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 information from the driving support ECU assembly using CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly RH.

DTC No. DTC Detection Condition Trouble Area
B2000 Short to B+ in the seat belt motor RH circuit continues for 1 second or more.

  • Front seat outer belt assembly RH

  • Wire harness or connector (seat belt control ECU - front seat outer belt assembly RH)

  • Seat belt control ECU

WIRING DIAGRAM

A01G996E05

INSPECTION PROCEDURE

CAUTION:

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

PROCEDURE


  1. INSPECT FRONT SEAT OUTER BELT ASSEMBLY RH


    1. A01G5K8E07
      Text in Illustration
      *a

      Component without harness connected

      (Front Seat Outer Belt Assembly RH)

      Disconnect the Q21 front seat outer belt assembly RH connector.

      Tech Tips

      Do not remove the front seat outer belt assembly RH.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Q21-1 - Body ground Engine switch on (IG) Below 1 V
      Q21-2 - Body ground Engine switch on (IG) Below 1 V

      CAUTION:

      Do not check the wrong connector.


    NG

    REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH Click here

    OK

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


    1. A01G7FUE05
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Seat Belt Control ECU)

      Disconnect the H77 seat belt control 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 Condition Specified Condition
      H77-1 (MOR-) - Body ground Engine switch on (IG) Below 1 V
      H77-2 (MOR+) - Body ground Engine switch on (IG) Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE SEAT BELT CONTROL ECU Click here