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MICU Input Test

WARNING: This page is about a different car, the 2008 Acura TSX, 2007 Acura TSX, 2006 Acura TSX, 2005 Acura TSX, and 2004 Acura TSX. However, it is still accessible from the selected car via links, so may be relevant.
  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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