There are many "myths" and misunderstandings virtually BMW ECU / DME reprogramming. Nosotros promise to help answer and give you solutions to the most commonly asked questions.

My mechanic/dealership says that you can't reprogram, re-code, or swap a used BMW ECU betwixt cars. How tin can you lot help me?

This is truthful, but we accept the solution!

Always since December of 1994 BMW added a new Engine Management technology as an anti-theft measure out.

The new anti-theft engineering is a device called the "EWS", which is also known equally the "Immobilizer". This module compares the VIN number of the car between dissimilar electronic modules in the car. If the VIN number isn't consistent, the car will not beginning.

Also the EWS has a password characteristic called the "Rolling Code" which changes betwixt the modules every time that the car is turned off. This makes information technology virtually impossible to bandy used ECU'due south betwixt BMW cars.

Even so, we've establish a style to work around this.

Nosotros tin can reprogram a used ECU using another VIN number and reset the Rolling Code, nigh making the unit "virgin". Merely then, can we successfully substitution and swap a used ECU to piece of work in another BMW auto. All you lot need to do is align our ECU to your automobile's EWS using this USB Interface Cablevision Car with you laptop USB connection and the car's OBD2 Diagnostic terminal.

Why can't I purchase a used BMW ECU online and install into my motorcar myself?

Because if you install a used ECU in whatsoever BMW, the VIN number and Rolling Code will not match, and it volition prevent the motorcar from starting.

The EWS was created for this very purpose. What happens is that the EWS organization connects with the fundamental transponder, but fails to properly communicate with the DME. The car might crank, but the DME will never get the "permission" to ability the fuel pump and send the spark signals.

When I purchase an Exchange BMW DME from you, will the unit be Plug and Play?

Our Exchange ECU'due south are programmed to your BMW's VIN number.

Even so, due to the fact that the EWS systems take a random "Rolling Code" we can't guess this code.
Therefore, nosotros reset this feature in gild to make the ECU "blank".

In order for the unit to piece of work in the car, a DME to EWS Alignment/Synchronization has to be carried out.

This is done using a BMW scanner like this USB Interface Cable Motorcar with you lot laptop USB connexion, a GT1, ISTA, Autologic, Launch X431 or Baum Tool DS2021. It takes five minutes to "marry" the ECU to your car, and and then the ECU is set to first the car.

If you Repair my ECU, do yous I need to "re-flash", "re-code" or "re-plan" the ECU earlier installing back into my car?

No.  ECU re-programming is not required because nigh repairs are washed on the hardware parts and not on the software programming. Therefore, the programming of the ECU will never exist altered.

Every mechanic and dealership will oftentimes use different words and terms to explain to y'all how ECU'southward and scanners work, which can be confusing.

Here is a quick "definitions guide" to help yous understand them meliorate:

  • BMW Scanner: They are used to scan all the electronic modules in the car to detect out what may be causing a Check Engine Light to come on, or to define fault codes found in the modules to figure out, and to install software updates on the electronic modules of the vehicle.
  • DME ECU Programming: This is the same as when you install the the Windows Operating Organisation in your desktop estimator. This process tells the DME to which car it will installed in and how it should manage the engine performance while the auto is working. The reprogramming process takes an average of 45 minutes to 1 hr.
  • DME ECU Recoding: This process sets on the ECU the VIN number, programming codes, and manual settings. Many times this process is done together with the ECU Programming.
  • DME Alignment/Synchronizing: This is a elementary "Copy & Paste" process which takes simply 5 minutes. The BMW Scanner copies the "Rolling Code" from the EWS and Pastes information technology in the DME retentiveness. This procedure "marries" a new ECU to the vehicle assuasive information technology to start.

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These are some OBD2 BMW scanner tools that we recommend to begin diagnosing your ain automobile:

   

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