- Welcome to our page how starting systems work in our website.
- We will provide for you information about how the starting system works in your vehicle, we will mention the parts that the starting system has, this will allow you to understand what has to take place for your car to start.
- Click on image to learn how to replace the ignition switch on a 93 or newer VW Passat, VW Jetta, VW Golf, VW GTI, VW Corrado.
- Click on image to learn how to replace the ignition switch in a 1984-1991 BMW 325
Click on image to learn how to diagnose and replace a bad Ignition switch on 97-2005 chevy and GMC trucks, Tahoe, Suburban, Blazer among others
- Starter assbly
- 12 volt optima battery
How starting systems work...
The starting system is composed of a minimum of 5 important items,ignition lock and key assbly, ignition switch, a 12 volt battery, and of course a starter and starter solenoid.
Even though this are the 5 items found on all vehicles, they were the only items needed to start older vehicles, not any more, as technology moves forward, new items are added to our automobiles.
The principle remains the same, electrical current is sent from the battery to the starter through an ignition switch attached or operated by an ignition lock and key assbly, when you turn your key clockwise in your car, the ignition switch makes contact with the wire that sends power to the starter solenoid, this is a small wire, it only sends the signal to the starter solenoid, there is a larger gauge wire that comes directly from the battery, and is attached to a starter solenoid who is attached to the starter ( in older vehicles the starter solenoid was attached to the fender or firewall of the vehicle).
When the ignition switch sends the signal to the starter solenoid, it closes the switch that allows the power from the battery to go to the starter, the current enters the starter, creating a magnetic field inside the starter assbly that causes it to spin, at the same time the starter starts spinning a bendix ( small gear located in the output shaft of the starter) slides out and makes contact with the teeth on the flywheel, and start turning it, as the engine begins to turn
The engine will add the necessary fuel and ignition to the cylinders to start running, when you notice that your vehicle is running, you release the ignition switch and stop the starter from turning any more.
This principle remains the same in all vehicles, but new electronic devices have been introduced to make the ignition system more complex, but it has added safety features.
instead of the starter solenoid receiving the signal directly from the ignition switch, this signal is sent to the engine control computer, the engine control computer sends the signal to a starter relay, the starter relay sends the signal to the starter solenoid.
Also built in the starting system are the anti-theft devices, the ignition lock and key assbly has a sensor that detects if the right key has been inserted in it, if it doesn't match the specified parameter the computer won't allow your car to start, also if someone triggered the car alarm to go off, the engine control computer won't allow the car to start either, There are new services like ON * that allows a person to shut off your car by satellite if you locked your keys inside, or they can unlock your vehicle also, as time goes by, new technology arrives and affects everything in our vehicles, even the simple starting system, ( not so simple anymore)