WIPER AND WASHER SYSTEM(w/ Rain Sensor), Diagnostic DTC:B1400

DTC Code DTC Name
B1400 Rain Sensor Malfunction

DESCRIPTION

When the windshield wiper switch assembly position is set to AUTO, the rain sensor detects the amount of raindrops. According to the amount of raindrops, the rain sensor sends wiper drive request signals to the windshield wiper ECU at the optimal timings via LIN communication. Also, the vehicle speed-sensitive intermittent operation is still performed even when there is a rain sensor malfunction.

DTC Code DTC Detection Condition Trouble Area
B1400

  • The rain sensor output signal is not detected.

  • Rain sensor

  • Map light assembly

  • Harness or connector

WIRING DIAGRAM

A01X4DXE02

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • Since the wiper and washer system has functions that use LIN communication and CAN communication, first confirm that there is no malfunction in the communication system by inspecting the LIN communication functions and CAN communication in accordance with the "How to Proceed with Troubleshooting" procedures. Then, conduct the following inspection procedure.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Check the Data List for proper functioning of the rain sensor.

      Rain Sensor
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Sensor Low Temp Info Rain sensor low temp / NG or OK

      NG: Rain sensor is low temp

      OK: Rain sensor is normal

      		 -
      Sensor High Temp Info Rain sensor high temp / NG or OK

      NG: Rain sensor is high temp

      OK: Rain sensor is normal

      		 -
      OK
      The display is as specified in the normal condition.

    NG

    REPLACE RAIN SENSOR Click here

    OK

  2. INSPECT MAP LIGHT ASSEMBLY


    1. Remove the map light.


    2. A01X9P4E02

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (GND5) - 4 (GND2) Always Below 1 Ω
      14 (IG) - 29 (IG2) Always Below 1 Ω
      Result
      Result Proceed to
      OK A
      NG (w/ Sliding Roof) B
      NG (w/o Sliding Roof) C

    B

    REPLACE MAP LIGHT ASSEMBLY Click here

    C

    REPLACE MAP LIGHT ASSEMBLY Click here

    A

  3. CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - BATTERY AND BODY GROUND)


    1. A01X4O3E02
      *1 Front view of wire harness connector: (to Map Light)

      Disconnect the R7 map light connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      R7-3 (GND5) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      R7-14 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      R7-14 (IG) - Body ground Engine switch off Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - RAIN SENSOR)


    1. A01X9RIE02
      *1 Front view of wire harness connector: (to Map Light)
      *2 Front view of wire harness connector: (to Rain Sensor)

      Disconnect the R7 map light connector.

    2. Disconnect the R11 rain sensor connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      R7-4 (GND2) - R11-1 (ES) Always Below 1 Ω
      R7-29 (IG2) - R11-4 (SIG)
      R7-4 (GND2) - Body ground Always 10 kΩ or higher
      R7-29 (IG2) - Body ground

    OK

    REPLACE RAIN SENSOR Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR