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Saab Key Programming Saab cars made since 1994 have an immobilizer feature built on coded keys. The addition of a key requires a new transponder and special programming. This is usually handled by the dealer using a 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 to car when it is inserted into ignition. The car then analyzes the signal to determine whether it is identical to the one in the key. If both signals match, the car will unlock itself and begin. This is a great way to protect your vehicle from theft. Transponder keys may be an increasingly popular feature for cars, but they're not as safe as traditional keys made of metal. While the metal part of a conventional key can be cut and copied but a transponder key is protected by an electronic chip. The chip has a unique code programmed into the car's computer to identify it. The car will recognize the Saab keyfob, and allow it to turn on. But, it's only able to do this if your key fob is unmodified and has a chip that has been programmed to match. The car will not start if the key is not programmed to match. It's essential to ensure that you have a spare key for your Saab. This is especially true when you live in a rural location that has many car thieves. You can get a new key for your Saab by visiting the dealership without paying their pricey cost. In most cases, you can have an original key made on the spot for less than half the price of what you'd pay at the dealer. Wired key Saab cars usually come with two keys upon purchase. If you only have one, it's recommended to purchase an extra key fob as soon as possible since if you lose it, the car will require a new CIM unit and the locking cylinders will have to be replaced. This can be costly particularly for used cars. The next step is to connect the wires for columns and rows to your microcontroller. This is the most difficult part of the project and will require a great deal of soldering. It's not a standard way to do it, but you should plan how to connect and solder each column and row. There are 22 microcontroller pins and wires to connect for this keyboard. It includes 5 rows and 17 columns. Once the rows and columns are soldered, it's time to connect them to the key switches. To do this you must place a diode over each pin of the key switch and solder it. This will shield the pins of the key switch from current and keep them from being shorted. A diode allows current to only flow in only one direction. It features a visual indicator that is black, that indicates the direction in which current will flow. Sanabria says that some of the tools offered in auto parts stores, like the Autel MaxiIM IM608PRO and IM508 are able to assist customers who are shopping or DIY customers to program replacement keys and restore data from the immobilizer. The tools connect to 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 A lot of people keep an assortment of tools in their trunk to start a vehicle in an emergency, but this might not be a good idea for newer cars. These vehicles are equipped with numerous digital and computers that communicate with each other. A surge in voltage when a battery is hooked up to another battery could fry these components and leave your vehicle undriveable. Start the working vehicle and allow it to run for around two minutes before you connect the cables to the disabled one. 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 to a clean and unpainted metal surface underneath the hood of the damaged vehicle. The engine block is an excellent option. Don't connect the black cable to the negative terminal of the dead battery, since this could cause an ignition spark that ignites the gasoline in the engine bay. Once the cables are connected, you should begin the car and let it run for about five minutes. Then, disconnect the cables in reverse. Keep in mind that the battery on your Saab 9-3 is recharged while you drive, so it could take a while to get the battery down. It is recommended to purchase an additional 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 the cost will be. It's expensive to purchase keys and will require replacing the CIM or TWICE for older models. It is recommended to have a backup key in case of theft or any other catastrophe, and the best way is to purchase an additional key as quickly as you can. Even even if the key is “new”, it won't work. The dealer will charge you the highest dollar for only one working key. However, we can reset and reprogram the computer's EEPROM to accept the new key, without replacing the entire system. This could save you a lot of money. saab 9-3 key replacement TheKeyLab 's much cheaper instead of waiting until you lose the only key.