Grease the bottom of a 9x13 cake pan. Mix the coconut and pecans together and spread this mixture on the bottom of the greased pan. Mix the German Chocolate cake mix according to package directions. Pour this cake mix over the nuts and coconut.
Mix the powdered sugar, margarine and cream cheese together. Pour this mixture over the cake mix. The mixture will be very thick. An alternative would be to drop spoons of the mixture over the top of the cake mix.