B2005

PRE-COLLISION: PRE-COLLISION SYSTEM: B2000: Short to B+ in Seat Belt Motor RH Circuit

DTC B2000 - Short to B+ in Seat Belt Motor RH Circuit

DTC 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.






WIRING DIAGRAM









INSPECTION PROCEDURE
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




(a) Disconnect the S45 ECU connector.
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:





HINT:
*1: for LH
*2: for RH

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




(a) Disconnect the S4*1 and R2*2 belt connectors.
HINT:
*1: for LH
*2: for RH
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:






Result





C -- REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH
B -- REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH
A -- REPAIR OR REPLACE HARNESS OR CONNECTOR