Wipers/Washers (Driver's and Passenger's MICU) Input Test
Driver's MICU
  1. Turn the ignition switch to LOCK (0).
  1. Remove the driver's dashboard undercover, then remove the dashboard lower cover.
  1. Disconnect driver's under-dash fuse/relay box connectors F, Q, and R.
    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 desired result is not obtained
    Q1
    BLK
    Under all conditions
    Check for continuity to ground:
    There should be continuity.
    • Poor ground (G502)
    • An open in the wire
    Q2
    BRN
    Under all conditions
    Check for continuity to ground:
    There should be continuity.
    • Poor ground (G501)
    • An open in the wire
    R2
    BRN
    Under all conditions
    Check for continuity to ground:
    There should be continuity.
    • Poor ground (G501)
    • An open in the wire
    R5
    BLK
    Under all conditions
    Check for continuity to ground:
    There should be continuity.
    • Poor ground (G502)
    • An open in the wire

  1. Reconnect the connectors to the driver's under-dash fuse/relay box, turn the ignition switch to ON (II), 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, go to Step 7 .
    Cavity
    Wire
    Test condition
    Test: Desired result
    Possible cause if desired result is not obtained
    F4(A/T)
    GRN
    Transmission range switch in P
    Measure the voltage to ground:
    There should be less than 1 V.
    • Poor ground (G101)
    • An open in the wire
    Transmission range switch in any other position than P
    Measure the voltage to ground:
    There should be more than 5 V.
    • Faulty transmission range switch
    • A short to power in the wire
    F20
    LT GRN
    Brake pedal pressed
    Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 10 (20 A) fuse in the under-hood fuse/relay box
    • Faulty brake pedal position switch
    • An open in the wire
    Brake pedal released
    Measure the voltage to ground:
    There should be no voltage.
    • Faulty brake pedal position switch
    • A short to power in the wire
    F30
    YEL
    Ignition switch ON (II)
    Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 4 (10 A) fuse in the driver's under-dash fuse/relay box
    • Faulty driver's under-dash fuse/relay box
    • Faulty relay circuit board in the under-hood fuse/relay box
    • A short to ground in the wire
    F7
    ORN
    Ignition switch ON (II)
    Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 3-8 (WIP MTR) (30 A) fuse in the under-hood fuse/relay box
    • Poor ground (G301)
    • Faulty relay circuit board in the under-hood fuse/relay box
    • An open in the wire
    Attach to ground:
    The wiper motor should run at high speed.
    • Poor ground (G301, G302) [G201]
    • Faulty relay circuit board in the under-hood fuse/relay box
    • Faulty wiper motor
    • An open in the wire
    F8
    YEL/BLU
    Ignition switch ON (II)
    Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 3-8 (WIP MTR) (30 A) fuse in the under-hood fuse/relay box
    • An open in the wire

    [ ]:
    RHD model

    Cavity
    Wire
    Test condition
    Test: Desired result
    Possible cause if desired result is not obtained
    R15 · R4
    ORN · BLK
    Wiper switch ON at INT or LO position
    Measure the voltage between the R15 and the R4 terminals:
    There should be less than 1 V.
    • Faulty wiper/washer switch
    • An open in the wire
    Wiper switch OFF
    Measure the voltage between the R15 and the R4 terminals:
    There should be more than 5 V.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    R16 · R4
    WHT · BLK
    Wiper switch ON at LO or HI position
    Measure the voltage between the R16 and the R4 terminals:
    There should be less than 1 V.
    • Faulty wiper/washer switch
    • An open in the wire
    Wiper switch OFF
    Measure the voltage between the R16 and the R4 terminals:
    There should be more than 5 V.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    R17 · R4
    GRN · BLK
    Wiper switch ON at MIST position
    Measure the voltage between the R17 and the R4 terminals:
    There should be less than 1 V.
    • Faulty wiper/washer switch
    • An open in the wire
    Wiper switch OFF
    Measure the voltage between the R17 and the R4 terminals:
    There should be more than 5 V.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    R18 · R4
    YEL · BLK
    Washer switch ON
    Measure the voltage between the R18 and the R4 terminals:
    There should be less than 1 V.
    • Faulty wiper/washer switch
    • An open in the wire
    Washer switch OFF
    Measure the voltage between the R18 and the R4 terminals:
    There should be more than 5 V.
    • Faulty wiper/washer switch
    • A short to ground in the wire
    R1 · R4
    BLU · BLK
    Intermittent dwell timer turned
    Check resistance between the R1 and R4 terminals:
    There resistance should vary between 0 to 1 kΩ.
    • Faulty wiper/washer switch
    • An open in the wire