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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSLEXUS2009GS 350 RWD V6-3.5L (2GR-FSE)REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONB CODE CHARTSB2020
2009 Lexus GS 350 RWD V6-3.5L (2GR-FSE)
B2020
2009 Lexus GS 350 RWD V6-3.5L (2GR-FSE)SECTION B2020
PRE-COLLISION: PRE-COLLISION SYSTEM: B2015: Open in Right Side Upper MOS
DTC B2015 - Open in Right Side Upper MOS
DTC B2016 - Open in Right Side Lower MOS
DTC B2020 - Open in Left Side Upper MOS
DTC B2021 - Open in Left Side Lower MOS
DTC B2025 - Right Side Current Detection Circuit Malfunction Hi
DTC B2026 - Right Side Current Detection Circuit Malfunction Lo
DTC B2027 - Right Side Over-Current Malfunction
DTC B2030 - Left Side Current Detection Circuit Malfunction Hi
DTC B2031 - Left Side Current Detection Circuit Malfunction Lo
DTC B2032 - Left Side Over-Current Malfunction
DTC B2035 - Power Supply Relay Adherence Malfunction
DTC B2040 - EEPROM Malfunction
DTC B2041 - Fall of Raised Voltage
DTC B2043 - Fall of B+ Voltage
DTC B2047 - Pre-Collision Safety ECU Inner Circuit Malfunction
DESCRIPTION
The DTCs above are output during the seat belt control ECU's self diagnosis.
INSPECTION PROCEDURE
NOTE:
When the seat belt control ECU is replaced with a new one, Active Test must be performed. Pre-Collision System
PROCEDURE
1. CHECK DTC
(a) Disconnect the negative (-) terminal cable from the battery.
(b) Connect the negative (-) terminal cable to the battery.
(c) Turn the engine switch on (IG).
(d) Clear the DTCs stored in memory. Pre-Collision System
(e) Turn the engine switch off.
(f) Turn the engine switch on (IG).
(g) Check for the DTCs. Pre-Collision System
OK:
NO DTC is output.
NG -- REPLACE SEAT BELT CONTROL ECU
OK -- USE SIMULATION METHOD TO CHECK
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.