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Saab Key Programming Saab cars made from 1994 have an immobilizer system based on a set of keys. In order to add a second key, it requires an entirely new transponder and programming. This is usually handled by the dealer using the Tech2 diagnostic tool. It can be costly. This is the reason why you should always have a spare key at 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 inserted in the ignition. The car is able to check if the signal matches the one on the key. If the signals are in sync, the car will open and start. This is a great method to guard your car against theft. Transponder keys are an extremely popular accessory for automobiles, but they are not as safe as traditional keys made of metal. The metal component of a traditional key can be easily cut and copied, however transponders are protected by an electronic chip which protects it. The chip has a unique code programmed into the car's computer to identify it. The car will recognize the Saab keyfob, and allow it to be turned on. The car will only recognize the key fob if the device has an unmodified chip and programmed to match. The car won't start if the key is not programmed to match. It's essential to ensure that you have a spare key for your Saab. This is particularly important when you live in a rural area, where there are a lot of car thieves. The good news is that it's possible to obtain a replacement key for your Saab without having to go to a dealership and pay the expensive prices that they ask. You can have an original key made on the spot for less than half of what you would spend at an auto dealer. Wired key Saab cars are usually delivered with two keys. If you only have one, it's a good idea to get an additional key fob as soon as is possible in case you lose it the car will require a new CIM unit, and the locking cylinders have to be replaced. This can be costly especially for cars that are used. The next step is to connect the wires for columns and rows to your microcontroller. This is the most tedious component of the project and will require a lot of soldering. There is no standardized way to do this, but it is important to think about the routes you'll use to solder the rows and columns. For this keyboard, there are 5 rows and 17 columns. This means there will be 22 microcontroller wires and pins that you need to connect. After the columns and rows are soldered together then it's time to connect the key switches. To do this you must place an inverter over each pin of the key switch and then solder it. This will shield the pins from current and prevent them from being shortened. A diode only allows the current to flow in a single direction, and it has a black band visual indicator that indicates the direction in which current will flow. Some of the tools you can find at auto parts stores -like the Autel MaxiIM IM608 Pro and IM508 — could help shop customers or even DIY users in some cases programme replacement keys and recover lost immobilizer information, Sanabria says. The tools plug into the OBD port and automatically guide the user through the process, making it easier than replacing the computer inside the vehicle. Jump-starting the battery The majority of people have a set of jumper cables in their trunks for emergency situations however, jumping a battery for newer vehicles may not be the best idea. These vehicles are equipped with many electronic devices and computers that communicate with each other. A surge in voltage when a battery is hooked up to another could cause damage to the components and render your car unable to drive. Connect the cables to the vehicle that is operating. Let it run for two minutes. Attach the red clip to the positive terminal of the good battery (it will have “POS” or “+” on it). Attach the other end of the black cable to an unpainted, clean metal surface underneath the disabled car's hood. The engine block is an ideal choice. The black cable should not be connected to the negative terminal of the dead battery. This could cause sparks, which could ignite the gasoline in the engine compartment. Once the cables are connected, start the vehicle and allow it to run for around five minutes. Then, disconnect them in reverse. Be aware that the battery in the Saab 9-3 will be charged while you drive, so it may take some time to get the battery back down again. It's a good idea to purchase a spare 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 the system that your lost keys aren't trying to steal the car. Replacement Case Many Saab owners only have one key for their vehicle and if they lose it, the cost will be. The reason for this is that it's not cheap to purchase a new key, and that involves replacing the CIM (Column Integration Module) or TWICE on older models, and programming. It's recommended to have a backup key in case of theft or any other catastrophe and the most effective way is to purchase an extra key as early as you can. Even if the key is “new” it will not work. The dealer will charge the highest dollar if you have only one working key. We can reset and reprogram the computer's EEEPROM to get it ready to accept a replacement key without replacing the entire system. G28 could save you a significant amount of money. It's more affordable than waiting until you lose the only key.