PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:B2002, B2007

DTC Code DTC Name
B2002 Open in Seat Belt Motor RH Circuit
B2007 Open 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 B2002 is detected, DTCs B2026 and B2027 will not be detected.

When DTC B2007 is detected, DTCs B2031 and B2032 will not be detected.

DTC Code DTC Detection Condition Trouble Area
B2002 During initial check or with power switch ON (IG), seat belt motor RH side circuit has open (terminal MOR+ is 8.5 V or more and MOR- is below 2 V) for 1 second or more
  • Front seat outer belt RH

  • Harness or connector

  • Seat belt control ECU

B2007 During initial check or with power switch ON (IG), seat belt motor LH side circuit has open (terminal MOL+ is 8.5 V or more and MOL- is below 2 V) for 1 second or more
  • Front seat outer belt LH

  • Harness or connector

  • Seat belt control ECU

WIRING DIAGRAM

A000XUGE16
for RH
*a Front Seat Outer Belt RH (Seat Belt Motor RH)
*b Seat Belt Control ECU
A000XUGE12
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

    A000WQIE02

    1. Disconnect the S45 ECU connector.

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

      Standard resistance
      for LH
      Tester Connection Condition Specified Condition
      S45-3 (MOL+) - S45-4 (MOL-) Always Below 2 Ω
      for RH
      Tester Connection Condition Specified Condition
      S45-2 (MOR+) - S45-1 (MOR-) Always Below 2 Ω

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

    A000YY9E01

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

    2. Disconnect the S45 ECU connector.

    3. Using a service wire, connect S4-1*1 or R2-1*2 and S4-2*1 or R2-2*2 of the connector on the front seat outer belt.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S45-2 (MOR+) - S45-1 (MOR-) Always Below 2 Ω
      S45-3 (MOL+) - S45-4 (MOL-) Always Below 2 Ω
      Result
      Result Proceed to
      NG A
      OK (B2002 is output) B
      OK (B2007 is output) C

    A
    B
    C