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 short or open in the front seat inner belt buckle switch circuit (for passenger side).

DTC No. DTC Detection Condition Trouble Area
B2075 Open or short in front seat inner belt (buckle switch) circuit

  • Front seat inner belt (for passenger side)

  • Seat belt control ECU

  • Wire harness

WIRING DIAGRAM

A01JCSEE07
A01JCSEE06

INSPECTION PROCEDURE

PROCEDURE


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


    1. Disconnect the front seat inner belt LH connector.

    2. A01JAR7E06
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Front Seat Inner Belt)
      *2

      Front view of wire harness connector

      (to Seat Belt Control ECU)
      *3 for RHD
      *4 for LHD

      Disconnect the seat belt control ECU connector.

    3. Measure the resistance of the wire harness side connectors.

      Measure the resistance of the wire harness side connectors.

      Standard Resistance (for RHD)
      Tester Connection Condition Specified Condition
      L3-4 (RBL+) - S22-5 (RBE+) Always Below 1 Ω
      L3-3 (RBL-) - S22-4 (RBE-) Always Below 1 Ω
      L3-4 (RBL+) or S22-5 (RBE-) - Body ground Always 10 kΩ or higher
      L3-3 (RBL-) or S22-4 (RBE-) - Body ground Always 10 kΩ or higher
      Standard Resistance (for LHD)
      Tester Connection Condition Specified Condition
      L3-5 (LBL+) - R5-5 (LBE+) Always Below 1 Ω
      L3-6 (LBL-) - R5-4 (LBE-) Always Below 1 Ω
      L3-5 (LBL+) or R5-5 (LBE+) - Body ground Always 10 kΩ or higher
      L3-6 (LBL-) or R5-4 (LBE-) - Body ground Always 10 kΩ or higher

    4. Reconnect the seat belt control ECU connector.

    5. Reconnect the front seat inner belt connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT SEAT INNER BELT LH - SEAT BELT CONTROL ECU)

    OK

  2. CHECK SEAT BELT CONTROL ECU


    1. A01JB3OE03
      Text in Illustration
      *1 Seat Belt Control ECU

      Fasten the passenger side seat belt.

    2. Turn the power switch on (IG).

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

      Tech Tips

      Voltage is only output for 10 ms of a 100 ms cycle.

      Item Contents
      Terminal

      L3-5 (LBL+)

      L3-6 (LBL-)

      L3-4 (RBL+)

      L3-3 (RBL-)
      Tool setting 2 V/DIV, 20 ms/DIV
      Vehicle Condition Power switch on (IG)
      OK
      Approximately 5 V

    NG

    REPLACE FRONT SEAT INNER BELT (for Passenger Side)

    OK

    REPLACE SEAT BELT CONTROL ECU Click here