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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 B, D, F, G, Q, and R.
    NOTE: All connector views are wire side of female terminals.
    Fig 1: Identifying Driver's Under-Dash Fuse/Relay Box Connectors B, D, F, G, Q, And R
    G07770489Courtesy 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.
    MICU INPUT TEST REFERENCE CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    D11 RED Under all conditions Connect terminal F19 and terminal D11 with a jumper wire:
    The taillights, license plate lights and the rear side marker lights should come on.
    • Blown bulb
    • Poor ground (G901) or an open in the ground wire
    • An open or high resistance in the wire
    F10 RED Under all conditions Connect terminal F19 and terminal F10 with a jumper wire:
    The left front parking light and the left front side marker light should come on.
    • Blown bulb
    • Poor ground (G302) or an open in the ground wire
    • An open or high resistance in the wire
    F13 WHT/RED Under all conditions Connect terminal F19 and terminal F13 with a jumper wire:
    The left headlight (high beam) should come on.
    • Blown left high beam bulb
    • Poor ground (G302) or an open in the ground wire
    • An open or high resistance in the wire
    F21 RED/YEL Under all conditions Connect terminal F19 and terminal F21 with a jumper wire:
    The left headlight (low beam) should come on.
    • Blown left low beam bulb
    • Faulty HID unit
    • Poor ground (G302) or an open in the ground wire
    • An open or high resistance in the wire
    G12 BLU/YEL Under all conditions Connect terminal F19 and terminal G12 with a jumper wire:
    The left fog light should come on.
    • Blown bulb
    • Poor ground (G302) or an open in the ground wire
    • An open or high resistance in the wire
  6. 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, go to step 7.
    MICU INPUT TEST REFERENCE CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    B1 WHT Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 3-3 (AS LT MAIN) (30 A) fuse in the under-hood fuse/relay box
    • Faulty driver's under-dash fuse/relay box
    • An open or high resistance in the wire
    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
    D12 BRN Driver's door open Measure the voltage to ground:
    There should be less than 0.2 V.
    • Faulty driver's door switch
    • Faulty driver's door switch ground
    • An open or high resistance in the wire
    Driver's door closed Measure the voltage to ground:
    There should be about 5 V.
    • Faulty driver's door switch
    • A short to ground in the wire
    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
    F17 GRN Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 3-3 (AS LT MAIN) (30 A) fuse in the under-hood fuse/relay box
    • An open or high resistance in the wire
    F19 BLK/RED Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 3-5 (DR LT MAIN) (30 A) fuse in the under-hood fuse/relay box
    • An open or high resistance in the wire
    Q18 WHT Ignition key inserted into the ignition switch Measure the voltage to ground:
    There should be less than 0.2 V.
    • Faulty ignition key switch
    • Poor ground (G503)
    • An open or high resistance in the wire
    Ignition switch LOCK (0), and the ignition key removed from the ignition switch Measure the voltage to ground:
    There should be about 5 V.
    • Faulty ignition key switch
    • A short to ground in the wire
    R6 R3 RED BLK Combination light switch OFF Measure the voltage between terminals R6 and R3:
    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 R6 and R3:
    There should be about 5 V.
    • Faulty combination light switch
    • A short to ground in the wire
    R7 R3 GRY BLK Combination light switch (PARKING position) ON Measure the voltage between terminals R7 and R3:
    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 R7 and R3:
    There should be about 5 V.
    • Faulty combination light switch
    • A short to ground in the wire
    R8 R3 BRN BLK Combination light switch (headlight) ON Measure the voltage between terminals R8 and R3:
    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 R8 and R3:
    There should be about 5 V.
    • Faulty combination light switch
    • A short to ground in the wire
    R21 R3 RED BLK Combination light switch lever pulled (Passing) Measure the voltage between terminals R21 and R3:
    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 R21 and R3:
    There should be about 5 V.
    • Faulty combination light switch
    • A short to ground in the wire
    R22 R3 LT BLU BLK Combination light switch (Dimmer) in high beam position Measure the voltage between terminals R22 and R3:
    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 R22 and R3:
    There should be about 5 V.
    • Faulty combination light switch
    • A short to ground in the wire
    R10 R3 PUR BLK Fog light switch ON Measure the voltage between terminals R10 and R3:
    There should be less than 0.2 V.
    • Faulty fog light switch
    • An open or high resistance in the wire
    Fog light switch OFF Measure the voltage between terminals R10 and R3:
    There should be about 5 V.
    • Faulty fog light switch
    • A short to ground in the wire

    Passenger's MICU 

  7. Turn the ignition switch to LOCK (0), and remove the passenger's kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREAS ).
  8. Disconnect passenger's under-dash fuse/relay box connectors A and E.
    NOTE: All connector views are wire side of female terminals.
    Fig 2: Identifying Passenger's Under-Dash Fuse/Relay Box Connectors A And E
    G07770490Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. 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 10.
  10. 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 11.
    MICU INPUT TEST REFERENCE CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    A8 WHT Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 3-3 (AS LT MAIN) (30 A) fuse in the under-hood fuse/relay box
    • Faulty driver's under-dash fuse/relay box
    • An open or high resistance in the wire
    E2 ORN Under all conditions Connect terminals A8 and E2 with a jumper wire:
    The right headlight (high beam) should come on.
    • Blown right high beam bulb
    • Poor ground (G201)
    • An open or high resistance in the wire
    E10 BRN Under all conditions Connect terminals A8 and E10 with a jumper wire:
    The right headlight (low beam) should come on.
    • Blown right low beam bulb
    • Faulty HID unit
    • Poor ground (G201)
    • An open or high resistance in the wire
    E12 GRY Under all conditions Connect terminals A8 and E12 with a jumper wire:
    The right front parking light and the right front side marker light should come on.
    • Blown bulb
    • Poor ground (G201)
    • An open or high resistance in the wire
    E13 LT BLU Under all conditions Connect terminals A8 and E13 with a jumper wire:
    The right fog light should come on.
    • Blown bulb
    • Poor ground (G201)
    • An open or high resistance in the wire
    A17 GRN Passenger's under-dash fuse/relay box connector A (38P) disconnected Check for continuity between passenger's under-dash fuse/relay box connector A (38P) terminal No. 17 and driver's under-dash fuse/relay box connector Q (20P) terminal No. 8:
    There should be continuity.    		 An open or high resistance in the wire
  11. Reconnect the connectors to the passenger's under-dash fuse/relay box, turn the ignition switch to ON (II), 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, go to step 12.
    MICU INPUT TEST REFERENCE CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    A14 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
    • Faulty driver's under-dash fuse/relay box
    • An open or high resistance in the wire
    A35 BRN Ignition switch ON (II) Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 5 (7.5 A) fuse in the driver's under-dash fuse/relay box
    • Faulty driver's under-dash fuse/relay box
    • An open or high resistance in the wire
    A36 BLK Under all conditions Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G505)
    • An open or high resistance in the ground wire
    A37 BLK Under all conditions Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G505)
    • An open or high resistance in the ground wire
    E15 BLK Under all conditions Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G201)
    • An open or high resistance in the ground wire
    E16 BLK Under all conditions Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G201)
    • An open or high resistance in the ground wire
  12. If multiple failures are found on more than one control unit, replace the driver's under-dash fuse/relay box (includes the driver's MICU), USA models (see DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU)REMOVAL AND INSTALLATION ), Canada models (see SPECIAL TOOLS REQUIRED ). If input failures are related to a particular control unit, replace the control unit.
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