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Home >> Acura >> 2009 >> CSX Base, Automatic >> Repair and Diagnosis >> Electrical >> Gauges >> Reminder Systems >> MICU Input Test

MICU Input Test

  1. Before troubleshooting the multiplex 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 the fuse is blown, replace it and go to step 3.
  3. Disconnect the driver's under-dash fuse/relay box connectors E, F, R, and S.
    NOTE: All connector views are wire side of female terminals.
    Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors
    G06268861Courtesy 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 the input test at the connector.
    • If a test indicates a problem, find and correct the cause, then recheck the system.
    • If the input test proves OK, go to step 6.
      TEST CONDITION CHART

      Cavity Wire Test condition Test: Desired result Possible cause If result is not obtained
      E15 (A/T) BRN Under all conditions Connect battery power to the E15 terminal:
      The back-up lights should come on.
      • Poor ground (G701)
      • Blown bulb
      • An open in the wire
  6. Reconnect the connector to the under-dash fuse/relay box, and make these input tests at the connector.
    • 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
      E37 GRN Driver's door open Check for voltage to ground:
      There should be less than 0.5 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 around in the wire
      F9 (ATT) PUR Transmission range switch in R Check for voltage to ground:
      There should be less than 0.5 V.
      • Poor ground (G101)
      • Faulty transmission range switch
      • An open in the wire
      Transmission range switch in any other position than R Check for voltage to ground:
      There should be 5 V or more.
      • Faulty transmission range switch
      • A short to ground in the wire
      R6 PNK Ignition key inserted into the ignition switch Check for voltage to ground:
      There should be less than 0.5 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
      S1
      .
      S5      		 ORN
      .
      BLK      		 Combination light switch OFF Check for voltage between S1 and S5 terminals:
      There should be less than 0.5 V.
      • Faulty combination light switch
      • An open in the wire
      Combination light switch in any other position than OFF Check for voltage between S1 and S5 terminals:
      There should be 5 V or more.
      • Faulty combination light switch
      • A short to ground in the wire
      S11
      .
      S5      		 PNK
      .
      BLK      		 Combination light switch (Headlight position) ON Check for voltage between S11 and S5 terminals:
      There should be less than 0.5 V.
      • Faulty combination light switch
      • An open in the wire
      Combination light switch OFF Check for voltage between S11 and S5 terminals:
      There should be 5 V or more.
      • Faulty combination light switch
      • A short to ground in the wire
      S13
      .
      S5      		 GRY
      .
      BLK      		 Combination light switch (SMALL position) ON Check for voltage between S13 and S5 terminals:
      There should be less than 0.5 V.
      • Faulty combination light switch
      • An open in the wire
      Combination light switch OFF Check for voltage between S13 and S5 terminals:
      There should be 5 V or more.
      • Faulty combination light switch
      • A short to ground in the wire
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