WIPER AND WASHER SYSTEM TERMINALS OF ECU


  1. CHECK WINDSHIELD WIPER SWITCH ASSEMBLY


    1. A01QAZAE04

      Disconnect the K29 and K30 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
      K29-2 (+B) - Body ground SB - Body ground Engine switch on (IG) signal (Power source circuit) Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      K29-3 (TAIL) - Body ground*1 G - Body ground Headlight dimmer switch position signal Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      K29-4 (RLY2) - Body ground P - Body ground INT relay operation signal Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      K29-5 (RLY1) - Body ground GR - Body ground WIP relay operation signal Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      K29-7 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω
      K30-4 (EW) - Body ground*2 W-B - Body ground Ground Always Below 1 Ω
      K30-7 (EW) - Body ground*3 W-B - Body ground Ground Always Below 1 Ω

      • *1: w/ Rain Sensor

      • *2: for LHD

      • *3: for RHD

      Tech Tips

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

    3. Reconnect the K29 and K30 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
      K29-3 (TAIL) - Body ground* G - 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
      K29-4 (RLY2) - Body ground P - Body ground INT 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
      K29-5 (RLY1) - Body ground GR - Body ground WIP 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
      K29-8 (MPX1) - Body ground* W - Body ground LIN communication signal Engine switch on (IG) Pulse generation
      K29-10 (CSS+) - K29-9 (CSS-) L - LG Vehicle speed signal Engine switch on (IG), wheel being rotated Pulse generation
      K29-20 (+S) - Body ground Y - Body ground Wiper motor operation signal Engine switch on (IG), wiper switch off (Wiper blades are at stop (park) position) Below 1 V
      Engine switch on (IG), wiper switch in LO or HI position 11 to 14 V
      K30-7 (WF) - Body ground B - 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

      • *: w/ Auto Wiper System

      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)


    1. A01QATUE02

      Disconnect the 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.

      Tech Tips

      The voltage cannot be measured with the connector connected to the headlight cleaner control relay as the connector is watertight.

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      A16-3 (IG) - Body ground G - Body ground Engine switch on (IG) signal (Power source circuit) Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      A16-4 (E) - Body ground G - Body ground Ground Always Below 1 Ω
      A16-6 (PB) - Body ground W - Body ground Headlight cleaner motor operation signal Always 11 to 14 V
      A16-2 (H) - Body ground L - Body ground Headlight cleaner control relay operation signal Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V

      Tech Tips

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

  3. HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY RH (w/ Headlight Cleaner System)


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

      B002E3BE10

      Tech Tips

      The voltage cannot be measured with the connector connected to the headlight light control ECU sub-assembly RH as the connector is watertight.

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      A30-7 (HLC) - Body ground L - 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
      A30-18 (FRWA) - Body ground R - Body ground Washer switch operation signal Engine switch on (IG), washer switch off 11 to 14 V
      Engine switch on (IG), washer switch on Below 1 V

      Tech Tips

      If the result is not as specified, the headlight light control ECU sub-assembly RH may be malfunctioning.