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Saab Key Programming Saab cars manufactured since 1994 come with an immobilizer system that is based on codes for keys. A new transponder is required for the inclusion of an additional key, and special programming. This is usually handled by the dealer using the Tech2 diagnostic tool. This can be expensive. This is why it is important to always have a spare key at hand. Transponder key The transponder key comes equipped with an electronic chip. It sends a signal back to the car when it is put into the ignition. The car is able to check whether the signal matches with the one on the key. If the signals match it will open and start. This is a great way to safeguard your car from theft. Transponder keys are a common feature in automobiles, however you must be aware that they are not as secure as traditional metal keys. The metal component of a traditional key is easily copied and cut, but transponders have an electronic chip that protects it. The chip contains a unique code which is programmed into a car's computer order to identify it. When a Saab key fob is used the car recognizes it and allows it to turn on. The car can only recognize the key fob if the device has an unmodified chip and programmed to match. In G28 of that, the car will reject the key and not start. It is essential to ensure that you have an extra key for your Saab. This is particularly important when you live in a rural region where there are a lot of car thieves. You can obtain a replacement key for your Saab by going to the dealership without paying pricey cost. You can get a replacement key made on the spot for less than half the price you'd pay at a dealership. Wired key Saab cars typically come with two keys when they're new. If you have only one, it's best to acquire an extra key fob as quickly as you can in case you lose it, the car will require an entirely new CIM unit and the locking cylinders have to be replaced. This can be expensive particularly for used cars. The next step is to connect the wires for columns and rows to your microcontroller. This is the toughest aspect of the project and will require a lot of soldering. There is no standardized way to accomplish this, however it's important to plan out how you will route and solder the columns and rows. There are 22 microcontroller pins and wires to connect to this keyboard. It includes 5 rows and 17 columns. After the columns and rows are soldered, it's the time to connect them to the key switches. Solder a diode to each key switch pin. This will shield the pins on the key switch from current and also prevent them from being shorted. A diode permits current to only flow in only one direction. It has a visual indicator, a black band, that shows the direction in which the current will flow. Some of the tools offered at auto parts stores -like the Autel MaxiIM IM608 Pro and IM508 — can assist customers at the shop or DIY customers in certain instances replace keys in the program and restore lost immobilizer data Sanabria says. The tools connect to OBD ports and guide the customer through each step which makes the process much easier than replacing the vehicle's computer. Jump-starting the battery The majority of people have an assortment of tools in their trunk to start a car in case of emergency, but this might not be a good option for vehicles with newer technology. They have numerous digital and electronic devices that communicate with one another. A surge of voltage when the battery is connected to another one could cause damage to the parts and render your vehicle unusable. Connect the cables to the vehicle that is working. Let it run for two minutes. Attach the red clip to the positive terminal of the good battery (it will have “POS” or “+” on it). Attach the other end of the black cable to an unpainted, clean metal surface underneath the car's hood. The engine block would be an excellent choice. The black cable is not to be connected to the negative terminal of the dead battery. This could trigger sparks that could ignite the gasoline in the engine compartment. Once the cables are connected the vehicle you are not using and let it run for approximately five minutes before disconnecting the cables in reverse order. The battery in the Saab 9-3 will charge as you drive. It will take a while for it to drop back down. You should purchase a second key fob, as soon as you can. Replacing the original one that works requires the installation and programming of a brand 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. It's expensive to buy the key and also requires replacing the CIM or TWICE in the case of older models. It is best to have a backup key in case of theft or any other catastrophe, and the best way is to purchase an extra key as quickly as you can. Even when the key is “new” it won't work. The dealer will charge you the most expensive dollar if you have only one working key. We can, however, reset and re-program your computer's EEPROM to accept an alternative key without replacing the entire system. That can save you a significant amount of money. It's also less expensive than waiting until you lose the only key.