Car bonnet cables can break from corrosion of the cable or the parts becoming worn down from use, usually snapping either at the bonnet release handle or at the spring levers. Because of this tendency, if you own an old car your cable may eventually snap or become loose when you try to open your car bonnet. Fortunately, you can still get into your bonnet even with the cable broken.
Grip the bonnet release handle with pliers and pull firmly to see if it will open the bonnet. If not go to Step 2.
Locate the release catches for your bonnet. Look on the sides of your headlights for a slight indent behind the headlight. There should be a spring lever in the indent next to the headlight.
Use a coat hanger or similiar tool to catch the release cables and trigger the cable. There is normally a 1/2 inch loop at the end of the releae cable that either needs to be pushed or pulled to release the bonnet.