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lost saab keys built since about 1994 feature an immobilizer mechanism based on coded keys. A new transponder is required for the addition of an additional key, as well as special programming. This is usually handled by the dealer using the Tech2 diagnostic tool. It can be costly. It is recommended to always have a spare set of keys in your possession. Transponder key The transponder key is a key with an electronic chip that transmits a signal to the car when it is inserted into the ignition. The car then examines the signal to see whether it is the same as the one that is in the key. If both signals match it will open itself and start. This is a great way to avoid car theft and keep your car safe from thieves. Transponder keys are a common feature in vehicles, but you should be aware they are not as secure as classic keys made of metal. While the metal parts of a traditional key can be cut and copied however, a transponder is secured by an electronic chip. This chip has a unique code programmed into the car's computer to identify it. When a Saab key fob is used the car recognizes it and allows it to turn on. The car will only recognize the key fob if it has an unmodified chip and programmed to match. The car won't start when the key isn't programmed to match. It is essential to have an extra Saab key. This is especially true when you live in a rural area that is home to numerous car thieves. The good part is that you can find a replacement key to your Saab without having to go to an auto dealer and pay the high costs that they demand. In most instances, you can get an original key made on the spot for less than half the cost of what you'd pay at a dealer. Key for Wired Saab cars typically come with two keys when they're new. If you have only one, it's a good idea to get an additional key fob as soon as is possible since if you lose it, your car will require a new CIM unit and the locking cylinders have to be replaced. This can be expensive, especially for used cars. The next step is connecting the wires of columns and row to your microcontroller. This is the most difficult aspect of the project and it will require lots of soldering. It's not a common way to go about it, but you must think about how to route and solder each column and row. There are 22 microcontroller wires and pins that you can connect for this keyboard. It has 5 rows and 17 column. After the rows and column are joined then it's time to connect the key switches. Solder a diode to each key switch pin. This will protect the pins that are used for key switches from current and keep them from being shorted. A diode allows current to only flow in one direction. It features a visual indicator that is black, that shows the direction in which the current will flow. Some of the tools you can find at auto parts storeslike the Autel MaxiIM IM608 Pro and IM508 — can aid shop customers or DIY users in some cases create replacement keys and restore the lost immobilizer's data, Sanabria says. The tools connect to OBD ports and guide the customer through each step making the process simpler than replacing the vehicle's computer. Jump starting the battery A majority of people keep an item in their trunks to jump start a vehicle in an emergency, but this might not be the best idea for cars with more modern technology. These cars are equipped with a variety of digital and computer systems that communicate with one another. A voltage spike when the battery is connected to another one could damage these components, rendering your car unable to drive. Start the vehicle you are using and allow it to run for approximately two minutes before you connect the cables to the disabled one. Attach the red clip on the positive terminal of the good battery. (It will say “POS” or “+”.) Attach the other end to a clean, unpainted metal surface underneath the hood of the damaged vehicle. The engine block is a great choice. The black cable is not to be connected to the negative terminal of the dead battery. This could trigger sparks, which could ignite the gasoline in the engine compartment. Once the cables are connected, turn on the vehicle that is disabled and let it run for approximately five minutes before you disconnect them in reverse order. Be aware that the battery in your Saab 9-3 is charged when you drive, so it will take a while for the battery to go back down again. It is a good idea to buy a spare key fob as soon as you can, because replacing the sole working one requires the installation of a new computer module and a special program to convince it that your missing keys aren't trying to steal the car. Replacement case Many Saab owners have only one key for their car and if they lose that key, it will cost them. The reason for this is that it's costly to replace a key, and it involves replacing the CIM (Column Integration Module) or TWICE on older models, and programming. In the event of theft or other catastrophe, it is best to have an extra key. Even it's “new” it will not function. Most locksmiths cannot help you if you have only one working key, and the dealer will charge for the cost of replacing the computer in your car to make a replacement. We can reset and reprogram the computer's EEEPROM to get it ready to accept a replacement key without having to replace the entire system. That can save you a significant amount of money. It's also less expensive than waiting until you lose your sole key.