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How to Programming a BMW Key Fob It is crucial that mechanics and locksmiths stay current with the latest automotive technology. This includes key duplication and programming. This will allow them to tackle complex issues such as BMW key fob programming. Start by inserting your working key into the ignition and then turning the key to position 1. The dash and accessories lights should turn on. What is an EEPROM? The EEPROM is a non-volatile memory chip that can be erased and reprogrammed. It is used to store a number of things, including the serial numbers and other distinctive information in virtually everything connected to Ethernet and the chip used in charge cards, printers and even blood glucose monitors. It is also used to store data sequences that regulate microcontrollers' operations, as well as to offer a method of recovering from power-on reset situations. The basic EEPROM chip contains two field effect transistors. The floating gate is on one and the control gate is on the other. When the device is turned on, electrons are released and are trapped in a zero state or a 1 state based on the voltage applied. This transistor state can be used to read the EEPROM. When the EEPROM state is “0” and it is “0”, it has no value. When the EEPROM state is “1” it has a value of 1. In between these states, there is no stored data, but it can be written to. The EEPROM can also be erased by applying a certain voltage to the gate for a brief period of time. The EEPROM is advantageous because it can be erased and written to without external circuitry. This makes EEPROMs extremely beneficial for systems which require frequent memory updates for remote microcontrollers for keyless systems. However, there are other memory chip models that provide similar functionality and are better suited for long-term storage and retrieval of large files. Modern flash memory chips, like, are very popular and can be used in computers as well as digital cameras. They are used to store multimedia files for long-term storage and retrieval. However, they're not considered to be EEPROMs, and their core functions differ from those of genuine EEPROMs. EEPROMs are still extensively used, however, due to their versatility and ability to store a limited amount of data in a small space. What is OBDII? In the past, many automobile manufacturers had their own diagnostic systems for diagnosing issues with their vehicles. In 1996, the government demanded that all vehicles have an uniform system for reading diagnostic codes. The new system known as OBD-II utilizes the same diagnostic code and port system for all makes and models that are sold in the US. This means that any mechanic can easily diagnose a problem in your vehicle by plugging it into the tool that is specifically designed for. The OBD-II system can detect a range of faults in the engine and other parts of the vehicle by using the standard diagnostic connector. The information is then stored in the car's computer for further analysis. The system is then able to identify and repair any faults before causing significant damage. Mechanics can then connect to the OBD-II port using a scanner tool, which will display the error codes in all their entirety and indicate the part of the system they came from. Scanners have more computing power than code-readers and can read a wider range of error codes. They also display live data graphs and save data for later analysis. Some tools are able to perform more complex functions, such as changing the ECU and supplying performance-enhancing options. These higher-end tools are typically utilized by skilled automotive technicians and are more expensive than simple code scanners. When you connect a scan tool to an OBD II connector, it will recognize the protocol and communicate with the vehicle by using the correct pins. There are a variety of protocols, but the most common ones are SAE J1850 PWM that is used in Ford and a few GM vehicles ISO 14230-4 (KWP2000) that is used in a variety of European or Asian vehicles, and CAN, which is used in the majority of American-made vehicles. Some scan tools tell you exactly what the code is referring to. Others will simply give you the code, and you'll need to do some internet research to determine what it means. What is CAS unit? The CAS module is an BMW device that manages the antitheft system of the vehicle. The system works by analyzing the coded signal from the key fob, and then verifying it with the CAS module. If the signal is valid, the CAS module transmits an enable signal to the engine control unit. If the signal is invalid, the engine will not start. BMW CAS module malfunctions can result in a variety of symptoms including key fob problems, alarm activation, central locking and dashboard warning lights. If you experience any of these symptoms, make sure you have the CAS Module checked as soon as possible by a professional. The CAS system makes use of the BMW ICOM VCDS to communicate with the engine and other systems in the vehicle. The VCDS connects to the CAS via a cable that is specially designed with an DIN connector at the end. The VCDS can perform a number of functions, like display of error codes, or even changing the timing of the ignition. It also offers a variety of security features to protect the vehicle from theft. In addition to the ICOM VCDS, BMW vehicles are equipped with a CAS component that is integrated into the key. The module is powered by the ignition coil, and is not designed to use batteries. A transponder chip is integrated in the key to send the coded signal to the CAS module. The signal is transmitted via loop antenna (coil) at the lock for ignition. CasSystem implements the logic of CAS state. You must create one instance of this class on each device that requires information from CAS. The creation of multiple instances of this class could result in undesired behavior. CasSystem also manages alert messages in addition to providing state data. It does this by publishing a cas_activate_alert subject that requires event data as an object with key and priority properties. The topic provides the ID and possibly the suffix of the alert that you want to activate, along with the priority level. Once you've activated an alert, the CasSystem will broadcast an alert on the cas_alert_displayed as well as the cas_alert event bus topics (defined by the CasEvents interface). It will also subscribe to the cas_master_warning_active and cas_master_caution_active topics to consume their statuses. How to program the BMW Key BMW offers keyless entry for those living in the Murrieta region. This convenient feature allows you to lock and unlock your vehicle without using the physical key. However the keyless entry feature can only be activated if the key fob is programmed to the vehicle. To do this, you'll have to follow a few steps. This process differs slightly depending on whether you're looking to connect a brand new key fob with your existing BMW or are beginning from scratch and don't have a working key. The first step is to place the working key fob in your vehicle, along with the one you wish to program. Make sure all the windows and doors are closed. Insert the working key into the ignition, and turn it to the first position and quickly returning five times (do not start the engine). Take the key out by turning it backwards. With the key fob still in your pocket, hold down the unlock button as you press the lock button (the BMW logo) three times fast. Then release More Support and the door locks should be locked and unlock automatically. Repeat this procedure for each key fob. The final step is connecting your smart phone to your car via Bluetooth. Log into the BMW Connected application. The BMW Digital Key setup button will be displayed. This will activate the key on your smartphone and allow you to use it with the Digital Wallet app. After you've completed these steps, your BMW key fobs are now able to be used by other members of your Corona family or your family. For drivers who need help, our service department is always available to provide more tips and tricks to ensure a successful BMW experience! It is also possible to replace the battery on the key fob of your BMW. This is a simple task that you can do at home. To change the battery, all you need to do is take off the cover on your key fob and then carefully remove the battery that was in place, and then replace it with a new CR2032. The keys will be back and on the road in just a few minutes.