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MICU Input Test

WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before doing the input tests, check the No. 1, No. 5, No. 15, No. 22, No. 24, No. 28, No. 29, No. 32, No. 34, No. 48, No. 51, and No. 60 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 ), and remove the driver's dashboard lower cover (see FUSE ACCESS PANEL REMOVAL/INSTALLATION ).
  3. Disconnect under-dash fuse/relay box connectors A, B, C, K, M, N, Q, R, and W.
    NOTE: All connector views are wire side of female terminals.
    Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors A, B, C, K, M, N, Q, R, And W
    G06431571
  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 the following input tests:
    • 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  7.
    WIRE SPECIFICATIONS

    Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
    W1 YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage.
    • Blown No. 60 (50A) fuse in the under-dash fuse/relay box
    • Faulty ignition switch
    • An open or high resistance in the wire
    A24 GRN 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 (G202) or an open in the ground wire
    • An open or high resistance in the wire
    A30 RED 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 (G202) or an open in the ground wire
    • An open or high resistance in the wire
    B29 LT BLU 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 (G401) or an open in the ground wire
    • An open or high resistance in the wire
    B13 PNK 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 (G401) or an open in the ground wire
    • An open or high resistance in the wire
    A8 RED Ignition switch ON (II) Connect terminals W1 and A8 with a jumper wire: The right front parking light and right front side marker light should come on.
    • Blown bulb
    • Poor ground (G202) or an open in the ground wire
    • An open or high resistance in the wire
    B30 RED Ignition switch ON (II) Connect terminals W1 and B30 with a jumper wire: The left front parking light and right front side marker light should come on.
    • Blown bulb
    • Poor ground (G401) 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, rear side marker lights, and license plate lights should come on.
    • Blown bulb
    • Faulty LED
    • Poor ground (G701, G702, G801) 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 (G701, G702) or an open in the ground wire
    • An open or high resistance in the wire
    C14 LT GRN Ignition switch ON (II) Connect terminals W1 and C 14 with a jumper wire: The brake lights and the high mount brake light should come on.
    • Faulty LED
    • Poor ground (G701, G702, G801) or an open in the ground wire
    • An open or high resistance in the wire
  6. Turn the ignition switch to LOCK (0).
  7. Reconnect the connectors to the under-dash fuse/relay box, and do the following input tests:
    • 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:
    WIRE SPECIFICATIONS

    Cavity Wire Test condition Test: Desired result Possible cause if 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 or high resistance 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 (G502) 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 (G501) or an open in the ground wire
    • An open or high resistance 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 (G502) or an open in the ground wire
    • Faulty ignition key switch
    • An open or high resistance in the wire
    Ignition switch in LOCK (0) position and ignition key removed from the ignition switch Measure the voltage to ground: There should be at least 5 V.
    • Faulty ignition key switch
    • A short to ground in the wire
    W1 YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage.
    • Blown No. 60 (50A) fuse in the under-dash fuse/relay box
    • Faulty ignition switch
    • An open or high resistance in the wire
    S1 ORN Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage.
    • Blown No. 60 (50A) fuse in the under-dash fuse/relay box
    • Faulty ignition switch
    • 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 at least 5 V.
    • Faulty combination light switch
    • A short in the wire
    M7 [• ] M33 GRY [• ] BLK Combination light switch (SMALL 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 at least 5 V.
    • 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 at least 5 V.
    • 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 at least 5 V.
    • 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 at least 5 V.
    • Faulty combination light switch
    • A short in the wire
    B26 PNK Ignition switch ON (II) 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 (10A) fuse in the under-dash fuse/relay box
    • An open or high resistance in the wire
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