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MICU Input Test

  1. Before troubleshooting the entry lights control system, troubleshoot the B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
  2. Check the No. 10 (7.5 A) fuse in the under-dash fuse/relay box. If any fuse is blown, replace it and go to step 3.
  3. Disconnect the under-dash fuse/relay box connectors E, F, K, R, and T.
    NOTE: All connector views are shown from wire side of female terminals.
    Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors (1 Of 2)
    G06268786Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 2: Identifying Under-Dash Fuse/Relay Box Connectors (2 Of 2)
    G06268787Courtesy 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, make these input tests at the appropriate connector.
    • 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.
      TEST CONDITION CHART

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      K4 PNK Under all conditions With moonroof: select the interior light switch in DOOR position Attach to ground:
      The ceiling light and map lights should come on.
      • Blown No. 22 (7.5 A) fuse in the under-hood fuse/relay box
      • Blown bulb(s)
      • Faulty ceiling light
      • Faulty map light
      • Faulty interior light switch (with moonroof)
      • An open in the wire
  6. Reconnect the connectors to the under-dash fuse/relay box, and make these input tests at the 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.
      TEST CONDITION CHART

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      E6 BLK Under all conditions Check for voltage to ground:
      There should be less than 0.5 V.
      • Poor ground (G602)
      • An open in the wire
      E33 BLK Under all conditions Check for voltage to ground:
      There should be less than 0.5 V.
      • Poor ground (G601)
      • An open in the wire
      F20 BLK Under all conditions Check for voltage to ground:
      There should be less than 0.5 V.
      • Poor ground (G401)
      • An open in the wire
      T34 BLK Under all conditions Check for voltage to ground:
      There should be less than 0.5 V.
      • Poor ground (G501)
      • An open in the wire
      E37 GRN Driver's door open Check for voltage to ground:
      There should be less than 1 V.
      • Faulty driver's door switch
      • An open in the wire
      Driver's door closed Check for voltage to ground:
      There should be 5 V or more.
      • Faulty driver's door switch
      • A short to ground in the wire
      E3 LT GRN Front passenger's door open Check for voltage to ground:
      There should be less than 1 V.
      • Faulty front passenger's door switch
      • An open in the wire
      Front passenger's door closed Check for voltage to ground:
      There should be 5 V or more.
      • Faulty front passenger's door switch
      • A short to ground in the wire
      E2 GRY Right rear door open Check for voltage to ground:
      There should be less than 1 V.
      • Faulty right rear door switch
      • An open in the wire
      Right rear door closed Check for voltage to ground:
      There should be 5 V or more.
      • Faulty right rear door switch
      • A short to ground in the wire
      E17 BRN Left rear door open Check for voltage to ground:
      There should be less than 1 V.
      • Faulty left rear door switch
      • An open in the wire
      Left rear door closed Check for voltage to ground:
      There should be 5 V or more.
      • Faulty left rear door switch
      • A short to around in the wire
      R6 PNK Ignition key inserted into the ignition switch Check for voltage to ground:
      There should be less than 1 V.
      • Poor ground (G504)
      • Faulty ignition key switch
      • An open in the wire
      Ignition switch OFF and ignition key removed from the ignition switch Check for voltage to ground:
      There should be 5 V or more.
      • Faulty ignition key switch
      • A short to ground in the wire
      T23 WHT Driver door lock knob switch unlocked Check for voltage to ground:
      There should be less than 1 V.
      • Poor ground (G501)
      • Faulty driver door lock knob switch
      • An open in the wire
      Driver door lock knob switch locked Check for voltage to ground:
      There should be 5 V or more.
      • Faulty driver door lock knob switch
      • A short to around in the wire
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