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Saab Key Programming Saab cars that were built prior to 1994 have an immobilizer feature made up of coded keys. In order to add a second key, it requires a new transponder and special programming. This is usually done by the dealer using a Tech2 diagnostic tool. It can be costly. This is why you should always keep a spare key in your possession. Transponder key The transponder is a piece of key that is equipped with an electronic chip. The chip sends a signal when the key is inserted into the ignition. The car will then check the signal to determine whether it is the same as the one that is in the key. If the signals are identical the car will then unlock itself and start. This is an excellent way to protect your vehicle from theft. Transponder keys are a popular feature in vehicles, but you should be aware they aren't as secure as traditional keys made of metal. The metal portion of a traditional keys can be easily cut and copied, however a transponder has an electronic chip which protects it. The chip contains a unique code that is programmed into a car's computer in order to identify it. The car will recognize the Saab keyfob and permit it to turn on. The car will only recognize the key fob when it has a chip that is unmodified and has been programmed to match. The car will not start in the event that the key has not been programmed to match. It's crucial to ensure that you have an extra key for your Saab. This is especially important if you live in a rural location where there are many car thieves. The good news is that you can find a replacement key to your Saab without needing to visit a dealership and pay the high prices that they demand. In the majority of instances, you can get a new key made on-the-spot for less than half the cost of what you would pay at dealerships. Key for Wired Saab cars typically come with two keys when they are new. If you only have one, it is a good idea to get an additional key fob as soon as possible, because if you lose it, your car will require the replacement of a CIM unit and the locking cylinders will need to be replaced. This can be expensive particularly for used cars. The next step is to connect the wires for columns and rows to your microcontroller. This is the most tedious aspect of the project and it will require a lot of soldering. It's not a common way to go about it, but you should plan how to connect and solder each column and row. For this keyboard, there are five rows and 17 columns. This means there will be 22 microcontroller wires and pins to connect. After the columns and rows are soldered together It is now time to connect the key switches. To do this, place an inverter over each pin on the key switch and solder it. This will protect the pins on the key switch from current and prevent them from being shorted. The diode allows current to only flow in only one direction. It features a visual indicator that is black, that shows which way current will flow. Sanabria states that some of the tools available in auto parts stores, such as the Autel MaxiIM IMM608PRO and IM508 can assist 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 making the process simpler than replacing the car'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 in newer vehicles may not be the best option. These vehicles have many digital and computer systems that communicate with one another. A voltage spike when the battery is connected to another could cause damage to the components making your car inoperable. Connect the cables to the vehicle operating. Let it run for two minutes. Attach the red clip to the positive terminal of the good battery. (It will say “POS” or “+”.) Attach the other end to a clean and unpainted metal surface under the hood of the affected vehicle. The engine block is an excellent option. Don't connect the black cable to the negative terminal of the dead battery because it could ignite an ignition spark that ignites the gasoline in the engine bay. After the cables have been connected, start the car and allow it to run for around five minutes. Then, disconnect the cables in reverse. Be aware that the battery of your Saab 9-3 is charged when you drive, so it will take a while for the battery to go back down again. It's a good idea to buy a spare key fob as soon as you can, because replacing the sole working one requires the installation of a brand new computer module and a special program to convince the system that your lost keys aren't in the process of trying to steal the car. Replacement Case Saab owners typically only have one car key, and if that is lost, they will be charged. More inspiring ideas to buy an additional key and it requires replacing the CIM or TWICE in the case of older models. In the event of theft, or any other calamity it is advisable to have an extra key. Don't buy a secondhand key even if it's “new.” Keys that are claimed to be new from a second-hand store will not perform and are almost certain to fail in the most critical moment. The majority of locksmiths won't be able to help in the event that you only have one working key and the dealer will charge high prices to replace the computer in your vehicle to make a replacement. We can, however, reset and reprogram the computer's EEPROM in order to prepare it to accept an alternative key without replacing the whole system. This can save you a significant amount of money. It's also cheaper than waiting until you lose the only key.