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Saab Key Programming Saab cars that were built prior to 1994 have an immobilizer system that is based on codes for keys. In order to add a second key, it requires the purchase of a new transponder as well as special programming. This is usually done by the dealer using a special Tech2 diagnostic tool. This can be expensive. It is always advisable to keep a spare set of keys available. Transponder key The transponder can be described as a key that has an electronic chip. This chip sends a signal when the key is put into the ignition. The car then examines the signal to see whether it is the same as the one on the key. If the signals are the same it will open itself and start. This is an excellent way to guard your car against theft. Transponder keys are a common feature in automobiles, however you should be aware they aren't as secure 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 is a unique code that's programmed into a car's computer order to identify it. The car will recognize the Saab keyfob and permit it to be turned on. However, it will only do this if your key fob is unmodified and has a chip that has been programmed to match the original. The car won't start in the event that the key has not been programmed to match. It is essential to ensure that you have an extra key for your Saab. This is particularly important for those who live in a rural area, where there are numerous 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 hefty prices they ask. You can get the replacement key on the spot at a fraction of the price you'd spend at an auto dealer. Key for Wired Saab cars typically come with two keys upon purchase. If you only have one, it's best to acquire an extra key fob as soon as you can as if you lose it the car will require an entirely new CIM unit, and the locking cylinders have to be replaced. This could be expensive especially if you're buying a second-hand car. The next step is to connect the wires for columns and rows to your microcontroller. This is the most challenging part of the project and will require a large amount of soldering. There isn't a standard method to go about it, however, you should plan how to connect and solder each column and row. There are 22 microcontroller wires as well as pins to connect for this keyboard. It has five rows and 17 columns. After the columns and rows are soldered, it's the time to connect them to the key switches. To do this, put an inverter over each pin of the key switch and then solder it. saab key fob G28CarKeys will shield the pins that are used for key switches from current and stop them from being shorted. A diode allows current to only flow in only one direction. It comes with a visual indicator that is black, that indicates the direction in which current will flow. Sanabria says that a few of the tools offered in auto parts stores, including the Autel MaxiIM IMM608PRO and IM508 are able to assist customers 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, making the process easier than replacing the car's computer. Jump-starting the battery Most people keep a set of jumper cables in their trunks to use in an emergency, but jumping a battery in newer vehicles may not be the best choice. These cars are equipped with a variety of digital and computers that communicate with one another. A voltage spike when the battery is connected another one could cause damage to the parts making your car inoperable. Connect the cables to the vehicle working. Let it run for two minutes. Attach the red clip on the positive terminal of the battery that is good. (It will read “POS” or “+”.) Attach the other end to a clean unpainted metal surface underneath the hood of the affected 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 trigger an ignition source that ignites gasoline in the engine bay. Once the cables are connected, turn on the vehicle you are not using and let it run for approximately five minutes before you disconnect the cables in reverse order. The battery in your Saab 9-3 will recharge while you drive. It will take some time for it to return to its original state. You should consider purchasing a second 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 it, key, it will cost them. It's costly 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 a spare key. However, don't purchase a secondhand key, even the case that it's “new.” Claimed-new keys from sellers selling aftermarket keys won't perform and are almost certain to fail at the critical moment. The majority of locksmiths won't be able to help if you have only one working key, and the dealer will charge you high prices to replace the computer in your vehicle to make a replacement. We can, however, reset and reprogram the computer's EEPROM to accept a new key without replacing the entire system. This could save you a lot of money. It's cheaper to do this than wait until you loose the only key.