How do you change the cam belt on a Renault modus 1.4 16valves?

To change the cam belt on a Renault Modus 1.4 16 valves, first disconnect the battery and remove the engine cover. Then, align the timing marks on the camshaft and crankshaft pulleys to ensure proper timing, and remove the old cam belt by loosening the tensioner. Install the new cam belt, ensuring it's tight but not overly strained, and reattach the tensioner before rechecking the timing marks. Finally, reassemble any removed components and reconnect the battery before starting the engine to test the installation.