If your Honda Stream's power steering system is making noise, such as a whining or squealing sound, it could be due to low power steering fluid, a worn-out power steering belt, or a malfunctioning power steering pump. Start by checking the power steering fluid level and topping it off if necessary. If the fluid level is adequate, inspect the power steering belt for signs of wear or looseness. If the belt is in good condition, have the power steering pump inspected and tested for any issues. Refer to the Honda Stream automotive repair manual for specific troubleshooting steps and repair procedures.