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MICU Input Test

  1. Remove the left side kick panel (see FRONT DOOR SILL AREA ).
  2. Disconnect the under-dash fuse/relay box connectors D, E, H, J, K, N, P, X, and W.
    NOTE: All connectors are shown from the wire side of female terminals.
    Fig 1: Identifying MICU Connectors Terminals
    G05492797Courtesy 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 from the under-hood fuse/relay box, make these input tests at the connector(s).
    • 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.
      INPUT TEST CONDITION REFERENCE CHART

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      H9 BLK Under all conditions Check for continuity to ground: There should be continuity.
      • Poor ground (G601)
      • An open in the wire
      P1 BRN Under all conditions Check for continuity to ground: There should be continuity.
      • Poor ground (G502)
      • An open in the wire
      E9 BLK Under all conditions Check for continuity to ground: There should be continuity.
      • Poor ground (G601)
      • An open in the wire
      N22 LT BLU Under-dash fuse/relay box connector N (45P) disconnected Check for continuity between terminal N22 and the climate control unit B (16P) connector terminal No. 14: There should be continuity. An open in the wire
      Climate control unit B (16P) connector disconnected Check for continuity to ground: There should be no continuity. Short to ground
      J4 BRN/RED Under all conditions Check for continuity between terminal J4 and power window master switch 23P connector terminal No. 16: There should be continuity. An open in the wire
      Power window master switch 23P connector disconnected Check for continuity to ground: There should be no continuity. Short to ground
      D11 BLU Under all conditions Check for continuity between terminal D11 and relay control module K (10P) connector terminal No. 7: There should be continuity. An open in the wire
      Relay control module K (10P) connector disconnected Check for continuity to ground: There should be no continuity. Short to ground
      X27 LT GRN Under all conditions Check for continuity between terminal X27 and wiper/washer switch 8P connector terminal No. 4: There should be continuity. An open in the wire
      Wiper/washer switch 8P connector disconnected Check for continuity to ground: There should be no continuity Short to ground
      N28 BRN/YEL(1) BRN(2) Under all conditions Check for continuity between terminal N28 and gauge control module B (18P) connector terminal No. 14: There should be continuity. An open in the wire
      Gauge control module B (18P) connector disconnected Check for continuity to ground: There should be no continuity. Short to ground
      G1 GRN/RED Under all conditions Check for continuity between terminal G1 and power seat control unit connector A (40P) No. 40 terminal: There should be continuity. An open in the wire
      Power seat control unit connector A (40P) disconnected Check for continuity to ground: There should be no continuity. Short to ground
      X18 BLU Under all conditions Check for continuity between terminal X18 and HandsFreeLink control unit connector (22P) No. 14 terminal: There should be continuity. An open in the wire
      HandsFreeLink control unit connector (22P) disconnected Check for continuity to ground: There should be no continuity. Short to ground
      (1) '04-05 models
      (2) '06-08 models
  5. Reconnect the connectors to the under-dash fuse/relay box; and make sure these input tests at the appropriate connectors on the under-dash fuse/relay box.
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, the multiplex integrated control unit must be faulty, replace the under-dash fuse/ relay box assembly.
      INPUT TEST CONDITION REFERENCE CHART

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      P7 WHT/BLK(1) WHT(2) Under all conditions Attach to ground: The ignition key light should come on.
      • Blown No. 13 (20 A) fuse in the under-hood fuse/relay box
      • Blown LED
      • An open in the wire
      W4 GRN/RED Ceiling light switch in the middle position, all doors closed Attach to ground: The ceiling light should come on.
      • Blown No. 6 (7.5 A) fuse in the under-dash fuse/relay box
      • Faulty ceiling light
      • An open in the wire
      D6 <-- [bull] --> J9 <-- [bull] --> X34 YEL Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage.
      • Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box
      • An open in the wire
      K4 GRN/WHT Under all conditions Measure the voltage to ground: There should be battery voltage.
      • Blown No. 27 (20 A) fuse in the under-dash fuse/relay box
      • An open in the wire
      X35 WHT/RED(1) RED(2) Under all conditions Measure the voltage to ground: There should be battery voltage.
      • Blown No. 7 (10 A) fuse in the under-dash fuse/relay box
      • An open in the wire
      (1) '04-05 models
      (2) '06-08 models
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