Overexposed I can`t take shots under sunlight, my pictures always get overexposed the iso setting is 320, I`ve to shoot with f22 and 2000.

Check the ISO setting...is it too high for the lighting conditions? Check the "exposure compensation"....it should be at "0". If you want darker pictures, you can set it to a lower number.

It all depends on the environment you're shooting in. When shooting a wedding reception for instance inside in the evening I will generally use ISO 800 and I quite often use FE Lock which is very handy. FE Lock will pre-flash the speedlite and meter the result based on the center focus point in your viewfinder (it doesn't matter if you have set another focus point it will always meter to the center one so make sure that is over your subject when you use it). To use FE Lock press the button near your thumb that has the * symbol with the center focus point over the subject. You can then re-frame the shot if required and take the picture. The camera will take the picture based on that flash setting and you should find that the shot is better exposed.

You could set the white balance to the full sun setting. You could set the ISO to a lower number. You could set the "exposure compensation" to a lower number.

You may have the settings wrong. Check in the MENU to see if you have it set to "inside" pics rather than outside.
Also the ISO has a lot to do with the exposure. If the iso is set too low outside sunlight pics will be white or overexposed. Try setting ISO on wheel for various options select program mode button and MENU select ISO 120 or 250. These are are pretty general settings. the flash will only engage inside or outside if the light is low ( like evening) I suspect your ISO setting is at a setting that is incompatible with bright sunlight
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Also select White Balance and move it to DAYLIGHT

take a few shots inside and out to see if there is an improvement.

Please rate my help++++Thanks for using FIXYA

Make sure the ISO is set to the lowest number or even to "auto ISO".

usually all the digital cameras have a filter to diminishes the quantity of light passed through objective. This filter is enabled by a small relay and that relay is powered by a mobile wire from the mother board. Because this wire are always moved every time when the zoom is used ,this action can cause the interruption of that wire.
The second possibility is that relay to get stuck and can`t be able to switch the filter.

Have you set the 400 ISO, or do you have the camera on Auto ISO?
Go back to your setup menus and set the Sensitivity to the lowest ISO value possible.  Now set the White Balance to Auto. Exit the menus.
Now set the camera to P for program. In effect, you have turned the camera into a point-and-shoot dimwit. It should now take reasonably well exposed shots indoor and outdoor.
If the shutter speed does not register on the body, you should put the dial on Tv and see if you can alter the speeds.  Remember, not all finctions are available for all dial settings.

Since I never use a TTL flash with my Bronica's, I'll give you my suggestion for a great solution. Using your TTL Metz flash, (make sure you've connected the TTL cord for Bronica ETRsi) take 8 shots at different apertures on A (Automatic), then take 8 shots at different apertures on M (Manual). I realize this will waste one 120 roll of film, but one negative will stand out as your perfect exposure. Yes, whenever you reduce the ISO in half, your basically overexposing the film by one f/stop. Just remember that this overexposes everything your shooting from foreground to background. With flash, this may cause your highlights to wash out, but any good lab could print for the highlights and make the background go darker. I used to shoot Vericolor at ISO 125 instead of it's rated ISO of 160. 
Fotobean

I had similar problem with D80 try removing the lens and cleaning the contacts. that seemd to work well for me.

Which mode are you shooting in?
You may have adjusted the exposure compensation so everything is washed out.

Whatever the cause, your images are overexposed. Try shooting in auto and the camera should take over the settings, but if you are in other modes, check your shutter speed, aperture, & ISO also. These are all things that can cause too much light and wash the picture out/OVEREXPOSE.

If you have any other questions or can give me more details, just ask!

Hope this helps!