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Saab Key Programming Saab cars produced since 1994 use an immobilizer that relies on coded keys. A new transponder is required for addition of an additional key, and special programming. This is usually done by the dealer using a special Tech2 diagnostic tool. It can be costly. You should always keep an extra set of keys at hand. Transponder key The transponder is a key equipped with an electronic chip. This chip sends out a signal when the key is put into the ignition. The car will check to see whether the signal is the same as the one on the key. If both signals match it will open itself and start. This is a great way to prevent car theft and keep your car safe from thieves. Transponder keys are a popular feature in vehicles, but you should be aware that they aren't as secure as classic keys made of metal. The metal component of a traditional key can be easily copied and cut, but a transponder has an electronic chip which protects it. The chip is a unique code which is programmed into a car's computers in order 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 won't start when the key isn't programmed to match. It is essential to have an extra Saab key. This is especially true for those who live in a rural area that is home to many car thieves. The good part is that you can obtain a replacement key for your Saab without needing to visit an auto dealer and pay the high costs they ask. You can get an original key made on the spot at a fraction of the price you'd pay at a dealership. saab 9-3 key fob replacement for Wired Saab cars typically come with two keys when they are new. If you only have 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 could be expensive especially if buying a used car. The next step is connecting the wires for columns and rows to your microcontroller. This is the toughest part of the project and will require lots of soldering. There isn't a standard way to accomplish this, but it is essential to determine the way you'll route and solder the columns and rows. For this keyboard, there are 5 rows and 17 columns, so there will be 22 microcontroller wires and pins to connect. Once the rows and columns are soldered, it's time to connect them to key switches. To do this, place a diode across each key switch pin and solder it. This will protect the pins from current and prevent them from being shortened. The diode allows current to only flow in one direction. It has a visual indicator, a black band, that indicates the direction in which current will flow. Sanabria says that some of the tools sold in auto parts stores, such as the Autel MaxiIM IM608PRO or IM508, can help customers who are shopping or DIY customers to program replacement keys and restore the immobilizer's data. The tools plug into OBD ports and guide the user through each step which makes the process much easier than replacing the vehicle's computer. Jumpstarting the battery A lot of people keep a set of jumper cables in their trunks for emergencies, but jumping a battery in newer vehicles might not be the best idea. These vehicles are equipped with numerous electronic devices and computers that communicate with each other. A surge of voltage when batteries are connected to another one could cause damage to the parts, rendering your car undriveable. Start the vehicle you are using and let it run for about two minutes before connecting the cables to the non-working one. 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 car. The engine block is a great option. Do not 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, start the disabled vehicle and let it run for approximately five minutes before you disconnect them in reverse order. The battery in the Saab 9-3 will charge while you drive. It will take some time for it to fall back. It's a good idea purchase a spare fob as soon as you can, because replacing the only working one requires the installation of a new computer module and a special program to convince the system that your lost keys aren't attempting to steal the car. Replacement Case Many Saab owners have only one key for their car and if they lose it, the cost will be. It's expensive to add the key and also requires replacing the CIM or TWICE for older models. In the event of theft or other catastrophe, it is best to have an extra key. Don't buy a secondhand key, even when it's “new.” Claimed-new keys from aftermarket sellers will not be effective and are almost guaranteed to fail in the crucial moment. Most locksmiths cannot help you when you only have one working key, and the dealer will charge top dollar to replace the computer in your vehicle to create a replacement. We can reset and reprogram the EEEPROM of your computer to make it ready to accept a replacement key without replacing the entire system. This can help you save money. It's cheaper to do this than wait until you lose the only key.