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MICU Input Test

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2015 Honda Crosstour, 2014 Honda Crosstour, 2013 Honda Crosstour, 2012 Honda Crosstour, and 2011 Honda Accord Crosstour. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Driver's MICU 

  1. Turn the ignition switch to LOCK (0), and remove the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
  2. Disconnect driver's under-dash fuse/relay box connectors F, Q, and R.
    NOTE: All connector views are wire side of female terminals.
    Fig 1: Identifying Driver's Under-Dash Fuse/Relay Box Connectors F, Q, And R
    G06420365Courtesy 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 next step.
  4. With the connectors still disconnected, 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 next step.
  5. With the connectors still disconnected, 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 next step.
    CONNECTOR INPUT TESTS REFERENCE

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    F20
    .
    F25    		 ORN
    .
    PUR    		 Under all conditions Connect terminal F16 to terminal F25, and terminal F20 to body ground:
    The windshield wiper motor should run at high speed.
    • Blown No. A3-7 (WIP MTR) (30 A) fuse in the under-hood fuse/relay box
    • Faulty under-hood fuse/relay box
    • Faulty relay circuit board
    • Faulty windshield wiper motor
    • Poor ground (G302) or an open in the ground wire
    • An open or high resistance in the wire
    F19 YEL Run the windshield wiper motor by connecting terminal F16 to terminal F25, and terminal F20 to body ground. Connect terminal F19 to body ground:
    The windshield wiper motor speed should change from high speed to low speed.
    • Faulty under-hood fuse/relay box
    • Faulty relay circuit board
    • Faulty windshield wiper motor
    • An open or high resistance in the wire
    F18 WHT Run the windshield wiper motor by connecting terminal F16 to terminal F25, and terminal F20 to body ground. Check for continuity to ground:
    The needle of the ohmmeter should pulse.
    NOTE: Use an ohmmeter.
    • Faulty windshield wiper motor
    • An open or high resistance in the wire
  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 next step.
      CONNECTOR INPUT TESTS REFERENCE

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      Q10 BLK In all ignition switch positions Measure the voltage to ground:
      There should be less than 0.2 V
      • Poor ground (G402)
      • An open or high resistance in the ground wire
      Q9 BRN In all ignition switch positions Measure the voltage to ground:
      There should be less than 0.2 V.
      • Poor ground (G401)
      • An open or high resistance in the ground wire
      R11 BRN In all ignition switch positions Measure the voltage to ground:
      There should be less than 0.2 V.
      • Poor ground (G401)
      • An open or high resistance in the ground wire
      R8 BLK In all ignition switch positions Measure the voltage to ground:
      There should be less than 0.2 V
      • Poor ground (G402)
      • An open or high resistance in the ground wire
      F16 WHT Under all conditions Measure the voltage to ground:
      There should be battery voltage.
      • Blown No. A15 (10 A) fuse in the under-hood fuse/relay box
      • An open or high resistance in the wire
      F23 GRN Transmission range switch in P Measure the voltage to ground:
      There should be less than 0.2 V.
      • Faulty or improperly adjusted transmission range switch
      • Poor ground (G101) or an open in the ground wire
      • An open or high resistance in the wire
      Transmission range switch in any other position than P Measure the voltage to ground:
      There should be about 5 V.      		 A short to ground in the wire
      F14 LT GRN Brake pedal pressed Measure the voltage to ground:
      There should be battery voltage.
      • Blown No. A8 (20 A) fuse in the under-hood fuse/relay box
      • Faulty brake pedal position switch
      • An open or high resistance in the wire
      Brake pedal released Measure the voltage to ground:
      There should be no voltage.
      • Faulty brake pedal position switch
      • A short to power in the wire
      R22
      .
      R9      		 ORN
      .
      BLK      		 Wiper switch (INT or LO) ON Measure the voltage between terminals R22 and R9:
      There should be less than 0.2 V.
      • Faulty wiper/washer switch
      • An open or high resistance in the wire
      Wiper switch OFF Measure the voltage between terminals R22 and R9:
      There should be about 5 V.
      • Faulty wiper/washer switch
      • A short to ground in the wire
      R21
      .
      R9      		 WHT
      .
      BLK      		 Wiper switch (LO or HI) ON Measure the voltage between terminals R21 and R9:
      There should be less than 0.2 V.
      • Faulty wiper/washer switch
      • An open or high resistance in the wire
      Wiper switch OFF Measure the voltage between terminals R21 and R9:
      There should be about 5 V.
      • Faulty wiper/washer switch
      • A short to ground in the wire
      R20
      .
      R9      		 GRN
      .
      BLK      		 Wiper switch (MIST) ON Measure the voltage between terminals R20 and R9:
      There should be less than 0.2 V.
      • Faulty wiper/washer switch
      • An open or high resistance in the wire
      Wiper switch OFF Measure the voltage between terminals R20 and R9:
      There should be about 5 V.
      • Faulty wiper/washer switch
      • A short to ground in the wire
      R19
      .
      R9      		 YEL
      .
      BLK      		 Washer switch ON Measure the voltage between terminals R19 and R9:
      There should be less than 0.2 V.
      • Faulty wiper/washer switch
      • An open or high resistance in the wire
      Washer switch OFF Measure the voltage between terminals R19 and R9:
      There should be about 5 V.
      • Faulty wiper/washer switch
      • A short to ground in the wire
      R12
      .
      R9      		 BLU
      .
      BLK      		 Wiper/washer switch (intermittent dwell timer) turned Measure the resistance between terminals R12 and R9:
      The resistance should vary from about 0 to 30 kΩ.
      • Faulty wiper/washer switch
      • An open or high resistance in the wire
      • A short to ground in the wire
      R17
      .
      R9      		 LT GRN
      .
      BLK      		 Rear window wiper switch ON Measure the voltage between terminals R17 and R9:
      There should be less than 0.2 V.
      • Faulty wiper/washer switch
      • An open or high resistance in the wire
      Rear window wiper switch OFF Measure the voltage between terminals R17 and R9:
      There should be about 5 V.
      • Faulty wiper/washer switch
      • A short to ground in the wire
      R18
      .
      R9      		 PNK
      .
      BLK      		 Rear window washer switch ON Measure the voltage between terminals R18 and R9:
      There should be less than 0.2 V.
      • Faulty wiper/washer switch
      • An open or high resistance in the wire
      Rear window washer switch OFF Measure the voltage between terminals R18 and R9:
      There should be about 5 V.
      • Faulty wiper/washer switch
      • A short to ground in the wire

    7. Passenger's MICU 

  7. Turn the ignition switch to LOCK (0), and remove the passenger's kick panel.
  8. Remove the passenger's kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREAS ).
  9. Disconnect passenger's under-dash fuse/relay box connectors A, E, and H.
    NOTE: All connector views are wire side of female terminals.
    Fig 2: Identifying Passenger's Under-Dash Fuse/Relay Box Connectors A, E, And H
    G06420366Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. 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 next step.
  11. With the connectors still disconnected, 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 next step.
      CONNECTOR INPUT TESTS REFERENCE

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      A32 PNK Ignition switch ON (II) Measure the voltage to ground:
      There should be battery voltage.
      • Blown No. B3 (15 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
      A38 BLU Under all conditions Run the rear window wiper motor by connecting terminal F3 to terminal F25, and terminal A38 to body ground:
      The rear window wiper motor should run.
      • Faulty under-hood fuse/relay box
      • Faulty relay circuit board
      • Faulty rear window wiper motor
      • An open or high resistance in the wire
      H31 PNK Run the rear window wiper motor by connecting terminal F3 to terminal F25, and terminal A38 to body ground. Check for continuity to ground:
      The needle of the ohmmeter should pulse.
      NOTE: Use an ohmmeter.
      • Faulty rear window wiper motor
      • An open or high resistance in the wire
      A21 PNK Disconnect the driver's under-dash fuse/relay box connector P (20P) Check for continuity between terminal No. 21 and driver's under-dash fuse/relay box connector P (20P) terminal No. 5:
      There should be continuity.      		 An open in the B-CAN wire
      Check for continuity to ground:
      There should be no continuity.      		 A short in the B-CAN wire
      A34 BLU Disconnect the driver's under-dash fuse/relay box connector P (20P) Check for continuity between terminal No. 34 and driver's under-dash fuse/relay box connector P (20P) terminal No. 6:
      There should be continuity.      		 An open in the B-CAN wire
      Check for continuity to ground:
      There should be no continuity.      		 A short in the B-CAN wire
  12. Reconnect the connectors to the passenger's under-dash fuse/relay box, 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 next step.
      CONNECTOR INPUT TESTS REFERENCE

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      A26 BLK In all ignition switch positions Measure the voltage to ground:
      There should be less than 0.2 V
      • Poor ground (G405)
      • An open or high resistance in the ground wire
      E15 BLK In all ignition switch positions Measure the voltage to ground:
      There should be less than 0.2 V
      • Poor ground (G203)
      • An open or high resistance in the ground wire
      E14 BLK In all ignition switch positions Measure the voltage to ground:
      There should be less than 0.2 V
      • Poor ground (G203)
      • An open or high resistance in the ground wire
      H12 BLK Under all conditions Measure the voltage to ground:
      There should be less than 0.2 V.
      • Poor ground (G701)
      • An open or high resistance in the ground wire
      H5 BLK Under all conditions Measure the voltage to ground:
      There should be less than 0.2 V.
      • Poor ground (G701)
      • An open or high resistance in the ground wire
      A18 WHT Under all conditions Measure the voltage to ground:
      There should be battery voltage.
      • Blown No. A15 (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
      A28 BRN Ignition switch ON (II) Measure the voltage to ground:
      There should be battery voltage.
      • Blown No. B5 (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
      E1 GRN Ignition switch ON (II) Connect terminals A32 and E1, and terminals E4 and H12 with jumper wires:
      The windshield washer motor should run.
      • Faulty windshield/rear window washer motor
      • Poor ground (G701)
      • An open or high resistance in the ground wire
      E4 YEL Ignition switch ON (II) Connect terminals A32 and E4, and terminals E1 and H12 with jumper wires:
      The rear window washer motor should run.
      • Faulty windshield/rear window washer motor
      • Poor ground (G701)
      • An open or high resistance in the ground wire
  13. 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).

    If input failures are related to a particular control unit, replace the control unit.

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