Wipers/Washers (MICU) Input Test
NOTE: Before testing, check the No. 10 (7.5 A) and No. 38 (30 A) fuses in the under-dash fuse/relay box.
  1. Turn the ignition switch OFF.
  1. Disconnect the under-dash fuse/relay box connectors E, F, S, and T.
    NOTE: All connector views are wire side of female terminals.
  1. 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 .
  1. With the connectors still disconnected, 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, go to Step 6 .
    Cavity
    Wire
    Test condition
    Test: Desired result
    Possible cause if result is not obtained
    E6
    BLK
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G602)[G652]
    • An open in the wire
    T34
    BLK
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G503)
    • An open in the wire
    F18
    BLU
    Under all conditions
    Connect battery power to the F18 terminal: The windshield wiper motor should run at low speed.
    • Poor ground (G301)
    • Faulty windshield wiper motor
    • An open in the wire
    F19
    YEL
    Connect battery power to the F19 terminal: The windshield wiper motor should run at high speed.
    F32
    WHT
    Under all conditions (disconnect the windshield wiper motor 5P connector)
    Check for continuity between the F32 terminal and windshield wiper motor 5P connector No. 5 terminal: There should be continuity.
    An open in the wire
    F33
    ORN
    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
    Wiper/washer switch (intermittent dwell time controller) turned
    Check resistance between S6 and S4 terminals: The resistance should vary from about 0 to 30Ω.
    • Faulty wiper/washer switch
    • An open in the wire
    • A short to ground in the wire

    [ ]:
    RHD

  1. Reconnect the connectors to the under-dash fuse/relay box, and make these input tests at the connectors.
    Cavity
    Wire
    Test condition
    Test: Desired result
    Possible cause if result is not obtained
    S10·S4
    ORN·BLK
    Wiper/washer switch (LO) ON
    Check for voltage between S10 and S4 terminals: There should be less than 1 V.
    • Faulty wiper/washer switch
    • An open in the wire
    Wiper/washer switch (INT) position
    Wiper/washer switch OFF
    Check for voltage between S10 and S4 terminals: There should be 5 V or more.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    S15·S4
    GRN·BLK
    Wiper/washer switch (MIST) ON
    Check for voltage between S15 and S4 terminals: There should be less than 1 V.
    • Faulty wiper/washer switch
    • An open in the wire
    Wiper/washer switch (MIST) OFF
    Check for voltage between S15 and S4 terminals: There should be 5 V or more.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    S17·S4
    YEL·BLK
    Washer switch ON
    Check for voltage between S17 and S4 terminals: There should be less than 1 V.
    • Faulty wiper/washer switch
    • An open in the wire
    Washer switch OFF
    Check for voltage between S17 and S4 terminals: There should be 5 V or more.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    S20·S4
    WHT·BLK
    Wiper/washer switch (LO) ON
    Check for voltage between S20 and S4 terminals: There should be less than 1 V.
    • Faulty wiper/washer switch
    • An open in the wire
    Wiper/washer switch OFF
    Check for voltage between S20 and S4 terminals: There should be 5 V or more.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    Wiper/washer switch (HI) ON
    Check for voltage between S20 and S4 terminals: There should be less than 1 V.
    • Faulty wiper/washer switch
    • An open in the wire
    Wiper/washer switch OFF
    Check for voltage between S20 and S4 terminals: There should be 5 V or more.
    • Faulty wiper/washer switch
    • A short to ground in the wire