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MICU Input Test

NOTE: Before testing, check the No. B1 (15 A) and No. B22 (7.5 A) fuse in the under-dash fuse/relay box.
  1. Turn the ignition switch to LOCK (0).
  2. Remove the fuse lid panel (see FUSE LID PANEL REMOVAL/INSTALLATION ), and remove the driver's dashboard lower cover (see FUSE LID PANEL REMOVAL/INSTALLATION ).
  3. Disconnect the under-dash fuse/relay box connectors D, F, H, N, Q, R, Y, and AD.
    NOTE: All connector views are wire side of female terminals.
    Fig 1: Identifying MICU Input Test Connectors
    G06954034Courtesy 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. Reconnect the connectors to the 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:
    MICU TEST VOLTAGE REFERENCE CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    R2 BLK In all ignition switch positions Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G501)
    • An open or high resistance in the wire
    N5 BLK In all ignition switch positions Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G502)
    • An open or high resistance in the wire
    Y16 BLK In all ignition switch positions Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground(G501)
    • An open or high resistance in the wire
    Q2 BLK In all ignition switch positions Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G502)
    • An open or high resistance in the wire
    AD1 YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage.
    • Blown No. B60 (IGN) (50 A) fuse in the under-dash fuse/relay box
    • Faulty ignition switch
    • An open or high resistance in the wire
    D26 PNK 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 at least 5 V.
    • Faulty driver's door switch
    • A short to ground in the wire
    D27 BRN Passenger's door open Measure the voltage to ground: There should be less than 0.2 V.
    • Faulty passenger's door switch
    • Faulty passenger's door switch ground
    • An open or high resistance in the wire
    Passenger's door closed Measure the voltage to ground: There should be at least 5 V.
    • Faulty passenger's door switch
    • A short to ground in the wire
    Q18 GRY Ignition key inserted into the ignition switch Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G502) or an open in the ground wire
    • Faulty ignition key switch
    • An open or high resistance in the wire
    Ignition switch in LOCK (0), and the 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
    F5 LT BLU 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
    F10 YEL 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
    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
    H5 PNK Interior light switch in DOOR position Connect terminal H5 and body ground with a jumper wire: The ceiling light should come on.
    • Blown No. B1 (15 A) fuse in the under-dash fuse/relay box
    • Faulty individual map light
    • Faulty interior light switch
    • Blown bulb
    • An open or high resistance in the wire
    H2 BLK Interior light switch in ON position Connect terminal H2 and body ground with a jumper wire: The cargo area light should come on.
    • Blown No. B1 (15 A) fuse in the under-dash fuse/relay box
    • Faulty individual map light
    • Faulty interior light switch
    • Blown bulb
    • An open or high resistance in the wire
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