2. Check the bonnet cable. The bonnet cable is a metal cable that runs from the bonnet release lever to the bonnet latch. If the cable is broken, the bonnet will not be able to open. You can check the cable by looking under the car near the bonnet latch. If the cable is broken, you will need to replace it.
3. Try to open the bonnet manually. If the bonnet release lever and cable are both working properly, you may be able to open the bonnet manually. To do this, you will need to use a screwdriver or other tool to pry open the bonnet latch. Be careful not to damage the bonnet or the latch.
4. If you are unable to open the bonnet yourself, you will need to take your car to a mechanic. The mechanic will be able to diagnose the problem and repair it.