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MICU Input Test

NOTE: Before testing the MICU, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
  1. Turn the ignition switch to LOCK (0).
  2. Disconnect under-dash fuse/relay box connectors E, F, G, M, N, Q, R, and T.
    NOTE: All connector views are wire side of female terminals.
    Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors E, F And G
    G06612172Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 2: Identifying Under-Dash Fuse/Relay Box Connectors M, N, R, Q And T
    G06612173Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. 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 4.
  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.
    MICU INPUT TEST REFERENCE CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    G16 WHT Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 12 (15 A) fuse in the under-hood fuse/relay box
    • An open or high resistance in the wire
    G7
    .
    F23    		 PUR Under all conditions Connect terminals G16 and G7 [F23] with a jumper wire momentarily: The horn should sound.
    • Poor ground(body ground)
    • Blown No. 12 (15 A) fuse in the under-hood fuse/relay box
    • Faulty horn
    • An open or high resistance in the wire
    E20 GRN Under all conditions Connect terminals G21 and E20 with a jumper wire: The tailgate release actuator should work (tailgate should open).
    • Poor ground (G602) or an open in the ground wire
    • Faulty tailgate release actuator
    • An open or high resistance in the wire
    N7 PNK Under all conditions Connect battery power to terminal N13 and ground terminal N7 momentarily: The driver's door lock actuator should unlock.
    • Faulty driver's door lock actuator
    • An open or high resistance in the wire
    N13 GRY
    M8 YEL Under all conditions Connect battery power to terminal M8 and ground terminal M10 momentarily: The front passenger's and the right rear door lock actuators should unlock.
    • Faulty front passenger's door lock actuator
    • Faulty right rear door lock actuator
    • An open or high resistance in the wire
    M10 PNK
    E14 YEL Under all conditions Connect battery power to terminal E14 and ground terminal E21 momentarily: The left rear door lock actuator should unlock.
    • Faulty left rear door lock actuator
    • An open or high resistance in the wire
    E21 PNK
  5. Reconnect the connectors to the 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 (see REMOVAL AND INSTALLATION ).
    MICU INPUT TEST REFERENCE CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    E6 BLK In all ignition switch positions Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G602) or an open in the ground wire
    • An open or high resistance in the wire
    E33 BLK In all ignition switch positions Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G602) or an open in the ground wire
    • An open or high resistance in the wire
    F20 BLK In all ignition switch positions Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G401) or an open in the ground wire
    • An open or high resistance in the wire
    T34 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
    E2 GRY Right rear door open Measure the voltage to ground:
    There should be less than 0.2 V.
    • Faulty right rear door switch
    • An open or high resistance in the wire
    Right rear door closed Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty right rear door switch
    • A short to ground in the wire
    E3 LT GRN Front passenger's door open Measure the voltage to ground:
    There should be less than 0.2 V.
    • Faulty front passenger's door switch
    • An open or high resistance in the wire
    Front passenger's door closed Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty front passenger's door switch
    • A short to ground in the wire
    E17 WHT Left rear door open Measure the voltage to ground:
    There should be less than 0.2 V.
    • Faulty left rear door switch
    • An open or high resistance in the wire
    Left rear door closed Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty left rear door switch
    • A short to ground in the wire
    E36 PNK Tailgate open Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G602) or an open in the ground wire
    • Faulty tailgate latch switch
    • An open or high resistance in the wire
    Tailgate closed Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty tailgate latch switch
    • A short to ground in the wire
    E37 GRN Driver's door open Measure the voltage to ground:
    There should be less than 0.2 V.
    • Faulty driver's door switch
    • An open or high resistance in the wire
    Driver's door closed Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty driver's door switch
    • A short to ground in the wire
    F27 RED Transmission range switch in P Measure the voltage to ground:
    There should be less than 0 2 V.
    • Poor ground (G101) or an open in the ground wire
    • Faulty transmission range switch
    • An open or high resistance in the wire
    Transmission range switch in any other position than P Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty transmission range switch
    • A short to ground in the wire
    G13 LT BLU Hood open Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G301) or an open in the ground wire
    • Faulty hood switch
    • An open or high resistance in the wire
    Hood closed Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty hood switch
    • A short to ground in the wire
    Q4(1) GRN Under all conditions Measure the voltage to ground:
    There should be less than 0.2 V.    		 An open or high resistance in the wire
    R16 GRY Ignition key inserted into the ignition switch Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G501) or an open in the ground wire
    • Faulty ignition key switch
    • An open or high resistance in the wire
    Ignition switch LOCK (0) 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
    T22 LT BLU Front passenger's door lock knob switch in UNLOCK Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G503) or an open in the ground wire
    • Faulty front passenger's door lock knob switch
    • An open or high resistance in the wire
    Front passenger's door lock knob switch in LOCK Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty front passenger's door lock knob switch
    • A short to ground in the wire
    E13 WHT Tailgate outer handle pulled Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G602) or an open in the ground wire
    • Faulty tailgate outer handle switch
    • An open or high resistance in the wire
    Tailgate outer handle released Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty tailgate outer handle switch
    • A short to ground in the wire
    T23 WHT Driver's door lock knob switch in UNLOCK Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G501) or an open in the ground wire
    • Faulty driver's door lock knob switch
    • An open or high resistance in the wire
    Driver's door lock knob switch in LOCK Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty driver's door lock knob switch
    • A short to ground in the wire
    T24 LT GRN Driver's door lock knob switch in UNLOCK Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty driver's door lock knob switch
    • A short to ground in the wire
    Driver's door lock knob switch in LOCK Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G501) or an open in the ground wire
    • Faulty driver's door lock knob switch
    • An open or high resistance in the wire
    T25 LT BLU Right rear door lock knob switch in UNLOCK Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G552) or an open in the ground wire
    • Faulty right rear door lock knob switch
    • An open or high resistance in the wire
    Right rear door lock knob switch in LOCK Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty right rear door lock knob switch
    • A short to ground in the wire
    T26 PUR Left rear door lock knob switch in UNLOCK Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G601)(2) (G602)(3) or an open in the ground wire
    • Faulty left rear door lock knob switch
    • An open or high resistance in the wire
    Left rear door lock knob switch in LOCK Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty left rear door lock knob switch
    • A short to ground in the wire
    T27 GRY Driver's door lock switch in UNLOCK Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G501) or an open in the ground wire
    • Faulty driver's door lock switch
    • An open or high resistance in the wire
    Driver's door lock switch in neutral Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty driver's door lock switch
    • A short to ground in the wire
    T28 BLU Driver's door lock switch in LOCK Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G501) or an open in the ground wire
    • Faulty driver's door lock switch
    • An open or high resistance in the wire
    Driver's door lock switch in neutral Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty driver's door lock switch
    • A short to ground in the wire
    T29 PUR Front passenger's door lock switch in UNLOCK Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G503) or an open in the ground wire
    • Faulty front passenger's door lock switch
    • An open or high resistance in the wire
    Front passenger's door lock switch in neutral Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty front passenger's door lock switch
    • A short to ground in the wire
    T30 YEL Front passenger's door lock switch in LOCK Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G503) or an open in the ground wire
    • Faulty front passenger's door lock switch
    • An open or high resistance in the wire
    Front passenger's door lock switch in neutral Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty front passenger's door lock switch
    • A short to ground in the wire
    T31 BRN Driver's door key cylinder switch in UNLOCK Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G501) or an open in the ground wire
    • Faulty driver's door key cylinder switch
    • An open or high resistance in the wire
    Driver's door key cylinder switch in neutral Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty driver's door key cylinder switch
    • A short to ground in the wire
    T32 PNK Driver's door key cylinder switch in LOCK Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G501) or an open in the ground wire
    • Faulty driver's door key cylinder switch
    • An open or high resistance in the wire
    Driver's door key cylinder switch in neutral Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty driver's door key cylinder switch
    • A short to ground in the wire
    (1) If the factory-installed audio unit or audio-navigation unit is removed from the vehicle, this voltage will be between 10-12 V.
    (2) '07-09 models
    (3) '10-11 models
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