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 CHARTSB2020
2012 Lexus CT 200h L4-1.8L (2ZR-FXE) Hybrid
B2020
2012 Lexus CT 200h L4-1.8L (2ZR-FXE) HybridSECTION B2020
PRE-COLLISION: PRE-COLLISION SYSTEM: B2015, B2016, B2020, B2021, B2025-B2027, B2030-B2032, B2035, B2040, B2041, B2043, B2047: Open in Right Side Upper MOS
B2015 - Open in Right Side Upper MOS
B2016 - Open in Right Side Lower MOS
B2020 - Open in Left Side Upper MOS
B2021 - Open in Left Side Lower MOS
B2025 - Right Side Current Detection Circuit Malfunction Hi
B2026 - Right Side Current Detection Circuit Malfunction Lo
B2027 - Right Side Over-Circuit Malfunction
B2030 - Left Side Current Detection Circuit Malfunction Hi
B2031 - Left Side Current Detection Circuit Malfunction Lo
B2032 - Left Side Over-Circuit Malfunction
B2035 - Power Supply Relay Adherence Malfunction
B2040 - EEPROM Malfunction
B2041 - Fall of Raised Voltage
B2043 - Fall of B+ Voltage
B2047 - Seat Belt Control ECU Inner Circuit Malfunction
DESCRIPTION
The DTCs above are stored during seat belt control ECU self-diagnosis.
HINT
* When DTC B2015 or B2016 is detected, DTCs B2026 and B2027 will not be detected.
* When DTC B2020 or B2021 is detected, DTCs B2031 and B2032 will not be detected.
INSPECTION PROCEDURE
PROCEDURE
1. CHECK DTC OUTPUT
(a) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision / Trouble Codes.
(b) Clear the DTCs Pre-Collision System.
(c) Turn the power switch off.
(d) Turn the power switch on (IG).
(e) Recheck for DTCs.
OK:
DTCs are not output.
NG -- REPLACE SEAT BELT CONTROL ECU Removal
OK -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) How To Proceed With Troubleshooting
RENDER: 1.0x
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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.