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 crash 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 No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B2002

Open in Seat Belt Motor RH Circuit

During the initial check or with the engine switch on (IG), 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

Seat Belt Control ECU (Pre-Crash)

WIRING DIAGRAM

E200776E13

CAUTION / NOTICE / HINT

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 activate the pretensioner.

PROCEDURE

  1. CHECK FRONT SEAT OUTER BELT ASSEMBLY RH CIRCUIT

    1. E178608C03

      *a

      Front view of wire harness connector

      (to Seat Belt Control ECU)

      Disconnect the G34 ECU connector.

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

      Standard Resistance

      Tester Connection

      Conndition

      Specified Condition

      G34-2 (MOR+) - G34-1 (MOR-)

      Always

      Below 20 Ω

      Result

      Result

      OK

      NG
    OK

    REPLACE SEAT BELT CONTROL ECU

    Click here

    NG

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

    1. Disconnect the G34 ECU connector.

    2. Disconnect the Q3 belt connector.

    3. Using a service wire, connect terminals Q3-1 (MOR+) and Q3-2 (MOR-) of the connector of the front seat outer belt RH.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Q3-1 (MOR+) -Q3-2 (MOR-)

      Always

      Below 2 Ω

      Result

      Result

      OK

      NG
    OK

    REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH

    Click hereClick here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR