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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 performing the input tests, check the No. 1, No. 5, No. 15, No. 22, No. 24, No. 32, No. 34, No. 48, and No. 51 fuses 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 under-dash fuse/relay box connectors A, B, C, K, M, N, Q, R, S, and W.
    NOTE: All connector views are wire side of female terminals.
    Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors
    G05960007Courtesy 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, 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  6.
    TEST CONDITION REFERENCE TABLE

    Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
    A24 PNK Ignition switch ON (II) Connect terminals W1 and A24 with a jumper wire: The right headlight (low beam) should come on.
    • Blown bulb
    • Poor ground (G201) or an open in the ground wire
    • An open or high resistance in the wire
    A30 GRN Ignition switch ON (II) Connect terminals W1 and A30 with a jumper wire: The right headlight (high beam) should come on.
    • Blown bulb
    • Poor ground (G201) or an open in the ground wire
    • An open or high resistance in the wire
    B29 BRN Ignition switch ON (II) Connect terminals W1 and B29 with a jumper wire: The left headlight (low beam) should come on.
    • Blown bulb
    • Poor ground (G301) or an open in the ground wire
    • An open or high resistance in the wire
    B13 GRY Ignition switch ON (II) Connect terminals W1 and B13 with a jumper wire: The left headlight (high beam) should come on.
    • Blown bulb
    • Poor ground (G301) or an open in the ground wire
    • An open or high resistance in the wire
    A8 GRY Ignition switch ON (II) Connect terminals W1 and A8 with a jumper wire: The right front parking/side marker light should come on.
    • Blown bulb
    • Poor ground (G201) or an open in the ground wire
    • An open or high resistance in the wire
    B30 GRY Ignition switch ON (II) Connect terminals W1 and B30 with a jumper wire: The left front parking/side marker light should come on.
    • Blown bulb
    • Poor ground (G301) or an open in the ground wire
    • An open or high resistance in the wire
    C42 GRY Ignition switch ON (II) Connect terminals W1 and C42 with a jumper wire: The taillights and license plate lights should come on.
    • Blown bulb
    • Poor ground (G602, G604) or an open in the ground wire
    • An open or high resistance in the wire
    C21 GRN Ignition switch ON (II) Connect terminals W1 and C21 with a jumper wire: The back-up lights should come on.
    • Blown bulb
    • Poor ground (G602, G604) or an open in the ground wire
    • An open or high resistance in the wire
  6. 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 result is not obtained
    N2 BLK Under all conditions 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
    K10 BLK Under all conditions 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
    M16 BLK Under all conditions 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 Under all conditions 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
    M8. M33 BLU. BLK Combination light switch OFF Measure the voltage between terminals M8 and M33: There should be less than 0.2 V.
    • Faulty combination light switch
    • An open or high resistance in the wire
    Combination light switch in any other position than OFF Measure the voltage between terminals M8 and M33: There should be about 5 V or more.
    • Faulty combination light switch
    • A short in the wire
    M7. M33 GRY. BLK Combination light switch (Parking position) ON Measure the voltage between terminals M7 and M33: There should be less than 0.2 V.
    • Faulty combination light switch
    • An open or high resistance in the wire
    Combination light switch OFF Measure the voltage between terminals M7 and M33: There should be about 5 V or more.
    • Faulty combination light switch
    • A short in the wire
    M5. M33 RED. BLK Combination light switch (headlight) ON Measure the voltage between terminals M5 and M33: There should be less than 0.2 V.
    • Faulty combination light switch
    • An open or high resistance in the wire
    Combination light switch OFF Measure the voltage between terminals M5 and M33: There should be about 5 V or more.
    • Faulty combination light switch
    • A short in the wire
    M4. M33 WHT. BLK Combination light switch lever pulled (Passing) Measure the voltage between terminals M4 and M33: There should be less than 0.2 V.
    • Faulty combination light switch
    • An open or high resistance in the wire
    Combination light switch lever released (OFF) Measure the voltage between terminals M4 and M33: There should be about 5 V or more.
    • Faulty combination light switch
    • A short in the wire
    M3. M33 LT BLU. BLK Combination light switch (Dimmer) in high beam position Measure the voltage between terminals M3 and M33: There should be less than 0.2 V.
    • Faulty combination light switch
    • An open or high resistance in the wire
    Combination light switch (Dimmer) in low beam position Measure the voltage between terminals M3 and M33: There should be about 5 V or more.
    • Faulty combination light switch
    • A short in the wire
    C21 GRN Ignition switch ON (II) and shift lever in R position Measure the voltage to ground: There should be battery voltage.
    • Faulty back-up light switch (M/T)
    • Faulty MICU
    • Blown No. 5 (10 A) fuse in the under-dash fuse/relay box
    • An open or high resistance in the wire
    B26 (A/T) GRN Ignition switch ON (ID Measure the voltage to ground: There should be battery voltage.
    • Faulty MICU
    • Blown No. 60 (50 A) fuse in the under-dash fuse/relay box
    • Blown No. 5 (10 A) fuse in the under-dash fuse/relay box
    • An open or high resistance in the wire
    R21. M33 GRN. BLK Fog light switch ON Measure the voltage between terminals R21 and M33: There should be less than 0.2 V.
    • Faulty combination light switch
    • An open or high resistance in the wire
    Fog light switch OFF Measure the voltage between terminals R21 and M33: There should be about 5 V or more.
    • Faulty combination light switch
    • A short in the wire
    R20 LT BLU Under all condition Connect the terminal R20 and body ground: The fog lights should come on.
    • Faulty fog light relay
    • Blown No. 9 (20 A) fuse in the under-dash fuse/relay box
    • Blown bulb
    • An open or high resistance in the wire
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