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MICU Input Test

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 ), and check the No. 38 (30 A) fuse in the under-dash fuse/relay box.
  1. Turn the ignition switch to LOCK (0).
  2. Remove the driver's dashboard lower cover (see INSTRUMENT PANEL REMOVAL/INSTALLATION ).
  3. Disconnect under-dash fuse/relay box connectors E, F, R, S, and T.
    NOTE: All connector views are shown from the wire side of female terminals.
    Fig 1: Identifying MICU Connectors
    G08089080Courtesy 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 connector 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
    F18 BLU Under all conditions Connect battery power to terminal F18: The windshield wiper motor should run at low speed.
    • Poor ground (G303) or an open in the ground wire
    • Faulty windshield wiper motor
    • An open or high resistance in the wire
    F19 GRN Under all conditions Connect battery power to terminal F19: The windshield wiper motor should run at high speed.
    • Poor ground (G303) or an open in the ground wire
    • Faulty windshield wiper motor
    • An open or high resistance in the wire
    F32 RED Run the windshield wiper motor by connecting battery power to the F18 terminal. Check for continuity to ground: The needle of the ohmmeter should pulse 1 time per wiper motor cycle.
    NOTE: Use a DVOM.
    • Faulty windshield wiper motor
    • Poor ground (G303) or an open in the ground wire
    • An open or high resistance in the wire
    F33 ORN Under all conditions Connect terminal F33 to battery power and terminal F34 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
    F34 RED Under all conditions Connect terminal F34 to battery power and terminal F33 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
    S6
    .
    S4    		 BLU
    .
    BLK/WHT    		 Wiper/washer switch (intermittent dwell timer) turned Measure the resistance between the terminals S6 and S4: There resistance should vary between 0 to 1 kΩ.
    • Faulty wiper/washer switch
    • An open or high resistance in the wire
    • A short to ground in the wire
  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 (see REMOVAL AND INSTALLATION ).
    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    E6 BLK 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
    T34
    F20
    • Poor ground(G501)
    • An open or high resistance in the ground wire
    S10
    .
    S4    		 ORN
    .
    BLK/WHT    		 Wiper switch (INT or LO) ON Measure the voltage between terminals S10 and S4: 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 S10 and S4: There should be at least 5 V.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    • Faulty MICU
    S20
    .
    S4    		 RED/BLK
    .
    BLK/WHT    		 Wiper switch (LO or HI) ON Measure the voltage between terminals S20 and S4: 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 S20 and S4: There should be at least 5 V.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    • Faulty MICU
    S16
    .
    S4    		 GRN
    .
    BLK/WHT    		 Wiper switch (MIST) ON Measure the voltage between terminals S16 and S4: 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 S16 and S4: There should be at least 5 V.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    • Faulty MICU
    S17
    .
    S4    		 YEL
    .
    BLK/WHT    		 Washer switch ON Measure the voltage between terminals S17 and S4: 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 S17 and S4: There should be at least 5 V.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    • Faulty MICU
    S3 YEL/BLK Under all conditions Measure the voltage to ground: There should be battery voltage.
    • Blown No. 13 (10 A) fuse in the auxiliary under-hood fuse/relay box
    • Faulty rear window wiper motor relay 1 (forward)
    • An open or high resistance in the wire
    Connect a jumper wire to ground: The rear window wiper motor should work (forward).
    • Poor ground (G303) or an open in the ground wire
    • Faulty rear window wiper motor
    • Faulty rear window wiper motor relay 1 (forward)
    • Faulty rear window wiper motor relay 2 (backward)
    • An open or high resistance in the wire
    R12 YEL/GRN Under all conditions Measure the voltage to ground: There should be battery voltage.
    • Blown No. 13 (10 A) fuse in the auxiliary under-hood fuse/relay box
    • Faulty rear window wiper motor relay 2 (backward)
    • An open or high resistance in the wire
    Connect a jumper wire to ground: The rear window wiper motor should work (backward).
    • Poor ground (G303) or an open in the ground wire
    • Faulty rear window wiper motor
    • Faulty rear window wiper motor relay 1 (forward)
    • Faulty rear window wiper motor relay 2 (backward)
    • An open or high resistance in the wire
    S2 YEL Rear wiper in park position Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G601) or an open in the ground wire
    • Faulty rear window wiper motor
    • An open or high resistance in the wire
    Rear wiper in any other position than park position Measure the voltage to ground: There should be at least 5 V.
    • Faulty rear window wiper motor
    • A short to ground in the wire
    • Faulty MICU
    T27 BRN Rear wiper in rise/return position or park position Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G601) or an open in the ground wire
    • Faulty rear window wiper motor
    • An open or high resistance in the wire
    Rear wiper in any other position than rise/return position or park position Measure the voltage to ground: There should be at least 5 V.
    • Faulty rear window wiper motor
    • A short to ground in the wire
    • Faulty MICU
    S8
    .
    S4    		 GRN/RED
    .
    BLK/WHT    		 Rear window washer switch ON Measure the voltage between terminals S8 and S4: 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 S8 and S4: There should be at least 5 V.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    • Faulty MICU
    S9
    .
    S4    		 WHT
    .
    BLK/WHT    		 Rear window wiper switch ON Measure the voltage between terminals S9 and S4: 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 S9 and S4: There should be at least 5 V.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    • Faulty MICU
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