Recurrent cracks in brick wall
In light of my comments above I would propose treating the crack as a "control joint". These type of joints are added in large spans of masonry to control were the material cracks Side walks and large stucco walls are a good example of this.

Since your wall has already found its' least path of resistance to crack, I would have the joints that are cracked, cleaned of masonry cement totally by chiseling it out and saving as much as possible for later use. Set backer rod in the left over void pushed in to the depth of half the width of the joint and caulk the joint. You must use a high grade of caulk close to the color of the mortar to start. It will still not look right since the caulk is a solid color and the masonry cement has small subtleties that will make the caulk look bad. This is why the old cement is saved. Grind it up mortar and pistle style to get the cement in a fine grain state again, then dust the wet joint with the dust before it "skins over". If it skins over, it will render the dust unable to stick and tone the color of the caulk to the adjacent cement.