PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:B2000

DTC Code DTC Name
B2000 Short to B+ in Seat Belt Motor RH Circuit

DESCRIPTION

The seat belt control ECU receives collision information from the driving support ECU and skid control ECU via CAN communication, and tightens the seat belt by operating the motor inside the front seat outer belt RH.

When DTC B2000 is stored, DTCs B2016, B2026, B2027 and B2035 are not stored.

DTC Code DTC Detection Condition Trouble Area
B2000 During the initial check or with the ignition switch ON, the seat belt motor RH circuit has a power supply short (the voltage at terminals MOR+ and MOR- is 8.5 V or higher) for 1 second or more.

  • Front seat outer belt assembly RH

  • Harness or connector

  • Seat belt control ECU

WIRING DIAGRAM

A006SJEE01

INSPECTION PROCEDURE

CAUTION:

The pretensioner is built into the front seat outer belt assembly. Be sure to follow the correct inspection procedure, as failure to follow the correct procedure (such as inspection of incorrect connectors) may activate the pretensioner.

PROCEDURE


  1. CHECK FRONT SEAT OUTER BELT ASSEMBLY RH CIRCUIT

    A006TV8E01
    Text in Illustration
    *1 for LHD
    *2 for RHD
    *3

    Front view of wire harness connector

    (to Seat Belt Control ECU)

    1. Disconnect the A52*1 or D109*2 ECU connector.

      *1: for LHD

      *2: for RHD

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      A52-2 (MOR+) - Body ground Ignition switch ON Below 1 V
      A52-1 (MOR-) - Body ground
      for RHD
      Tester Connection Switch Condition Specified Condition
      D109-2 (MOR+) - Body ground Ignition switch ON Below 1 V
      D109-1 (MOR-) - Body ground
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    B

    REPLACE SEAT BELT CONTROL ECU Click here

    C

    REPLACE SEAT BELT CONTROL ECU Click here

    A

  2. CHECK HARNESS AND CONNECTOR (FRONT SEAT OUTER BELT RH - SEAT BELT CONTROL ECU)

    A006TYGE01
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Front Seat Outer Belt Assembly RH)

    1. Disconnect the H4 belt connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H4-1 (MOR+) - Body ground Ignition switch ON Below 1 V
      H4-2 (MOR-) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH Click here