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saab 9-3 key fob programming manufactured since 1994 have an immobilizer system based on coded keys. Adding an extra key requires an entirely new transponder and programming. This is usually done at the dealer using a Tech2 diagnostic tool. The problem is that this can be very expensive. This is why it is important to always have a spare key on hand. Transponder key The transponder is a key with an electronic chip. This chip sends a signal when the key is placed into the ignition. The car is able to check whether the signal matches with the one on the key. If the signals are in sync the car will then open and start. This is a great way to deter car theft and keep your vehicle safe from thieves. Transponder keys are an increasingly popular feature in cars, but it is important to know that they are not as secure as classic metal keys. The metal component of the traditional key can be easily cut and copied, whereas the transponder is protected by an electronic chip that safeguards it. This chip has an unique code that is programmed into the car's computers to identify it. When a Saab key fob is used, the car recognizes it and allows it to turn on. However, it is only able to do this if your key fob is equipped with a chip that is not modified that has been programmed to match. Otherwise, the car would reject the key and refuse to start. It's essential to ensure that you have a spare key for your Saab. This is especially important if you live in a rural location where there are many car thieves. You can purchase a new key for your Saab by going to the dealership, without having to pay their high prices. In most cases, you can have a brand new key made right on the spot at a fraction of the cost you would pay at an auto dealer. Key for Wired Saab cars are usually supplied with two keys. If you have only one, you need to purchase an additional key as fast as you can. This is because if you lose it and the car needs an entirely new CIM and the locking cylinders replaced. This can be costly, especially for used cars. The next step is to connect the wires for columns and rows to your microcontroller. This is the most difficult component of the project and will require lots of soldering. There's no standard way to do it, but you should think about how to connect and solder each column and row. There are 22 microcontroller wires as well as pins to connect to this keyboard. It has 5 rows and 17 columns. After the rows and column are joined It is now time to connect the key switches. Solder a diode on each key switch pin. This will shield the pins on the key switch from current and keep them from being shorted. The diode will only allow current to flow in one direction, and it has the black band as a visual indicator that indicates the direction current will flow. Some of the tools available at auto parts storeslike the Autel MaxiIM IM608 Pro and IM508 — can help customers in the shop, 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 process, making it easier than replacing the computer inside the vehicle. Jump-starting the battery A lot of people keep an item in their trunks to jump-start a car in an emergency, however it might not be the best option for vehicles with newer technology. These cars have a variety of electronic devices and computers that communicate with one another. A voltage surge while the battery is connected to another one could damage these components, rendering your vehicle unable to drive. Connect the cables to the vehicle working. Allow it to run for two minutes. Attach the red clip to the positive terminal on the good battery (it will have “POS” or “+” on it). Attach the other end to a clean unpainted metal surface beneath the hood of the disabled vehicle. The engine block is a good option. Do not connect the black cable to the negative terminal on the dead battery, since this could trigger an ignition source that ignites gasoline in the engine bay. Once the cables are connected, start the vehicle you are not using and let it run for about five minutes before you disconnect the cables in reverse order. Be aware that the battery of the Saab 9-3 will be charged during your drive, which means it may take some time for the battery to come back to normal. It is a good idea to buy a spare key fob as soon as you can, since replacing the only working one requires the installation of a brand new computer module and a special program to convince it that your missing keys aren't trying to steal the car. Replacement Case Saab owners usually only have one car key, and if it is lost, they will be charged. It's expensive to buy an additional key and it requires replacing the CIM or TWICE in the case of older models. It's best to have a backup key in the event of theft or other disaster, and the best way is to purchase a second key as early as you can. But don't buy a used key, even when it's “new.” Claimed-new keys from sellers selling aftermarket keys won't be effective and are almost guaranteed to fail in the crucial moment. The dealer will charge you the most expensive dollar for only one working key. However, we can reset and reprogram the computer's EEPROM in order to prepare it to accept an alternative key without replacing the whole system. This could save you a lot of money. It's much cheaper than wait until you lose the sole key.