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MICU Input Test

  1. Before troubleshooting the wiper/washer system, troubleshoot the B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ), and check the No. 10 (7.5 A) and No. 38 (30 A) fuses in the under-dash fuse/relay box.
  2. Disconnect the under-dash fuse/relay box connectors E, F, S, and T.
    NOTE: All connector views are shown from wire side of female terminals.
    Fig 1: Identifying Under-Dash Fuse/Relay Box Connectors
    G06268811Courtesy 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 step 4.
  4. With the connectors 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 5.
      TEST CONDITION CHART

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      F18 BLU Under all conditions Connect battery power to the F18 terminal:
      The windshield wiper motor should run at low speed.
      • Poor ground (G201)
      • Faulty windshield wiper motor
      • An open in the wire
      F19 YEL Under all conditions Connect battery power to the F19 terminal:
      The windshield wiper motor should run at high speed.
      • Poor ground (G201)
      • Faulty windshield wiper motor
      • An open in the wire
      F32 WHT Under all conditions (disconnect the wiper motor 5P connector) Check for continuity between the F32 terminal and wiper motor 5P connector No. 5 terminal:
      There should be continuity.      		 An open in the wire
      F33 WHT Under all conditions Connect battery power to the F33 terminal:
      The windshield washer motor should run.
      • Poor ground (G201)
      • Faulty windshield washer motor
      • An open in the wire
      S6
      .
      S4      		 BLU
      .
      BLK      		 Windshield wiper/ washer switch (intermittent dwell timer) turned Check resistance between S6 and S4 terminals:
      There resistance should vary from about 0 to 1 kΩ.
      • Faulty windshield wiper/ washer switch
      • An open in the wire
      • A short to ground in the wire
  5. 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
      S10 ORN Ignition switch ON (II), windshield wiper /washer switch (INT) ON Check for voltage between S10 and S4 terminals, and S20 and S4 terminals:
      There should be less than 1 V.
      • Faulty wiper/washer switch
      • An open in the wire
      Ignition switch ON (II), windshield wiper /washer switch OFF Check for voltage between S10 and S4 terminals, and S20 and S4 terminals:
      There should be 5 V or more.
      • Faulty windshield wiper/ washer switch
      • A short to ground in the wire
      S15 GRN Ignition switch ON (II), windshield wiper /washer switch (MIST) ON Check for voltage between S15 and S4 terminals:
      There should be less than 1 V.
      • Faulty windshield wiper/ washer switch
      • An open in the wire
      Ignition switch ON (II), windshield wiper /washer switch (MIST) OFF Check for voltage between S15 and S4 terminals:
      There should be 5 V or more.
      • Faulty windshield wiper/ washer switch
      • A short to ground in the wire
      S17 YEL Ignition switch ON (II), windshield washer switch ON Check for voltage between S17 and S4 terminals:
      There should be less than 1 V.
      • Faulty windshield wiper/ washer switch
      • An open in the wire
      Ignition switch ON (II), windshield washer switch OFF Check for voltage between S17 and S4 terminals:
      There should be 5 V or more.
      • Faulty windshield wiper/ washer switch
      • A short to ground in the wire
      S20 WHT Ignition switch ON (II), windshield wiper /washer switch (LOW) ON Check for voltage between S20 and S4 terminals:
      There should be less than 1 V.
      • Faulty windshield wiper/ washer switch
      • An open in the wire
      Ignition switch ON (II), windshield wiper /washer switch OFF Check for voltage between S20 and S4 terminals:
      There should be 5 V or more.
      • Faulty windshield wiper/ washer switch
      • A short to ground in the wire
      WHT Ignition switch ON (II), windshield wiper /washer switch (HIGH) ON Check for voltage between S20 and S4 terminals:
      There should be less than 1 V.
      • Faulty windshield wiper/ washer switch
      • An open in the wire
      Ignition switch ON (II), windshield wiper /washer switch OFF Check for voltage between S20 and S4 terminals:
      There should be 5 V or more.
      • Faulty windshield wiper/ washer switch
      • A short to ground in the wire
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