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 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 During initial check or with power switch ON (IG), seat belt motor RH side circuit has power supply short (terminal MOR+ and MOR- are 8.5 V or more) for 1 second or more

  • Front seat outer belt RH

  • Harness or connector

  • Seat belt control ECU
B2005 During initial check or with power switch ON (IG), seat belt motor LH side circuit has power supply short (terminal MOL+ and MOL- are 8.5 V or more) for 1 second or more

  • Front seat outer belt LH

  • Harness or connector

  • Seat belt control ECU

WIRING DIAGRAM

A01H1WZE16
A01H1WZE12

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 SEAT BELT CONTROL ECU

    A01H0LEE06

    1. Disconnect the S45 ECU connector.

    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
      S45-3 (MOL+) - Body ground Power switch ON (IG) Below 1 V
      S45-4 (MOL-) - Body ground Power switch ON (IG) Below 1 V
      for RH
      Tester Connection Switch Condition Specified Condition
      S45-2 (MOR+) - Body ground Power switch ON (IG) Below 1 V
      S45-1 (MOR-) - Body ground Power switch ON (IG) Below 1 V

    NG

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

    OK

    REPLACE SEAT BELT CONTROL ECU Click here

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

    A01GZGBE05

    1. Disconnect the S4*1 and R2*2 belt connectors.

    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
      S4-1 - Body ground Power switch ON (IG) Below 1 V
      S4-2 - Body ground Power switch ON (IG) Below 1 V
      for RH
      Tester Connection Switch Condition Specified Condition
      R2-2 - Body ground Power switch ON (IG) Below 1 V
      R2-1 - 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

    REPAIR OR REPLACE HARNESS OR CONNECTOR