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MICU Input Test

NOTE: Before testing, check the No. 1 (15 A), No. 22 (7.5 A), and No. 60 (IGN) (50 A) fuses 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 ), and remove the driver's dashboard lower cover (see FUSE ACCESS PANEL REMOVAL/INSTALLATION ).
  3. Disconnect the under-dash fuse/relay box connectors C, E, G, K, M, N, Q, and W.
    NOTE: All connector views are shown from wire side of female terminals.
    Fig 1: Under-Dash Fuse/Relay Box Connectors Terminal Layout
    G08094709Courtesy 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:
      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)
      • 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(G502)
      • 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)
      • 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(G501)
      • An open or high resistance in the wire
      W1 YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage.
      • Faulty ignition switch
      • An open or high resistance in the wire
      C33 GRY 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
      C32 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
      • Faulty front passenger's door switch ground
      • 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
      C40 GRN Right rear door open Measure the voltage to ground: There should be less than 0.2 V.
      • Faulty right rear door switch
      • Faulty right rear door switch ground
      • 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
      C26 PNK Left rear door open Measure the voltage to ground: There should be less than 0.2 V.
      • Faulty left rear door switch
      • Faulty left rear door switch ground
      • 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
      M34 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
      E2 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
      E9 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
      G7 BLU Ceiling light switch in the middle (DOOR) position Connect terminal G7 and body ground with a jumper wire: The ceiling light should come on.
      • Faulty ceiling light
      • Blown bulb
      • An open or high resistance in the wire
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