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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 the No. 1 (7.5 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 ).
  3. Disconnect the under-dash fuse/relay box connectors A, B, C, 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
    G05960036Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. 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  5.
    TEST CONDITION REFERENCE TABLE

    Cavity Wire Test condition Test: Desired result Possible cause if desired 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 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
    • An open or high resistance in the wire
    • Faulty ignition switch
    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 (G301) or an open in the ground wire
    • Blown bulb
    • An open or high resistance 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 (G602) or an open in the ground wire
    • Blown bulb
    • An open or high resistance in the wire
    A28 WHT Under all conditions Connect terminals B23 and A28 with a jumper wire:
    The right front turn signal light should come on.
    • Poor ground (G201) or an open in the ground wire
    • Blown bulb
    • An open or high resistance 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 (G604) or an open in the ground wire
    • Blown bulb
    • An open or high resistance 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 or high resistance in the wire
    • Poor ground (G501) or an open in the ground wire
    Q6 WHT Under all conditions Connect terminals B23 and Q6 with a jumper wire:
    The right turn signal indicator should come on.
    • Faulty gauge control module
    • An open or high resistance in the wire
    • Poor ground (G501) or an open in the ground wire
  5. Reconnect the connectors to the driver's 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:
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 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
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
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
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 M2 and M33:
There should be about 5 V or more.
  • 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 about 5 V or more.
  • Faulty combination light switch
  • A short to ground in the wire
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