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Driver's MICU

  1. Turn the ignition switch to LOCK (0).
  2. Remove the driver's dashboard undercover (see DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION ), then remove the dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
  3. Disconnect driver's under-dash fuse/relay box connectors N, P, Q, and R.
    NOTE: All connector views are wire side of female terminals.
    Fig 1: Identifying Driver'S Under-Dash Fuse/Relay Box Connectors Terminals N, P, Q, And R
    G07770361Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Inspect the connector and socket terminals to make 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, do the following input test:
    • 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 desired result is not obtained
      P5 BLU Immobilizer-keyless control unit 7P connector disconnected Check for continuity between terminal P5 and the immobilizer-keyless control unit 7P connector terminal No. 3: There should be continuity. An open in the B-CAN wire
      P6 PNK Check for continuity between terminal P6 and the immobilizer-keyless control unit 7P connector terminal No. 4: There should be continuity. An open in the B-CAN wire
      P5 BLU Gauge control module 32P connector disconnected Check for continuity between terminal P5 and the gauge control module 32P connector terminal No. 23: There should be continuity. An open in the B-CAN wire
      P6 PNK Check for continuity between terminal P6 and the gauge control module 32P connector terminal No. 24: There should be continuity. An open in the B-CAN wire
      P5 BLU Power window master switch 37P connector disconnected Check for continuity between terminal P5 and the power window master switch 37P connector terminal No. 33: There should be continuity. An open in the B-CAN wire
      P6 PNK Check for continuity between terminal P6 and the power window master switch 37P connector terminal No. 35: There should be continuity. An open in the B-CAN wire
      P5 BLU Passenger's under-dash fuse/relay box connector A (38P) disconnected Check for continuity between terminal P5 and the passenger's under-dash fuse/relay box connector A (38P) terminal No. 29: There should be continuity. An open in the B-CAN wire
      P6 PNK Check for continuity between terminal P6 and the passenger's under-dash fuse/relay box connector A (38P) terminal No. 11: There should be continuity. An open in the B-CAN wire
      P5 BLU Climate control unit connector B (12P) disconnected Check for continuity between terminal P5 and the climate control unit connector B (12P) terminal No. 2: There should be continuity. An open in the B-CAN wire
      P6 PNK Check for continuity between terminal P6 and the climate control unit connector B (12P) terminal No. 1: There should be continuity. An open in the B-CAN wire
      P5 BLU Audio unit connector B (20P)(5) disconnected Check for continuity between terminal P5 and the audio unit connector B (20P) terminal No. 8: There should be continuity. An open in the B-CAN wire
      P6 PNK Check for continuity between terminal P6 and the audio unit connector B (20P) terminal No. 18: There should be continuity. An open in the B-CAN wire
      P5 BLU Audio-navigation unit connector D (20P) disconnected(3) Check for continuity between terminal P5 and the audio-navigation unit connector D (20P) terminal No. 15: There should be continuity. An open in the B-CAN wire
      P6 PNK Check for continuity between terminal P6 and the audio-navigation unit connector D (20P) terminal No. 6: There should be continuity. An open in the B-CAN wire
      P5 BLU Power tailgate control unit connector C (14P) disconnected(4) Check for continuity between terminal P5 and the power tailgate control unit connector C (14P) terminal No. 6: There should be continuity. An open in the B-CAN wire
      P6 PNK Check for continuity between terminal P6 and the power tailgate control unit connector C (14P) terminal No. 7: There should be continuity. An open in the B-CAN wire
      P5 BLU Power seat control unit connector A (40P)(1) disconnected Check for continuity between terminal P5 and the power seat control unit connector A (40P) terminal No. 39: There should be continuity. An open in the B-CAN wire
      P6 PNK Check for continuity between terminal P6 and the power seat control unit connect A (40P) terminal No. 40: There should be continuity. An open in the B-CAN wire
      P5 BLU HandsFreeLink control unit 28P connector disconnected Check for continuity between terminal P5 and the HandsFreeLink control unit 28P connector terminal No. 17: There should be continuity. An open in the B-CAN wire
      P6 PNK Check for continuity between terminal P6 and the HandsFreeLink control unit 28P connector terminal No. 18: There should be continuity. An open in the B-CAN wire
      P5 BLU AcuraLink control unit 32P connector(2) disconnected Check for continuity between terminal P5 and the AcuraLink control unit 32P connector terminal No. 8: There should be continuity. An open in the B-CAN wire
      P6 PNK Check for continuity between terminal P6 and the AcuraLink control unit 32P connector terminal No. 9: There should be continuity. An open in the B-CAN wire
      P5 BLU Navigation display unit 28P connector disconnected(3) Check for continuity between terminal P5 and the navigation display unit 28P connector terminal No. 8: There should be continuity. An open in the B-CAN wire
      P6 PNK Check for continuity between terminal P6 and the navigation display unit 28P connector terminal No. 9: There should be continuity. An open in the B-CAN wire
      Q16 LT BLU Under all conditions Check for continuity between terminal Q16 and the data link connector (DLC) 16P terminal No. 7: There should be continuity. An open in the B-CAN wire
      (1) With DPMS
      (2) With AcuraLink
      (3) With navigation
      (4) With power tailgate
      (5) Without navigation
  6. Reconnect the connectors to the driver's under-dash fuse/relay box, turn the ignition switch to ON (II), and do the following input tests:
    • 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 7.
      NOTE: These are power and ground tests for the multiplex integrated control unit.
      TEST CONDITION CHART

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      P9 WHT Under all conditions Measure the voltage to ground: There should be battery voltage.
      • Blown No. 15(10 A) fuse in the under-hood fuse/relay box
      • Faulty driver's under-dash fuse/relay box
      • An open or high resistance in the wire
      P20 BRN Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage.
      • Blown No. 5 (7.5 A) fuse in the driver's under- dash fuse/relay box
      • Faulty driver's under-dash fuse/relay box
      • An open or high resistance in the wire
      N12 BRN Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
      • Poor ground (G501)
      • An open or high resistance in the ground wire
      Q1 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
      • Poor ground (G502)
      • An open or high resistance in the ground wire
      Q2 BRN Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
      • Poor ground (G501)
      • An open or high resistance in the ground wire
      R2 BRN Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
      • Poor ground (G501)
      • An open or high resistance in the ground wire
      R5 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
      • Poor ground (G502)
      • An open or high resistance in the ground wire

      Passenger's MICU 

  7. Turn the ignition switch to LOCK (0), and remove the passenger's kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREAS ).
  8. Disconnect passenger's under-dash fuse/relay box connectors A and E.
    NOTE: All connector views are wire side of female terminals.
    Fig 2: Identifying Passenger'S Under-Dash Fuse/Relay Box Connectors Terminal A And E
    G07770362Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. Inspect the connector and socket terminals to make 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 10.
  10. Reconnect the connectors to the passenger's under-dash fuse/relay box, turn the ignition switch to ON (II), and do the following input tests:
    • 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 11.
      TEST CONDITION CHART

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      A14 WHT Under all conditions Measure the voltage to ground: There should be battery voltage.
      • Blown No. 15 (10 A) fuse in the under-hood fuse/relay box
      • Faulty driver's under-dash fuse/relay box
      • An open or high resistance in the wire
      A35 BRN Ignition switch ON (II) Measure the voltage to ground: There should be battery voltage.
      • Blown No. 5 (7.5 A) fuse in the driver's under-dash fuse/relay box
      • Faulty driver's under-dash fuse/relay box
      • An open or high resistance in the wire
      A36 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
      • Poor ground (G505)
      • An open or high resistance in the ground wire
      A37 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
      • Poor ground (G505)
      • An open or high resistance in the ground wire
      E15 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
      • Poor ground (G201)
      • An open or high resistance in the ground wire
      E16 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
      • Poor ground (G201)
      • An open or high resistance in the ground wire
  11. If multiple failures are found on more than one control unit, replace the driver's under-dash fuse/relay box (includes the driver's MICU), USA models (see DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU)REMOVAL AND INSTALLATION ), Canada models (see SPECIAL TOOLS REQUIRED ). If input failures are related to a particular control unit, replace the control unit.
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