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 there is a malfunction in the front seat inner belt buckle switch circuit for the passenger side.

DTC Code DTC Detection Condition Trouble Area
B2075 Malfunction in the front seat inner belt (buckle switch) circuit.

  • Harness or connector

  • Front seat inner belt (for passenger side)

  • Seat belt control ECU

WIRING DIAGRAM

A01X863E05

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B2075 is not output

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. CHECK SEAT BELT CONTROL ECU


    1. A01X2Z1E02
      *1 Component with harness connected: (Seat Belt Control ECU)
      *2 Seat belt is fastened (Buckle switch is on)

      Reconnect the E41 seat belt control ECU connector.

    2. Disconnect the c30*1 or c24*2 front seat inner belt connector.

      Tech Tips


      • *1: for LHD

      • *2: for RHD

    3. Use an oscilloscope to check the waveform of the seat belt control ECU between the connector terminals.

      Measurement Condition
      Tester Connection E41-5 (PBK+) - E41-6 (PBK-)
      Tool Setting 5 V/DIV., 20 ms./DIV.
      Switch Condition

      Ignition switch ON

      Front passenger side seat belt unfastened (Buckle switch off)

      Ignition switch ON

      Front passenger side seat belt fastened (Buckle switch on)
      OK
      4.5 to 5.5 V
      Result
      Result Proceed to

      OK

      (for LHD)

      		 A

      OK

      (for RHD)

      		 B
      NG C

    A

    REPLACE SEAT BELT CONTROL ECU Click here

    B

    REPLACE SEAT BELT CONTROL ECU Click here

    C

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


    1. Disconnect the c30*1 or c24*2 front seat inner belt connector.

      Tech Tips


      • *1: for LHD

      • *2: for RHD

      A01X8XME01

    2. Disconnect the E41 seat belt control ECU connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      c30-2 (+) - E41-5 (PBK+) Always Below 1 Ω
      c30-1 (E) - E41-6 (PBK-)
      c30-2 (+) or E41-5 (PBK+) - Body ground 1 MΩ higher
      c30-1 (E) or E41-6 (PBK-) - Body ground
      for RHD
      Tester Connection Condition Specified Condition
      c24-2 (+) - E41-5 (PBK+) Always Below 1 Ω
      c24-1 (E) - E41-6 (PBK-)
      c24-2 (+) or E41-5 (PBK+) - Body ground 1 MΩ higher
      c24-1 (E) or E41-6 (PBK-) - Body ground
      Result
      Result Proceed to

      OK

      (for LHD)

      		 A

      OK

      (for RHD)

      		 B
      NG C

    A

    REPLACE FRONT SEAT INNER BELT RH (for Passenger Side) Click here

    B

    REPLACE FRONT SEAT INNER BELT LH (for Passenger Side) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR