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Home >> Acura >> 2009 >> CSX Base, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Multiplex Integrated Control System >> MICU Input Test

MICU Input Test

  1. Before troubleshooting the multiplex integrated control system, troubleshoot the B-CAN SYSTEM DIAGNOSIS TEST MODE A  .
  2. Check the No. 10 (7.5 A) fuse in the under-dash fuse/relay box. If the fuse is blown, replace it and go to step 3.
  3. Disconnect the under-dash fuse/relay box connectors E, F, G, K, and T.
    NOTE: All connector views are wire side of female terminals.
    Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors (42P)
    G06269258Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 2: Identifying Under-Dash Fuse/Relay Box Connectors K(8P)
    G06269259Courtesy 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 connector 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
      G2 ORN Under all conditions Check for voltage to ground:
      There should be battery voltage.
      • Blown No. 23 (10 A) fuse in the under-hood fuse/relay box
      • An open in the wire
      K4 PNK Under all conditions Attach to ground:
      The ceiling light should come on.
      • Blown No. 22 (7.5 A) fuse in the under-hood fuse/relay box
      • Blown bulb(s)
      • Faulty ceiling light
      • 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
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