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

DESCRIPTION

The seat belt control ECU receives information from the distance control ECU through CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly RH.

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.

DTC No.	DTC Detection Condition	Trouble Area
B2000	Short to B+ in the seat belt motor RH circuit continues for 1 second or more Short in the seat belt motor RH circuit	Front seat outer belt assembly RH Wire harness (seat belt control ECU - front seat outer belt assembly RH) Seat belt control ECU

WIRING DIAGRAM

Dtc B2000 Short To B+ In Seat Belt Motor Rh Circuit. PRE-CRASH SAFETY. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

NOTICE:

When the seat belt control ECU is replaced with a new one, INITIALIZATION must be performed .

1.INSPECT FRONT SEAT OUTER BELT ASSEMBLY RH

Dtc B2000 Short To B+ In Seat Belt Motor Rh Circuit. PRE-CRASH SAFETY. Lexus IS250 IS220d GSE20 ALE20

Disconnect the P8 connector of the front seat outer belt assembly RH.

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

Standard voltage:
Tester Connection Condition Specified Condition
P8-1 - Body ground Engine switch on (IG) Below 1 V
P8-2 - Body ground Engine switch on (IG) Below 1 V

NG

REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH

OK

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

Disconnect the negative (-) battery terminal .

Disconnect the O38 connector of the seat belt control ECU.

Connect the negative (-) terminal to the battery.

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

Standard voltage :
Tester Connection Condition Specified Condition
P8-1 - Body ground Engine switch on (IG) Below 1 V
P8-2 - Body ground Engine switch on (IG) Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

REPLACE SEAT BELT CONTROL ECU

LEXUS IS250, IS220d / GSE20 ALE20

PRE-CRASH SAFETY

Lexus IS250 IS220d GSE20 ALE20

PRE-CRASH SAFETY SYSTEM

Tester Connection	Condition	Specified Condition
P8-1 - Body ground	Engine switch on (IG)	Below 1 V
P8-2 - Body ground	Engine switch on (IG)	Below 1 V

Tester Connection	Condition	Specified Condition
P8-1 - Body ground	Engine switch on (IG)	Below 1 V
P8-2 - Body ground	Engine switch on (IG)	Below 1 V