A fuse is always a possibility, but in this case it is very unlikely. Probably the most common cause of a no-start with no sounds would be the neutral safety switch. You can try shifting to neutral to see if it will crank that way. If it does, try it in park again.
Next, look in the fuse box under the hood. There will be a chart showing the locations of all of the relays. Find the starter relay and switch it with another one that looks just like it. The ASD is a good one, or one of the radiator fan relays too. Relays don't fail very often but if it cranks now, the old starter relay is defective.
One way to test over half of the system and verify it's working is to "jump" the relay contacts in the socket. There are two ways to do that. If it works, the engine will crank. If you want it to stay running when you do that, be sure it's in park, and turn the ignition switch to "run". If you just want to test the starter circuitry, leave the ignition switch off. Keep in mind that if you forget to put it in park, and the ignition switch is on, it can start in gear. If the car doesn't run you over you'll be chasing it down the driveway. People will laugh at you so it's just safer to be sure it's in park.
One way to jump the relay is to remove it, then use a piece of wire or a stretched out paper clip to connect terminals 30 and 87 together. Do that just long enough to see if it cranks or to get the engine started. There will be enough current going through that paper clip to make it hot if you wait long enough.
Another way is to pry the cover off the relay and reinstall it that way. Then you can squeeze the flipper on one side to actuate it. Again, if the starter cranks the engine, we will know that two of the four circuits are working.
Wednesday, May 4th, 2011 AT 8:14 PM