How to Programming a BMW Key Fob

In the constantly evolving technological world of automotive technology, it's important for mechanics and locksmiths to keep up-to-date with key programming and duplicate. This will enable them to deal with complex issues such as BMW key fob programming.

Begin by putting your working key into the ignition and then turning the key to position 1. The accessories and dash lights should turn on.

What is EEPROM?

The EEPROM chip is a non-volatile memory that can be erased or changed. It can be used to store a variety of things, such as serial numbers as well as unique data, in almost every device connected to Ethernet. It is also the chip found in printers and charge cards and blood sugar monitors. It can also be used to keep data sequences that govern microcontrollers' operations, as well as to allow for recovering from power-on reset conditions.

The basic EEPROM chip has two field effect transistors. The floating gate is on one and the control gate is on the other. When the device is turned on the electrons are released. They may be held in a zero state or a state of 1 based on the voltage applied. The EEPROM can be read by monitoring the state of these transistors.

When the EEPROM is in the "0" state there is no value. When the EEPROM is in the "1" state it has a value of one. In between these states, no information is stored, but it is still possible to write. The EEPROM can also be erased using an appropriate voltage to the gate for a brief period of time.

The benefit of EEPROM is that it can be written to and erased without the need for any external circuitry. This makes it very useful in systems where the memory needs to be regularly updated for example, remote keyless microcontrollers in systems. There are various kinds of memory chips that offer similar functions, but are better suited to long-term storage.

Modern flash memory chips, for example, are very popular and are found in computers and digital cameras. They are used to store multimedia files for long-term storage and retrieval. But, they are not true EEPROMs and their primary functions differ from those of real EEPROMs. However, EEPROMs continue be widely used because of their versatility, and their ability to store minimal amounts of data in a limited space.

What is OBDII?

Up until recently, most automobile manufacturers had their own diagnostic systems to diagnose car problems. Then in 1996, the government mandated that all vehicles have a standardized system to read diagnostic codes. The new system, called OBD-II uses the same diagnostic code and port system for all brands and models that are sold in the US. This means that if there is problems with your car it will be easy for any mechanic to figure out what is causing the issue by plugging in a specific tool.

The OBD-II system detects a range of faults in the engine and other components of the vehicle using the standard diagnostic connector. The information is saved in the computer of the car to be later analysed. This lets the system detect and fix any issues before they cause major damage. The mechanic can connect an OBD-II scan tool to the port that will display error codes and inform where they came from.

Scan tools have more processing capacity than code readers and detect more types of error codes. They can also show live data graphs as well as record data for later analysis. Some tools are capable performing complex tasks like reprogramming an ECU or supplying enhancement options for performance. These tools are utilized by professional auto technicians and are usually more expensive than simple scanners.

When connecting a scanner to the OBD-II port it will recognize the protocol it is using and then communicate with the vehicle using the appropriate pins. There are numerous protocols. The most popular are SAE J1850 (KWP2000) that is used by Ford and certain GM automobiles ISO 14230-4, which is used in a variety of European and Asian vehicles, and CAN. Some scanners will tell you what the code means, whereas others will provide the code and will require some internet research to find out what it means.

What is CAS Unit?

The CAS unit is a BMW module that regulates the car's antitheft mechanism. The system works by analyzing the coded signal from the fob of the key, and verifying it using the CAS module. The CAS module will transmit an enable signal to engine control unit if the signal is valid. If the signal is not valid the engine will not start.

BMW CAS module failures could cause a number of symptoms including key fob problems, central locking, alarm activation, and dashboard warning lights. If you notice any of these symptoms, you should have the CAS Module examined immediately by an expert.

The CAS system uses the BMW ICOM VCDS to communicate with the engine and other vehicle systems. The VCDS connects to the CAS via a cable that is specially designed with a DIN connector at the end. The VCDS can perform a variety of functions, like display of error codes, or even adjusting ignition timing. It also provides a range of security features that protect the vehicle from theft.

BMW vehicles come with the CAS key module addition to the ICOM VCDS. g28carkeys.co.uk is powered by the ignition coil and is not designed to run on batteries. A transponder chip is embedded inside the key to transmit the signal that is coded to the CAS module. This is transmitted through loop antenna (coil) at the ignition lock.

The CAS state logic is implemented in the CasSystem class. You should create one instance of this class on every device that requires data from the CAS. Multiple instances of this class can cause undesirable behavior. In addition to providing information on state in addition, the CasSystem class also handles the display of alert messages. To do this, it publishes a cas_activate_alert topic that needs event data in the form of an object that has the key and priority properties. The topic contains the ID and, optionally, the suffix of the alert you'd like to activate, along with its priority level. The CasSystem will publish an alert message on the cas_alert_displayed topic and the hidden topic (defined by CasEvents). It will also subscribe to the cas_master_warning_active and cas_master_caution_active topics to consume their statuses.

How do you program a BMW Key

BMW offers drivers in the Murrieta area keyless entry, an easy feature that allows you to lock and unlock your car without having to use a physical key. The keyless entry system can only activated after the key fob is programmed to the car. You'll need to follow two simple steps.

The process is slightly different depending on whether you are pairing a new BMW key fob to your existing BMW, or beginning from scratch without a working BMW key. The first step is to take the working key fob as well as the ones you want to program inside of your vehicle, making sure all doors and windows are shut. Insert the working key into the ignition, and turn it to position one and quickly returning five times (do not start the engine). Turn the key back and remove it.

With the key fob still in your pocket hold the unlock button as you press the lock button (the BMW logo) three times in a row. Then release the unlock button, and the door locks should lock and unlock automatically. Repeat this process for each additional key fob you wish to program.

The last step is to connect your smartphone to your vehicle via Bluetooth. Log in to the BMW Connected application. The BMW Digital Key setup button will be displayed. This will enable you to use the key using the Digital Wallet App.

After you've completed the steps, you'll be able to ensure that your BMW key fobs are now ready to be used by the other members of your family as well as acquaintances on their Corona commutes. Our service department is ready to give you more tips and tricks on how to have a successful BMW driving experience.


The battery replacement in the battery of your BMW key fob is another task you may have to perform at times. Fortunately, it's a fairly easy task that can be completed at home. To change the battery, you only need to remove the key fob, carefully remove the older battery and replace it with the new CR2032. This will return your keys and have you back to your destination in no time!