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.
2008 Lexus SC 430FACTORY OEM SERVICE PROCEDURE
Fail-Safe Chart
WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
- INSPECT POWER WINDOW FAIL-SAFE FUNCTION
- When an abnormality is detected in the limit switch and pulse sensor for operating the jam protection function (DTC: B1231, B1232, B1233, B1234), the following power window operations will be prohibited as a fail-safe.
Standard
FAIL-SAFE CHARTPower window operation Ignition switch ON (within 43 sec.) Ignition switch OFF, key-off operation function OFF (after 43 sec.) Ignition switch OFF, key-off operation function OFF (after 43 sec.) Manual UP Operative Operation prohibited - Manual DOWN Operative Operation prohibited - AUTO UP Operation prohibited Operation prohibited - AUTO DOWN Operation prohibited Operation prohibited - UP interlocked with key operation - Operation prohibited Operation prohibited DOWN interlocked with key operation - Operation prohibited Operation prohibited UP interlocked with wireless operation - Operation prohibited Operation prohibited DOWN interlocked with wireless operation - Operation prohibited Operation prohibited HINT:
When the limit switch is functioning normally, prohibition (fail-safe function) will be canceled by fully opening or fully closing the door glass by manual operation. Then AUTO operation will be possible.
- When an abnormality is detected in the limit switch and pulse sensor for operating the jam protection function (DTC: B1231, B1232, B1233, B1234), the following power window operations will be prohibited as a fail-safe.
Factory Service Tools
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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.