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Saab Key Programming Saab cars built since about 1994 feature an immobilizer mechanism made up of coded keys. The addition of a key requires a new transponder and special programming. This is usually done by the dealer using a Tech2 diagnostic tool. The problem is that this can be extremely expensive. It is recommended to always have an extra set of keys available. Transponder key The transponder is a key that is equipped with an electronic chip. The chip transmits a signal when the key is inserted in the ignition. The car will check to see whether the signal matches the one on the key. If the signals match the car will then unlock and begin. This is a great method to safeguard your car from theft. Transponder keys may be an extremely popular accessory for cars, but they are not as secure as traditional metal keys. While the metal parts of a traditional key may be cut and copied, a transponder is protected by an electronic chip. This chip contains an unique code that is encoded into the car's system to identify it. The car will recognize the Saab keyfob and allow it to be turned on. The car will only recognize the key fob when it has an unmodified chip and has been programmed to match. The car will not start in the event that the key is not programmed to match. It's important to make sure that you have an extra key for your Saab. This is especially true when you live in a rural area that is home to many car thieves. You can get a brand new key for your Saab by going to the dealership, without having to pay their pricey prices. In most cases, you can have an original key made on the spot at a fraction of the price of what you would pay at the dealer. Key for Wired Saab cars typically come with two keys upon purchase. If you have only one, it is an ideal idea to purchase an extra key fob as soon as possible in case you lose it the car will require an entirely new CIM unit and the locking cylinders need to be replaced. This can be costly especially for cars that are used. The next step is to connect the wires of the column and row to the microcontroller. This is the most laborious part of the project, and it will require lots of soldering. It's not a common way to go about it, but you should consider how you will route and solder each column and row. There are 22 microcontroller pins and wires to connect for this keyboard. It includes 5 rows and 17 column. Once the rows and columns are soldered, it's the time to connect them to the key switches. Solder a diode to each key switch pin. This will protect the key switch pins from current and stop them from being shorted. The diode allows current to only flow in one direction. It is equipped with a visible indicator of a black line that indicates the direction in which current will flow. Some of the tools available at auto parts stores -like the Autel MaxiIM IM608 Pro and IM508 — can help shop customers or even DIY customers in certain cases programme replacement keys and recover lost immobilizer data, Sanabria says. The tools plug into the OBD port and automatically guide the customer through the procedure, making it much easier than replacing the computer in the vehicle. Jump-starting the battery Most people keep a set of jumper cables in their trunks in case of emergency, but jumping a battery in newer vehicles may not be the best idea. These vehicles are equipped with numerous digital and computers that communicate with one another. A voltage surge when a battery is connected to another could cause damage to the components and render your vehicle unusable. Start the vehicle you are using and allow it to run for around two minutes before connecting the cables to the battery that is not working. Attach the red clip to the positive terminal of the battery that is good (it will have “POS” or “+” on it). Attach the other end of the black cable to a clean, unpainted metal surface underneath the disabled car's hood—the engine block is a good choice. The black cable should not be connected to the negative terminal of the dead battery. This could create sparks that could ignite the gasoline inside the engine compartment. Once the cables are connected, start the car and let it run about five minutes. Then disconnect the cables in reverse. Keep in mind that the battery on the Saab 9-3 will be charged when you drive, so it may take some time for the battery to come back to normal. You should purchase another key fob as soon as possible. The replacement of the one that works requires the installation and programming of a new computer chip. Replacement case Many Saab owners have only one key for their vehicle and if they lose that key, it will cost them. The reason is that it's not cheap to replace a key, and it requires replacing the CIM (Column Integration Module) or TWICE on older models, and programming. In the event of theft or any other catastrophe it is best to have a spare key. Even it's “new” it will not function. The dealer will charge you the most expensive dollars if you only have one working key. We can, however, reset and re-program the computer's EEPROM in order to prepare it to accept the new key without having to replace the entire system. This can save you a lot of money. saab 9 3 key replacement 's also much less expensive than waiting until you lose the only key.