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 engine switch on (IG), seat belt motor RH 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 RH

  • Harness and connector

  • Seat belt control ECU
B2005 During initial check or with engine 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 and connector

  • Seat belt control ECU

WIRING DIAGRAM

A001E4XE16
for RH
*a Front Seat Outer Belt RH (Seat Belt Motor RH)
*b Seat Belt Control ECU
A001E4XE12
for LH
*a Front Seat Outer Belt LH (Seat Belt Motor LH)
*b Seat Belt Control ECU

CAUTION / NOTICE / HINT

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

    A0019WLE01

    1. Disconnect the S45 ECU connector.

    2. Turn the engine switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      S45-3 (MOL+) - Body ground*1 Engine switch on (IG) Below 1 V
      S45-4 (MOL-) - Body ground*1 Engine switch on (IG) Below 1 V
      S45-2 (MOR+) - Body ground*2 Engine switch on (IG) Below 1 V
      S45-1 (MOR-) - Body ground*2 Engine switch on (IG) Below 1 V

    OK

    REPLACE SEAT BELT CONTROL ECU Click here

    NG

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

    A001A2ME01

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

    2. Turn the engine switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      S4-1 - Body ground*1 Engine switch on (IG) Below 1 V
      S4-2 - Body ground*1 Engine switch on (IG) Below 1 V
      R2-2 - Body ground*2 Engine switch on (IG) Below 1 V
      R2-1 - Body ground*2 Engine switch on (IG) Below 1 V
      Result
      Result Proceed to
      NG A
      OK (B2000 is output) B
      OK (B2005 is output) C

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    B

    REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH Click here

    C

    REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH Click here