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Saab Key Programming Saab cars that were built prior to 1994 have an immobilizer feature based on coded keys. A new transponder is required for the addition of an extra key, as well as special programming. This is usually done at the dealer, using a specially-designed Tech2 diagnostic tool. The problem is that it can be very costly. It is recommended to always have an extra set of keys at hand. Transponder key The transponder key is a piece of hardware with an electronic chip that sends a signal back to the car when it is put into the ignition. The car will then check the signal to determine whether it matches the one that is in the key. If the signals match it will unlock and begin. This is a great method to safeguard your car from theft. Transponder keys may be an increasingly popular feature for automobiles, but they are not as safe as traditional keys made of metal. The metal part of the traditional key can be easily cut and copied, however the transponder is protected by an electronic chip that protects it. The chip contains a unique code that 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. However, it can only do this if your key fob is unmodified and has a chip that has been programmed to match it. If not, the car will reject the key and refuse to start. It is essential to have an extra Saab key. This is particularly important especially if you reside in a rural area where there are a lot of car thieves. You can purchase a new key for your Saab by going to the dealership without paying their high prices. In the majority of cases, you can have a new key made on-the-spot at a fraction of the price of what you'd pay at a dealer. Wired key Saab cars are usually delivered with two keys. If you only have one, it is an ideal idea to purchase an additional key fob as soon as possible, because if you lose it the car will require the replacement of a CIM unit, and the locking cylinders have to be replaced. This can be costly especially if you're buying a used car. The next step is to connect the row and columns wires to your microcontroller. This is the most challenging part of the project and will require a great amount of soldering. There is no standard method to accomplish this, however it is essential to determine the route you'll take and solder the columns and rows. For this keyboard, there are five rows and 17 columns, so there will be 22 microcontroller wires and pins to connect. Once the rows and columns are soldered, it's the time to connect them to key switches. Solder a diode to each key switch pin. This will shield the pins from current, thus preventing them from being shortened. A diode lets current only flow in one direction. It has a visual indicator of a black line 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 can assist shoppers or DIY customers to program replacement keys and restore immobilizer data. The tools connect to OBD ports and help the customer through each step making the process simpler than replacing the vehicle's computer. Jumpstarting the battery Most people keep a set in their trunks to jump-start a vehicle in an emergency, but this might not be the best idea for vehicles that are newer. These vehicles are equipped with computers and digital devices which communicate with one another. A voltage surge when a battery is connected to another one could cause damage to the parts, rendering your car undriveable. Connect the cables to the vehicle that is operating. Allow it to run for two minutes. Attach the red clip on 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 underneath the car's hood—the engine block is a good choice. The black cable is not to be connected to the negative terminal of the dead battery. This could result in sparks that could ignite the gasoline that is in the engine compartment. Once the cables are connected, you can start the vehicle you are not using and let it run for about five minutes before you disconnect the cables in reverse order. The battery in the Saab 9-3 will charge as you drive. It will take a while for it to drop back down. It is a good idea to buy a spare key fob as soon as you can, since replacing the one that works requires the installation of a brand new computer module and a special program to convince it that your lost keys aren't attempting to steal the car. Replacement Case Many Saab owners only have one key for their car and if they lose it, they'll be charged. saab key programming to add keys and will require replacing the CIM or TWICE for older models. In the event of theft or other catastrophe it is advisable to have a spare key. Don't purchase a used key, even if it's “new.” Claimed-new keys purchased from third-party sellers won't work and are likely to fail in the most critical moment. Most locksmiths can't help you when you only have one working key and the dealer will charge top dollar to replace the computer in your car to make a new replacement. However, we can reset and re-program your computer's EEPROM to accept a new key without replacing the entire system. This could save you a lot of money. It's also cheaper than waiting until you lose your one key.