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MICU Input Test

WARNING: This page is about a different car, the 2013 Honda Fit, 2012 Honda Fit, 2011 Honda Fit, 2010 Honda Fit, and 2009 Honda Fit. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before testing, check for No. 22 (7.5 A) fuse in the under-dash fuse/relay box.
  1. Turn the ignition switch to LOCK (0).
  2. Remove the fuse access panel (see FUSE ACCESS PANEL REMOVAL/INSTALLATION ).
  3. Disconnect the under-dash fuse/relay box connectors C, E, G, K, M, N, Q, and W.
    NOTE: All connector views are shown from wire side of female terminals.
    Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors
    G05960049Courtesy 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. Reconnect the connectors to the under-dash fuse/relay box, 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 REFERENCE TABLE

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    K10 BLK In all ignition switch positions Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G502) or an open in the ground wire
    • An open in the wire
    M16 BLK In all ignition switch positions Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G501) or an open in the ground wire
    • An open or high resistance in the wire
    N2 BLK In all ignition switch positions Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G501) or an open in the ground wire
    • An open or high resistance in the wire
    Q9 BLK In all ignition switch positions Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G502) or an open in the ground wire
    • An open or high resistance in the wire
    W1 YEL Ignition switch ON (II) Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 60 (50 A) fuse in the under-dash fuse/relay box
    • Faulty ignition switch
    • An open or high resistance in the wire
    C33 BLU Driver's door open Measure the voltage to ground:
    There should be less than 0.2 V.
    • Faulty driver's door switch
    • Faulty driver's door switch ground
    • An open or high resistance in the wire
    Driver's door closed Measure the voltage to ground:
    There should be about 5 V or more.
    • Faulty driver's door switch
    • A short to ground in the wire
    C32 LT GRN Front passenger's door open Measure the voltage to ground:
    There should be less than 0.2 V.
    • Faulty front passenger's door switch
    • Faulty front passenger's door switch ground
    • An open in the wire
    Front passenger's door closed Measure the voltage to ground:
    There should be about 5 V or more.
    • Faulty front passenger's door switch
    • A short to ground in the wire
    C40 GRN Right rear door open Measure the voltage to ground:
    There should be less than 0.2 V.
    • Faulty right rear door switch
    • Faulty right rear door switch ground
    • An open or high resistance in the wire
    Right rear door closed Measure the voltage to ground:
    There should be about 5 V or more.
    • Faulty right rear door switch
    • A short to ground in the wire
    C26 PNK Left rear door open Measure the voltage to ground:
    There should be less than 0.2 V.
    • Faulty left rear door switch
    • Faulty left rear door switch ground
    • An open or high resistance in the wire
    Left rear door closed Measure the voltage to ground:
    There should be about 5 V or more.
    • Faulty left rear door switch
    • A short to ground in the wire
    C22 ORN Tailgate open Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G602) or an open in the ground wire
    • Faulty tailgate latch switch
    • An open or high resistance in the wire
    Tailgate closed Measure the voltage to ground:
    There should be about 5 V or more.
    There should be no continuity
    • Faulty tailgate latch switch
    • A short to ground in the wire
    M34 GRY Ignition key inserted into the ignition switch Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G501) or an open in the ground wire
    • Faulty ignition key switch
    • An open or high resistance in the wire
    Ignition switch LOCK (0), and the ignition key removed from the ignition switch Measure the voltage to ground:
    There should be about 5 V or more.
    • Faulty ignition key switch
    • A short to ground in the wire
    E2 BRN Driver's door lock knob switch in UNLOCK Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G501) or an open in the ground wire
    • Faulty driver's door lock knob switch
    • An open or high resistance in the wire
    Driver's door lock knob switch in neutral or LOCK Measure the voltage to ground:
    There should be about 5 V or more.
    • Faulty driver's door lock knob switch
    • A short to ground in the wire
    E9 RED Driver's door lock knob switch in LOCK Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G501) or an open in the ground wire
    • Faulty driver's door lock knob switch
    • An open or high resistance in the wire
    Driver's door lock knob switch in neutral or UNLOCK Measure the voltage to ground:
    There should be about 5 V or more.
    • Faulty driver's door lock knob switch
    • A short to ground in the wire
    G7 BLU Ceiling light switch in middle position Connect terminal G7 and body ground with a jumper wire:
    The ceiling light should come on.
    • Blown No. 1 (7.5 A) fuse in the under-dash fuse/relay box
    • Faulty ceiling light
    • Blown bulb
    • An open or high resistance in the wire
    C18 PUR Under all conditions Connect terminal C18 and body ground with a jumper wire:
    The cargo area light should come on.
    • Blown No. 1 (7.5 A) fuse in the under-dash fuse/relay box
    • Faulty cargo area light
    • Blown bulb
    • An open or high resistance in the wire
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