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Saab Key Programming Saab cars built since about 1994 have an immobilizer feature that is based on codes for keys. A new transponder is required for inclusion of an additional key, and special programming. This is usually done by the dealer using a Tech2 diagnostic tool. This can be expensive. It is recommended to always have a spare set of keys on hand. Transponder key The transponder can be described as a key equipped with an electronic chip. The chip transmits 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 then the car will be able to unlock and start. This is a great method to avoid auto theft and keep your vehicle secure from thieves. Transponder keys are a common feature in automobiles, however you should be aware they are not as secure as traditional metal keys. While the metal component of a traditional key could be cut and copied the transponder is protected by an electronic chip. The chip contains a unique code which is programmed into the car's computer in order to identify it. The car will recognize the Saab keyfob and permit it to be turned on. However, it can only do this if the key fob is equipped with a chip that is not modified that has been programmed to match it. Otherwise, the car will reject the key and won't start. It is important to have an extra Saab key. This is especially important if you reside in a rural area that is home to numerous car thieves. You can get a brand new key for your Saab by visiting the dealership and not paying their pricey costs. In most cases, you can have an original key made on the spot for less than half the cost of what you would pay at dealerships. Key for Wired Saab cars usually come with two keys upon purchase. If you only own one, you should purchase an additional key as soon as you can. This is because if the key is lost, the car will need an entirely new CIM and the locking cylinders replaced. This can be costly particularly if you are purchasing a used vehicle. The next step is connecting the wires for columns and rows to your microcontroller. This is the most challenging part of the project and will require a good amount of soldering. There is no standard method to accomplish this, but it is crucial to plan the route you'll take and solder the columns and rows. There are 22 microcontroller pins and wires to connect for this keyboard. It has 5 rows and 17 column. After the columns and rows are soldered together It is now time to connect the key switches. To do this, put a diode across each pin of the key switch and solder it. This will shield the pins from current, thus preventing them from being shortened. A diode allows the flow of current to be in one direction, and it also has a a black band visual indicator that indicates the direction in which current will flow. Some of the tools offered at auto parts stores- such as the Autel MaxiIM IM608 Pro and IM508 — may help customers in the shop, or even DIY users in some cases create replacement keys and restore lost immobilizer data, Sanabria says. The tools plug into OBD ports and guide the customer through each step, making the process easier than replacing the car's computer. Jump-starting the battery A lot of people keep a set in their trunks to jump start a car in an emergency, but it may not be a good idea for cars with more modern technology. These vehicles have many digital and computer systems that communicate with one another. A surge in voltage while the battery is connected to another could cause damage to these components, rendering your car unable to drive. Start the vehicle that is working and let it run for about two minutes before you connect the cables to the non-working one. Attach the red clip to the positive terminal of the battery that's good. (It will say “POS” or “+”.) Attach the other end of the black cable to a clean, unpainted metal surface underneath the disabled car's hood. The engine block would be an ideal choice. Don't connect the black cable to the negative terminal of the dead battery as it could ignite a spark that ignites the gasoline in the engine bay. After G28 Car Keys have been connected, start the vehicle and let it run for about five minutes. Then disconnect the cables in reverse. The battery in your Saab 9-3 will recharge while you drive. It will take some time for it to fall back. It's a good idea to buy a spare key fob as soon as you can, since replacing the sole working one requires the installation of a new computer module and special programming to convince it that your lost keys aren't in the process of trying to steal the car. Replacement Case Many Saab owners have only one key for their car and if they lose it, they'll be charged. It's expensive to purchase a key and requires replacing the CIM or TWICE for older models. It is best to have a spare key in the event of theft or other disaster and the best option is to purchase an additional key as soon as you can. Even if the key is “new”, it will not work. The dealer will charge the highest dollars if you only have one working key. We can, however, reset and re-program your computer's EEPROM to accept the new key, without replacing the entire system. This could save you a great deal of money. It's more affordable rather than wait until you loose the only key.