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MICU Input Test

NOTE:
  • Before doing the input tests, check the No. 5 (10 A), No. 16 (10 A), No. 21 (15 A), No. 56 (30 A), and No. 60 (IGN) (50 A) fuses in the under-dash fuse/relay box.
  • If the rear window wiper malfunctions, and no DTCs are detected, check the rear window wiper motor and for an open in the ground circuit of the rear window wiper (see step  9).
  1. Turn the ignition switch to LOCK (0).
  2. Remove the fuse access panel (see FUSE ACCESS PANEL REMOVAL/INSTALLATION ), and remove the driver's dashboard lower cover (see FUSE ACCESS PANEL REMOVAL/INSTALLATION ).
  3. Disconnect under-dash fuse/relay box connectors A, B, C, K, M, N, Q, and W.
    NOTE: All connector views are shown from wire side of female terminals.
    Fig 1: Under-Dash Fuse/Relay Box Connectors Terminals Layout
    G08094757Courtesy 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, 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 6.
      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      W1 YEL Ignition switch ON (II) Measure the voltage to ground:
      There should be battery voltage.
      • Faulty ignition switch
      • An open or high resistance in the wire
      A7 GRN Under all conditions Connect terminal A7 to battery power: The windshield wiper motor should run at high speed.
      • Poor ground (G401) or an open in the ground wire
      • Faulty windshield wiper motor
      • An open or high resistance in the wire
      A14 BLU Under all conditions Connect terminal A14 to battery power: The windshield wiper motor should run at low speed.
      A34 WHT Under all conditions Connect terminal A34 to battery power and terminal A35 to body ground: The windshield/rear window washer motor should run.
      • Faulty windshield/rear window washer motor
      • An open or high resistance in the wire
      A35 GRN Under all conditions Connect terminal A35 to battery power and terminal A34 to body ground: The windshield/rear window washer motor should run.
      • Faulty windshield/rear window washer motor
      • An open or high resistance in the wire
      B20 BLU The motor stops at auto-stop position. Check for continuity to ground:
      There should be no continuity.
      • Faulty windshield wiper motor
      • A short to ground in the wire
      Connect the terminal A14 to battery power momentarily, and stop the motor operation before the motor reaches the auto-stop position. Check for continuity to ground:
      There should be continuity.
      • Faulty windshield wiper motor
      • Poor ground (G401) or an open in the ground wire
      • An open or high resistance in the wire
      Q7(1)
      .
      Q5      		 PNK
      .
      BLK      		 Windshield wiper/washer switch (intermittent dwell timer) turned Check resistance between the terminals: The resistance should vary between 0 to 1 kΩ.
      • Faulty windshield wiper/washer switch
      • An open or high resistance in the wire
      C39
      .
      C29      		 PUR
      .
      BRN      		 Connect battery power to terminal C39, then connect terminal C29 to body ground momentarily. Check rear window wiper motor operation: The rear window wiper motor should run and stop at the park position.
      • Faulty rear window wiper motor
      • Poor ground (G801) or an open in the ground wire
      • An open or high resistance in the wire
      (1) With intermittent dwell time controller
  6. Reconnect the connectors to the 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, the MICU must be faulty; replace the under-dash fuse/relay box:
      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      K10 BLK In all ignition switch positions Measure the voltage to ground:
      There should be less than 0.2 V.
      • Poor ground (G502)
      • An open or high resistance in the wire
      M16 BLK In all ignition switch positions Measure the voltage to ground:
      There should be less than 0.2 V.
      • Poor ground (G502)
      • An open or high resistance in the wire
      N2 BLK In all ignition switch positions Measure the voltage to ground:
      There should be less than 0.2 V.
      • Poor ground (G501)
      • An open or high resistance in the wire
      Q9 BLK In all ignition switch positions Measure the voltage to ground:
      There should be less than 0.2 V.
      • Poor ground (G501)
      • An open or high resistance in the wire
      B26 PNK Transmission range switch in R Measure the voltage to ground:
      There should be less than 0.2 V.
      • Poor ground (G101) or an open in the ground wire
      • Faulty or improperly transmission range switch
      • An open or high resistance in the wire
      Transmission range switch in any other position than R Measure the voltage to ground:
      There should be at least 5 V.
      • Faulty or improperly transmission range switch
      • A short to ground in the wire
      M10
      .
      Q5      		 RED
      .
      BLK      		 Windshield wiper/washer switch (LO or HI) ON Measure the voltage between terminals M10 and Q5:
      There should be less than 0.2 V.
      • Faulty windshield wiper/washer switch
      • Poor ground (G501, G502) or an open in the ground wire
      • An open or high resistance in the wire
      Windshield wiper/washer switch OFF Measure the voltage between terminals M10 and Q5:
      There should be at least 5 V.      		 Faulty windshield wiper/washer switch
      M11
      .
      Q5      		 ORN
      .
      BLK      		 Windshield wiper/washer switch (INT or LO) ON Measure the voltage between terminals M11 and Q5:
      There should be less than 0.2 V.
      • Faulty windshield wiper/washer switch
      • Poor ground (G501, G502) or an open in the ground wire
      • An open or high resistance in the wire
      Windshield wiper/washer switch OFF Measure the voltage between terminals M11 and Q5:
      There should be at least 5 V.      		 Faulty windshield wiper/washer switch
      M12
      .
      Q5      		 GRN
      .
      BLK      		 Windshield wiper/washer switch (MIST) ON Measure the voltage between terminals M12 and Q5:
      There should be less than 0.2 V.
      • Faulty windshield wiper/washer switch
      • Poor ground (G501, G502) or an open in the ground wire
      • An open or high resistance in the wire
      Windshield wiper/washer switch OFF Measure the voltage between terminals M12 and Q5:
      There should be at least 5 V.      		 Faulty windshield wiper/washer switch
      M13
      .
      Q5      		 PUR
      .
      BLK      		 Washer switch ON Measure the voltage between terminals M13 and Q5:
      There should be less than 0.2 V.
      • Faulty windshield wiper/washer switch
      • Poor ground (G501, G502) or an open in the ground wire
      • An open or high resistance in the wire
      Washer switch OFF Measure the voltage between terminals M13 and Q5:
      There should be at least 5 V.      		 Faulty windshield wiper/washer switch
      M14
      .
      Q5      		 YEL
      .
      BLK      		 Rear window wiper/washer switch (RRWIPER) ON Measure the voltage between terminals M14 and Q5:
      There should be less than 0.2 V.
      • Faulty rear window wiper/washer switch
      • Poor ground (G501, G502) or an open in the ground wire
      • An open or high resistance in the wire
      Rear window wiper/washer switch OFF Measure the voltage between terminals M14 and Q5:
      There should be at least 5 V.      		 Faulty rear window wiper/washer switch
      M15
      .
      Q5      		 BLU
      .
      BLK      		 Rear window wiper/washer switch (RRWASH) ON Measure the voltage between terminals M15 and Q5:
      There should be less than 0.2 V.
      • Faulty rear window wiper/washer switch
      • Poor ground (G501, G502) or an open in the ground wire
      • An open or high resistance in the wire
      Rear window wiper/washer switch OFF Measure the voltage between terminals M15 and Q5:
      There should be at least 5 V.      		 Faulty rear window wiper/washer switch
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