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MICU Input Test

NOTE:
  • Before performing the input tests, check the No. 16 (10 A), No. 21 (15 A), and No. 56 (30 A) fuse in the under-dash fuse/relay box.
  • If there is malfunction of the rear window wiper operation, and no DTCs are detected, check the rear window wiper motor and an open in the ground circuit of the rear window wiper (see step 9 on DTC B1028: REAR WIPER AUTO STOP SWITCH MALFUNCTION  ).
  1. Turn the ignition switch to LOCK (0).
  2. Remove the fuse access panel (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: Identifying Under-Dash Fuse/Relay Box Connectors
    G05960097Courtesy 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 these input tests at the following connectors.
    • 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 REFERENCE TABLE

    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.
    • Blown No. 60 (IGN) (50 A) fuse in the under-dash fuse/relay box
    • Faulty ignition switch
    • An open or high resistance in the wire
    A7 GRN Under all conditions Connect the terminal A7 to battery power:
    The wiper motor should run at high speed.
    • Poor ground (G301) or an open in the ground wire
    • Faulty wiper motor
    • An open or high resistance in the wire
    A14 BLU Under all conditions Connect the terminal A14 to battery power:
    The wiper motor should run at low speed.
    A34 ORN Under all conditions Connect the terminal A34 to battery power and terminal A35 to body ground:
    The washer motor should run.
    • Faulty washer motor
    • An open or high resistance in the wire
    A35 LT BLU Under all conditions Connect the terminal A35 to battery power and terminal A34 to body ground:
    The washer motor should run.
    • Faulty washer motor
    • An open or high resistance in the wire
    B20 PNK The motor stops at auto-stop position. Check for continuity to ground:
    There should be continuity.
    • Faulty wiper motor
    • Poor ground (G301) or an open in the ground wire
    • An open or high resistance in the wire
    Connect the terminal A14 to the battery power momentarily, and stop the motor operation before the motor reaches the auto-stop position. Check for continuity to ground:
    There should be no continuity.    		 Faulty wiper motor
    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 the park position.
    • Faulty rear window wiper motor
    • An open or high resistance in the wire
    • Poor ground (G602) or an open in the ground wire
  6. Reconnect the connectors to the under-dash fuse/relay box, turn the ignition switch to ON (II), and do these input tests at the following 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 (see appropriate REMOVAL AND INSTALLATION procedure ).
    TEST CONDITION REFERENCE TABLE

    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) or an open in the ground wire
    • 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 (G501) or an open in the ground wire
    • 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) or an open in the ground wire
    • 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 (G502) or an open in the ground wire
    • An open or high resistance in the wire
    M10
    .
    Q5    		 RED
    .
    BLK    		 Wiper/washer switch (LO or HI) ON Measure the voltage between terminals M10 and Q5:
    There should be less than 0.2 V.
    • Faulty wiper/washer switch
    • An open in the wire
    Wiper/washer switch OFF Measure the voltage between terminals M10 and Q5:
    There should be about 5 V or more.    		 Faulty wiper/washer switch
    M11
    .
    Q5    		 ORN
    .
    BLK    		 Wiper/washer switch (INT or LO) ON Measure the voltage between terminals M11 and Q5:
    There should be less than 0.2 V.
    • Faulty wiper/washer switch
    • An open or high resistance in the wire
    Wiper/washer switch OFF Measure the voltage between terminals M11 and Q5:
    There should be about 5 V or more.    		 Faulty wiper/washer switch
    M12
    .
    Q5    		 GRN
    .
    BLK    		 Wiper/washer switch (MIST) ON Measure the voltage between terminals M12 and Q5:
    There should be less than 0.2 V.
    • Faulty wiper/washer switch
    • An open or high resistance in the wire
    Wiper/washer switch OFF Measure the voltage between terminals M12 and Q5:
    There should be about 5 V or more.    		 Faulty 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 wiper/washer switch
    • An open or high resistance in the wire
    Washer switch OFF Measure the voltage between terminals M13 and Q5:
    There should be about 5 V or more.    		 Faulty wiper/washer switch
    M14
    .
    Q5    		 YEL
    .
    BLK    		 Rear window wiper/washer switch (RR WIPER) ON Measure the voltage between terminals M14 and Q5:
    There should be less than 0.2 V.
    • Faulty Rear window wiper/washer switch
    • 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 about 5 V or more.    		 Faulty Rear window wiper/ washer switch
    M15
    .
    Q5    		 BLU
    .
    BLK    		 Rear window wiper/washer switch (RR WASH) ON Measure the voltage between terminals M15 and Q5:
    There should be less than 0.2 V.
    • Faulty Rear window wiper/washer switch
    • 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 about 5 V or more.    		 Faulty Rear window wiper/ washer switch
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