PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:B2002

DTC Code DTC Name
B2002 Open 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 B2002 is stored, DTCs B2026 and B2027 are not stored.

DTC Code DTC Detection Condition Trouble Area
B2002 During the initial check or with the ignition switch ON, the seat belt motor RH circuit has an open (the voltage at terminal MOR+ is 8.5 V or higher and the voltage at terminal MOR- is below 2 V) for 1 second or more.

  • Front seat outer belt assembly RH

  • Harness or connector

  • Seat belt control ECU

WIRING DIAGRAM

A004N9XE01

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 FRONT SEAT OUTER BELT ASSEMBLY RH CIRCUIT

    A004QSKE01
    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 resistance according to the value(s) in the table below.

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A52-2 (MOR+) - A52-1 (MOR-) Always 20 Ω
      for RHD
      Tester Connection Condition Specified Condition
      D109-2 (MOR+) - D109-1 (MOR-) Always 20 Ω
      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 (SEAT BELT CONTROL ECU - FRONT SEAT OUTER BELT RH)

    A004S90E02
    Text in Illustration
    *1 for LHD
    *2 for RHD
    *3

    Front view of wire harness connector

    (to Seat Belt Control ECU)
    *4

    Front view of wire harness connector

    (to Front Seat Outer Belt Assembly RH)
    *5 Service Wire

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

      *1: for LHD

      *2: for RHD

    2. Disconnect the H4 belt connector.

    3. Using a service wire, connect terminals H4-1 (MOR+) and H4-2 (MOR-) of the connector on the front seat outer belt RH.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for LHD
      Tester Connection Connector Specified Condition
      A52-2 (MOR+) - A52-1 (MOR-) Always Below 1 Ω
      for RHD
      Tester Connection Connector Specified Condition
      D109-2 (MOR+) - D109-1 (MOR-) Always Below 1 Ω

    OK

    REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR