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Saab Key Programming Saab cars built since about 1994 feature an immobilizer mechanism that is based on codes for keys. In order to add a second key, it requires a new transponder and special programming. This is usually done at the dealer using a special Tech2 diagnostic tool. This can be expensive. This is the reason why you should always keep a spare key in your possession. Transponder key The transponder key comes equipped with an electronic chip. It sends a signal back to the car when it is inserted into the ignition. The car then checks to see whether the signal is the same as the one on the key. If the signals match, the car will unlock and begin. This is an excellent way to guard your car against theft. Transponder keys are a common feature in automobiles, however you should be aware that they're not as secure as classic keys made of metal. While the metal portion of a traditional key may be cut and copied however, a transponder is secured by an electronic chip. The chip has 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 turn on. The car can only recognize the key fob if it has a chip that is unmodified and programmed to match. Otherwise, the car would reject the key and not start. It's important to make sure that you have a spare key for your Saab. This is especially important when you live in a rural area with many car thieves. You can get a new key for your Saab by visiting the dealership without paying expensive prices. You can get an original key made on the spot at a fraction of what you would pay at dealerships. Key for Wired Saab cars typically come with two keys when new. If you have only one, it is a good idea to get an extra key fob as quickly as you can since if you lose it, your car will require an entirely new CIM unit, and the locking cylinders will have to be replaced. This can be costly particularly if you are purchasing a used car. The next step is to connect the column and row wires to the microcontroller. This is the most difficult part of the project and will require a great deal of soldering. There is no standardized way to accomplish this, however it is important to think about how you will route and solder the rows and columns. For this keyboard, there are 5 rows and 17 columns, so there will be 22 microcontroller wires and pins that you need to connect. After the columns and rows are soldered, it's the time to connect them to the key switches. Solder a diode on each key switch pin. This will protect the pins on the key switch from current and prevent them from being shorted. A diode allows current to only flow in one direction. It comes with a visual indicator of a black line that shows which way current will flow. Some of the tools you can find at auto parts stores- such as the Autel MaxiIM IM608 PRO and IM508 — may help shop customers or even DIY customers in certain instances programme replacement keys and recover the lost immobilizer's data, Sanabria says. The tools plug into OBD ports and guide the user through each step making the process simpler than replacing the vehicle's computer. Jump-starting the battery A lot of people keep a set of jumper cables in their trunk to use in an emergency however, jumping a battery on newer vehicles may not be the best choice. These vehicles are equipped with numerous computers and digital devices which communicate with each other. explanation of voltage when batteries are connected to another could cause damage to the components and render your vehicle unusable. Start the vehicle you are using and let it run for about two minutes before you connect the cables to the disabled 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 an unpainted, clean metal surface beneath the damaged car's hood—the engine block is an excellent choice. Do not connect the black cable to the negative terminal of the dead battery, as this could trigger a spark that ignites the gasoline in the engine bay. Once the cables are connected, start the vehicle you are not using and let it run for about five minutes before disconnecting the cables in reverse order. Be aware that the battery of the Saab 9-3 gets recharged when you drive, and it may take some time for the battery to go back to its original level. You should consider purchasing an additional key fob when you can. Replacing the 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 car and if they lose it, they'll be charged. It's expensive to purchase a key and requires replacing the CIM or TWICE in the case of older models. It is recommended to have a second key in case of theft or any other catastrophe, and the best way is to purchase an extra key as early as you can. Even if the key is “new”, it will not function. Most locksmiths cannot help you when you only have one working key and the dealer will charge high fees to replace the computer in your vehicle to make a new replacement. We can reset and reprogram the computer's EEEPROM to make it ready to accept a replacement key without replacing the entire system. This can help you save a significant amount of money. It's less expensive rather than wait until you loose the only key.