WIPER AND WASHER SYSTEM, Diagnostic DTC:B1279

DTC Code DTC Name
B1279 Lost Communication with Humidity/Rain Sensor LIN

DESCRIPTION

The main body ECU (multiplex network body ECU) and rain sensor communicate via LIN communication. The main body ECU (multiplex network body ECU) stores this DTC if communication becomes abnormal.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory DTC Output from
B1279 Lost Communication with Humidity/Rain Sensor LIN

    DTC Detection Condition:

  • Power switch on (IG) (IG+ voltage 9.5 V or higher)


    Malfunction Status:

  • Communication malfunction with rain sensor


    Malfunction Duration:

  • Continues for 10 seconds or more

  • Rain sensor

  • Harness or connector

  • Map light sub-assembly

 ○ Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

B0049ZWE02

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTC.

      Click here


      Body Electrical > Main Body > Clear DTCs

    2. Turn the power switch on (IG) and wait for at least 10 seconds.

    3. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      Result
      Result Proceed to
      DTC B1279 is not output. A
      DTC B1279 is output. B
      DTC B1279 and DTC B1373 are output. C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    GO TO DTC B1373 Click here

    B

  2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - RAIN SENSOR)


    1. Disconnect the P8 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the Z8*1 or a4*2 rain sensor connector.


      • *1: w/ Pre-collision System

      • *2: w/o Pre-collision System

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

      Standard Resistance
      w/ Pre-collision System
      Tester Connection Condition Specified Condition
      P8-3 (LIN3) - Z8-3 (MPX) Always Below 1 Ω
      w/o Pre-collision System
      Tester Connection Condition Specified Condition
      P8-3 (LIN3) - a4-3 (MPX) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (RAIN SENSOR - BATTERY AND BODY GROUND)


    1. B004CMOC35
      *A w/ Pre-collision System
      *B w/o Pre-collision System
      *a

      Front view of wire harness connector

      (to Rain Sensor)

      Disconnect the rain sensor connector.

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

      Standard Resistance
      w/ Pre-collision System
      Tester Connection Condition Specified Condition
      Z8-2 (ES) - Body ground Always Below 1 Ω
      w/o Pre-collision System
      Tester Connection Condition Specified Condition
      a4-2 (ES) - Body ground Always Below 1 Ω

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

      Standard Voltage
      w/ Pre-collision System
      Tester Connection Switch Condition Specified Condition
      Z8-4 (SIG) - Body ground Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      w/o Pre-collision System
      Tester Connection Switch Condition Specified Condition
      a4-4 (SIG) - Body ground Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE RAIN SENSOR Click here

    NG

  4. INSPECT MAP LIGHT SUB-ASSEMBLY


    1. Remove the map light sub-assembly.

      Click here

      B004CLHN01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-15 (IG) - A-13 (IG2) Always Below 1 Ω
      B-3 (GND) - B-12 (GND2) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    REPLACE MAP LIGHT SUB-ASSEMBLY Click here