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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 testing, check the No. 1 (15 A), No. 22 (7.5 A), and No. 23 (10 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 ), and remove the driver's dashboard lower cover (see FUSE ACCESS PANEL REMOVAL/INSTALLATION ).
  3. Disconnect the under-dash fuse/relay box connectors A, B, C, E, 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 A, B, C, E, K, M, N, Q, And W
    G06431601Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. 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 5.
    WIRE SPECIFICATIONS

    Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
    B23 WHT Under all conditions Measure the voltage to ground: There should be battery voltage.
    • Blown No. 3 (20 A) fuse in the battery terminal box
    • An open 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 in the wire
    B34 BLU Under all conditions Connect terminals B23 and B34 with a jumper wire: The left front turn signal light should come on.
    • Poor ground (G401)
    • Blown bulb
    • An open in the wire
    C13 BLU Under all conditions Connect terminals B23 and C13 with a jumper wire: The left rear turn signal light should come on.
    • Poor ground (G702)
    • Blown bulb
    • An open in the wire
    A28 BRN Under all conditions Connect terminals B23 and A28 with a jumper wire: The right front turn signal light should come on.
    • Poor ground (G202)
    • Blown bulb
    • An open in the wire
    C41 WHT Under all conditions Connect terminals B23 and C41 with a jumper wire: The right rear turn signal light should come on.
    • Poor ground (G701)
    • Blown bulb
    • An open in the wire
    M20 BLU Under all conditions Connect terminals B23 and M20 with a jumper wire: The left turn signal indicator should come on.
    • Faulty gauge control module
    • An open in the wire
    • Poor ground (G501)
    Q6 WHT Under all conditions Connect terminals B23 and Q6 with a jumper wire: The right turn signal indicator and right side turn signal light(1) should come on.
    • Faulty gauge control module
    • Faulty LED(1)
    • An open in the wire
    • Poor ground (G501, G502(1))
    E7(1) BLU Under all conditions Connect terminals B23 and E7 with a jumper wire: The left side turn signal light should come on.
    • Poor ground (G501)
    • Faulty LED
    • An open in the wire
    (1) With side turn signal light
  5. Reconnect the connectors to the driver's 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
    N5 YEL Under all conditions Measure the voltage to ground: There should be battery voltage.
    • Faulty under-dash fuse/relay box
    • A short to ground in the wire
    Q13 PNK Hazard warning switch pressed Measure the voltage to ground: There should be battery voltage.
    • Faulty hazard warning switch
    • An open or high resistance in the wire
    M2
    .
    M33    		 LT GRN
    .
    BLK    		 Ignition switch ON (II), turn signal switch in left position Measure the voltage between terminals M2 and M33: There should be less than 0.2 V.
    • Faulty combination light switch
    • An open or high resistance in the wire
    Ignition switch ON (II), turn signal switch in right or neutral position Measure the voltage between terminals M6 and M33: There should be at least 5 V.
    • Faulty combination light switch
    • A short to ground in the wire
    M6
    .
    M33    		 BRN
    .
    BLK    		 Ignition switch ON (II), turn signal switch in right position Measure the voltage between terminals M6 and M33: There should be less than 0.2 V.
    • Faulty combination light switch
    • An open or high resistance in the wire
    Ignition switch ON (II), turn signal switch in left or neutral position Measure the voltage between terminals M6 and M33: There should be at least 5 V.
    • Faulty combination light switch
    • A short to ground in the wire
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