Ethics and trust are both intrinsic and intangible items. A person may be ethical for one transaction but not another. Someone may trust a person but not find them to be a ethical person and visa versa. Trust and ethics are not a measurable characteristic and can change from person to person as opposed to fact based item. Everyone has their dark-side so to be deemed as a trust-worthy person is quite a compliment but then to put the icing on the cake with the multiplier of ethical is a slam dunk! Ethics are how one operates in both a professional and personal manner and just because someone is ethical it does not ensure they are also trustworthy. Just as a trustworthy person is not necessarily ethical. Ethic's are defined differently for different individuals as is trust and the level given to a person.
In order to trust someone they must establish themselves as an ethical person to you. Ethics relate to doing what is right in a situation as such trust is put in those that have proved that they are ethical in their actions and thoughts.