PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:B2000, B2005

DTC Code DTC Name
B2000 Short to B+ in Seat Belt Motor RH Circuit
B2005 Short to B+ in Seat Belt Motor LH Circuit

DESCRIPTION

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

When DTC B2000 is detected, DTCs B2016, B2026, B2027, and B2035 will not be detected.

When DTC B2005 is detected, DTCs B2021, B2031, B2032, and B2035 will not be detected.

DTC Code DTC Detection Condition Trouble Area
B2000 Short to the power supply in the seat belt motor RH circuit continues for 1 second or more.

  • Front seat outer belt assembly RH

  • Seat belt control ECU

  • Harness or connector
B2005 Short to the power supply in the seat belt motor LH circuit continues for 1 second or more.

  • Front seat outer belt assembly LH

  • Seat belt control ECU

  • Harness or connector

WIRING DIAGRAM

A01FRF6E01
A01FRF6E05

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. INSPECT FRONT SEAT OUTER BELT ASSEMBLY

    A01FQXZE01
    Text in Illustration
    *a

    Component without harness connected

    (Front Seat Outer Belt Assembly)

    1. Disconnect the front seat outer belt assembly RH or front seat outer belt assembly LH connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      1 - Body ground Power switch on (IG) Below 1 V
      2 - Body ground Power switch on (IG) Below 1 V
      Result
      Result Proceed to
      NG A
      OK (B2000 is output) B
      OK (B2005 is output) C

    B

    REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH Click here

    C

    REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH Click here

    A

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

    A01FUJXE01
    Text in Illustration
    *A for LH
    *B for RH
    *a

    Front view of wire harness connector

    (to Front Seat Outer Belt Assembly)

    1. Disconnect the front seat outer belt assembly LH*1 or front seat outer belt assembly RH*2 connector.


      • *1: for LH

      • *2: for RH

    2. Turn the power switch on (IG).

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

      Standard Voltage
      for LH
      Tester Connection Switch Condition Specified Condition
      U1-1 - Body ground Power switch on (IG) Below 1 V
      U1-2 - Body ground Power switch on (IG) Below 1 V
      for RH
      Tester Connection Switch Condition Specified Condition
      T9-1 - Body ground Power switch on (IG) Below 1 V
      T9-2 - Body ground Power switch on (IG) Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE SEAT BELT CONTROL ECU Click here