WIPER AND WASHER SYSTEM TERMINALS OF ECU


  1. CHECK WINDSHIELD WIPER SWITCH ASSEMBLY

    B0002KHN01

    1. Disconnect the K24 and K25 windshield wiper switch assembly connectors.

    2. Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      K24-2 (+B) - Body ground R - Body ground Engine switch on (IG) signal (Power source circuit) Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      K24-3 (TAIL) - Body ground*1 LG - Body ground Headlight dimmer switch position signal Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      K24-4 (RLY2) - Body ground R - Body ground INT relay operation signal Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      K24-5 (RLY1) - Body ground B - Body ground WIP relay operation signal Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      K24-7 (E) - Body ground BR - Body ground Ground Always Below 1 Ω
      K25-4 (EW) - Body ground*2 W-B - Body ground Ground Always Below 1 Ω
      K25-7 (EW) - Body ground*3 W-B - Body ground Ground Always Below 1 Ω

      • *1: w/ Auto Wiper System

      • *2: for LHD, RHD (for Wiper Switch RH Side Type)

      • *3: for RHD (for Wiper Switch LH Side Type)

      Tech Tips

      If the result is not as specified, there may be a malfunction in the wire harness.

    3. Reconnect the K24 and K25 windshield wiper switch assembly connectors.

    4. Measure the voltage and check for pulses according to the value(s) in the table below.

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      K24-3 (TAIL) - Body ground*1 LG - Body ground Headlight dimmer switch position signal Engine switch on (IG), headlight dimmer switch in off position 11 to 14 V
      Engine switch on (IG), headlight dimmer switch in on position Below 1 V
      K24-4 (RLY2) - Body ground R - Body ground INT relay operation signal Engine switch on (IG), wiper switch off 11 to 14 V
      Engine switch on (IG), wiper switch in HI position Below 1 V
      K24-5 (RLY1) - Body ground B - Body ground WIP relay operation signal Engine switch on (IG), wiper switch off 11 to 14 V
      Engine switch on (IG), wiper switch in LO position Below 1 V
      K24-8 (MPX1) - Body ground*1 G - Body ground LIN communication signal Engine switch on (IG) Pulse generation
      K24-10 (CSS+) - K24-9 (CSS-) R - L Vehicle speed signal Engine switch on (IG), wheel being rotated Pulse generation
      K24-20 (+S) - Body ground G - Body ground Wiper motor operation signal Engine switch on (IG), wiper switch off 11 to 14 V
      Engine switch on (IG), wiper switch in LO or HI position Below 1 V
      K25-4 (WF) - Body ground*2 R - Body ground Washer motor operation signal Engine switch on (IG), washer switch off 11 to 14 V
      Engine switch on (IG), washer switch on Below 1 V
      K25-7 (WF) - Body ground*3 R - Body ground Washer motor operation signal Engine switch on (IG), washer switch off 11 to 14 V
      Engine switch on (IG), washer switch on Below 1 V

      • *1: w/ Auto Wiper System

      • *2: for RHD (for Wiper Switch LH Side Type)

      • *3: for LHD, RHD (for Wiper Switch RH Side Type)

      Tech Tips

      If the result is not as specified, the windshield wiper switch assembly may be malfunctioning.

  2. CHECK HEADLIGHT CLEANER CONTROL RELAY (w/ Headlight Cleaner System)

    B0002LGN05

    1. Disconnect the A48 headlight cleaner control relay connector.

    2. Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      A48-3 (IG) - Body ground B - Body ground Engine switch on (IG) signal (Power source circuit) Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      A48-4 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A48-6 (PB) - Body ground W - Body ground Headlight cleaner motor operation signal Always 11 to 14 V

      Tech Tips

      If the result is not as specified, there may be a malfunction in the wire harness.

  3. CHECK NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH (w/ Headlight Cleaner System)

    B003UQGN21

    1. Measure the voltage according to the value(s) in the table below.

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      q1-18 (FRWA) - Body ground R - Body ground Washer switch operation signal Engine switch on (IG), washer switch off 5 V
      Engine switch on (IG), washer switch on Below 1 V
      q1-7 (HLC) - Body ground R - Body ground Headlight cleaner operation signal Engine switch on (IG), headlight cleaner not operating 11 to 14 V
      Engine switch on (IG), headlight cleaner operating Below 1 V

      Tech Tips

      If the result is not as specified, the headlight leveling ECU assembly may be malfunctioning.