How do you reset a engine warning lamp on a Hino 500 series truck?

To reset the engine warning lamp on a Hino 500 series truck, first, ensure that the underlying issue causing the warning has been resolved. Then, use a diagnostic scan tool to clear the fault codes stored in the engine control unit (ECU). If a scan tool is not available, disconnect the truck's battery for about 10-15 minutes, which may also reset the lamp. Always consult the vehicle's service manual for specific procedures and precautions.