Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2012CT 200H L4-1.8L (2ZR-FXE) HYBRIDREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONB CODE CHARTSB2001
2012 Lexus CT 200h L4-1.8L (2ZR-FXE) Hybrid
B2001
2012 Lexus CT 200h L4-1.8L (2ZR-FXE) HybridSECTION B2001
PRE-COLLISION: PRE-COLLISION SYSTEM: B2001: Short to GND in Seat Belt Motor RH Circuit
B2001 - Short to GND in Seat Belt Motor RH Circuit
DESCRIPTION
The seat belt control ECU receives information from the driving support ECU using CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly RH.
WIRING DIAGRAM
INSPECTION PROCEDURE
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.
NOTICE:
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Service Precautions.
PROCEDURE
1. INSPECT FRONT SEAT OUTER BELT ASSEMBLY RH
(a) Disconnect the front seat outer belt assembly RH connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) Reconnect the front seat outer belt assembly RH connector.
NG -- REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH Removal
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY RH - SEAT BELT CONTROL ECU)
(a) Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
(b) Disconnect the front seat outer belt assembly RH connector.
(c) Disconnect the seat belt control ECU connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(e) Reconnect the seat belt control ECU and front seat outer belt assembly RH connectors.
(f) Connect the cable to the negative (-) battery terminal.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY RH - SEAT BELT CONTROL ECU)
OK -- REPLACE SEAT BELT CONTROL ECU Removal
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.