON (II), and do these input tests at the following connectors.
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, the MICU must be faulty; replace the under-dash fuse/relay box (see REMOVAL AND INSTALLATION ).
    TEST CONDITION TABLE

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    E6 BLK Under all conditions Measure the voltage to ground:
    There should be less than 0.5 V.
    • Poor ground (G401)
    • An open in the wire
    T34
    F20 BLK Under all conditions Measure the voltage to ground:
    There should be less than 0.5 V.
    • Poor ground (G501)
    • An open in the wire
    S10
    .
    S4    		 ORN
    .
    BLK/WHT    		 Wiper switch ON at INT or LO position Measure the voltage between terminals S10 and S4:
    There should be less than 1 V.
    • Faulty wiper/washer switch
    • An open in the wire
    Wiper switch OFF Measure the voltage between terminals S10 and S4:
    There should be more than 5V.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    S20
    .
    S4    		 RED/BLK
    .
    BLK/WHT    		 Wiper switch ON at LO or HI position Measure the voltage between terminals S20 and S4:
    There should be less than 1 V.
    • Faulty wiper/washer switch
    • An open in the wire
    Wiper switch OFF Measure the voltage between terminals S20 and S4:
    There should be more than 5 V.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    S16
    .
    S4    		 GRN
    .
    BLK/WHT    		 Wiper switch ON at MIST position Measure the voltage between terminals S16 and S4:
    There should be less than 1 V.
    • Faulty wiper/washer switch
    • An open in the wire
    Wiper switch OFF Measure the voltage between terminals S16 and S4:
    There should be more than 5 V.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    S17
    .
    S4    		 YEL
    .
    BLK/WHT    		 Washer switch ON Measure the voltage between terminals S17 and S4:
    There should be less than 1 V.
    • Faulty wiper/washer switch
    • An open in the wire
    Wiper switch OFF Measure the voltage between terminals S17 and S4:
    There should be more than 5 V.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    S3 YEL/BLK Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 13 (10 A) fuse in the auxiliary under-hood fuse/relay box
    • Faulty rear window wiper motor relay 1 (forward)
    • An open in the wire
    Attach to ground:
    The rear window wiper motor should work (forward).
    • Poor ground (G303)
    • Faulty rear window wiper motor
    • Faulty rear window wiper motor relay 2 (backward)
    • An open in the wire
    R12 YEL/GRN Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 13 (10 A) fuse in the auxiliary under-hood fuse/relay box
    • Faulty rear window wiper motor relay 2 (backward)
    • An open in the wire
    Attach to ground:
    The rear window wiper motor should work (backward).
    • Poor ground (G303)
    • Faulty rear window wiper motor
    • Faulty rear window wiper motor relay 1 (forward)
    • An open in the wire
    S2 YEL Rear wiper in park position Measure the voltage to ground:
    There should be less than 1 V.
    • Poor ground (G601)
    • Faulty rear window wiper motor
    • An open in the wire
    Rear wiper in any other position than park position Measure the voltage to ground:
    There should be more than 5 V.
    • Faulty rear window wiper motor
    • A short to ground in the wire
    T27 GRY Rear wiper in rise/return position or park position Measure the voltage to ground:
    There should be less than 1 V.
    • Poor ground (G601)
    • Faulty rear window wiper motor
    • An open in the wire
    Rear wiper in any other position than rise/return position or park position Measure the voltage to ground:
    There should be more than 5 V.
    • Faulty rear window wiper motor
    • A short to ground in the wire
    S8
    .
    S4    		 GRN/RED
    .
    BLK/WHT    		 Rear window washer switch ON Measure the voltage between terminals S8 and S4:
    There should be less than 1 V.
    • Faulty wiper/washer switch
    • An open in the wire
    Rear window washer switch OFF Measure the voltage between terminals S8 and S4:
    There should be more than 5 V.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    S9
    .
    S4    		 WHT
    .
    BLK/WHT    		 Rear window wiper switch ON Measure the voltage between terminals S9 and S4:
    There should be less than 1 V.
    • Faulty wiper/washer switch
    • An open in the wire
    Rear window wiper switch OFF Measure the voltage between terminals S9 and S4:
    There should be more than 5 V.
    • Faulty wiper/washer switch
    • A short to ground in the wire
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