Uv map disappeared

hi,so im trying to fix a uv map for a car(Shutokou Battle Extreme) after a while of editing i forgot a mesh and join it with the previous meshes and fix the uv position
unfortunately my uv map is gone but if i point my cursor at it and press G to move it,the UV position changes just like how it should be but the problem is how do i make it visible again so its easier to edit?(material is already assigned)

Try Alt H ,in your UV view