If your Location Services setting on your iPhone, iPad or iPod Touch seems grayed out and you cannot make changes to it, you may have accidentally set a restriction on it. Check the setting using these steps.
1. Open Settings.
2. Touch General.
3. Select Restrictions.
4. Tap Location Services.
5. Make sure Allow Changes is checked.
Once this is set, go back to the Location Services setting and you should be able to make changes. If none of these steps worked, you may want to go through the process of restoring your iOS device.