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Driver's MICU

  1. Turn the ignition switch to LOCK (0).
  2. Remove the driver's dashboard undercover (see DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION ), then remove the dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
  3. Disconnect driver's under-dash fuse/relay box connectors D, F, N, P, Q, and R.
    NOTE: All connector views are wire side of female terminals.
    Fig 1: Identifying Driver's Under-Dash Fuse/Relay Box Connectors D, F, N, P, Q, And R
    G07770529Courtesy 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 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 6.
    INPUT TEST REFERENCE CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    F11 WHT Under all conditions Measure the voltage to ground: There should be battery voltage.
    • Blown No. 15 (10 A) fuse in the under-hood fuse/relay box
    • An open or high resistance in the wire
    F32 WHT Under all conditions Measure the voltage to ground: There should be battery voltage.
    • Blown No. 9 (15 A) fuse in the under-hood fuse/relay box
    • An open or high resistance in the wire
    D7 GRN Under all conditions Connect terminals F32 and D7 with a jumper wire: The right rear turn signal light should come on.
    • Poor ground (G901) or an open in the ground wire
    • Blown bulb
    • An open or high resistance in the wire
    D13 BLU Under all conditions Connect terminals F32 and D13 with a jumper wire: The left rear turn signal light should come on.
    • Poor ground (G901) or an open in the ground wire
    • Blown bulb
    • An open or high resistance in the wire
    F1 BLU Under all conditions Connect terminals F32 and F1 with a jumper wire: The left front turn signal light should come on.
    • Poor ground (G302) or an open in the ground wire
    • Blown bulb
    • An open or high resistance in the wire
    P3 GRN Under all conditions Connect terminals F32 and P3 with a jumper wire: The right front turn signal light and the right turn signal indicator should come on.
    • Poor ground (G201) or an open in the ground wire
    • Blown bulb
    • Faulty gauge control module
    • Faulty indicator
    • An open or high resistance in the wire
    P14 BLU Under all conditions Connect terminals F32 and P14 with a jumper wire: The left turn signal indicator should come on.
    • Faulty gauge control module
    • Faulty indicator
    • An open or high resistance in the wire
    • Poor ground (G302) or an open in the ground wire
  6. Reconnect the connectors to the driver's under-dash fuse/relay box, and do the following input tests:
INPUT TEST REFERENCE CHART

Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
Q1 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
  • Poor ground (G502)
  • An open or high resistance in the ground wire
Q2 BRN Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
  • Poor ground (G501)
  • An open or high resistance in the ground wire
R2 BRN Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
  • Poor ground (G501)
  • An open or high resistance in the ground wire
R5 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
  • Poor ground (G502)
  • An open or high resistance in the ground wire
N7 WHT Under all conditions Measure the voltage to ground: There should be battery voltage.
  • Faulty driver's under-dash fuse/relay box
  • A short to ground in the wire
Q17 GRN 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
R13
.
R3		 LT GRN
.
BLK		 Ignition switch ON (II), turn signal switch in left position Measure the voltage between terminals R13 and R3: 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 R13 and R3: There should be about 5 V.
  • Faulty combination light switch
  • A short to ground in the wire
R14
.
R3		 BRN
.
BLK		 Ignition switch ON (II), turn signal switch in right position Measure the voltage between terminals R14 and R3: 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 R14 and R3: There should be about 5 V.
  • Faulty combination light switch
  • A short to ground in the wire
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