PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:B2075

DTC Code DTC Name
B2075 Passenger Side Seat Belt Buckle Switch Circuit Malfunction

DESCRIPTION

This DTC is stored when an open or ground short is detected continuously for 1 second in the passenger side buckle switch circuit.

DTC Code DTC Detection Condition Trouble Area
B2075 Open or short to ground in the front seat inner belt assembly LH*1 or front seat inner belt assembly RH*2 (buckle switch) circuit continues for 1 second or more.

  • Front seat inner belt assembly LH*1

  • Front seat inner belt assembly RH*2

  • Seat belt control ECU

WIRING DIAGRAM

A01FG0UE01
A01FG0UE02

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK SEAT BELT CONTROL ECU


    1. Using an oscilloscope, check the waveform of the seat belt control ECU between the connector terminals.

      A01FGU5E01
      Text in Illustration
      *A Tongue plate inserted *B Tongue plate not inserted
      *a

      Component with harness connected

      (Seat Belt Control ECU)

      		 - -
      OK
      As shown in the illustration.
      Item Content
      Tester Connection U35-5 (PBK+) - U35-6 (PBK-)
      Tool Setting 2 V/DIV., 20 msec/DIV.
      Vehicle Condition Engine switch on (IG), passenger seat inner belt tongue plate not inserted → inserted

    NG

    CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT ASSEMBLY - SEAT BELT CONTROL ECU) Click here

    OK

    REPLACE SEAT BELT CONTROL ECU Click here

  2. CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT ASSEMBLY - SEAT BELT CONTROL ECU)


    1. Disconnect the U35 seat belt control ECU connector.

    2. Disconnect the T3*1 front seat inner belt assembly RH*1 or U5 front seat inner belt assembly LH*2


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      U35-5 (PBK+) - T3-1 (RBE+) Always Below 1 Ω
      U35-6 (PBK-) - T3-2 (RBE-)
      U35-5 (PBK+) - Body ground Always 1 MΩ or higher
      U35-6 (PBK-) - Body ground
      for RHD
      Tester Connection Condition Specified Condition
      U35-5 (PBK+) - U5-1 (LBE+) Always Below 1 Ω
      U35-6 (PBK-) - U5-2 (LBE-)
      U35-5 (PBK+) - Body ground Always 1 MΩ or higher
      U35-6 (PBK-) - Body ground
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    B

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here

    C

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR