BMW debuted the EWS2 system in 1995 to passively immobilize engine management systems. This was the first time transponders with rolling type encryption codes have been put inside the ignition key.
The transponder code and the EWS module’s primary purpose was to cycle through the algorithm’s next number every time the key was turned. Additionally, the proper signal was provided to DME to enable the fuel and ignition procedures. The starter would also be disabled by the EWS module if the erroneous key was given.
Later in the manufacturing process, this was added to EWS 3 and installed closer to the transponder read coil, eliminating the need to install a read and transmit module next to the ignition switch. This mechanism, which is also present in MINIs, was in use until the E46’s discontinuation at the end of 2007.
The module was pre-programmed with 10 keys at the manufacture for the EWS2 and EWS3 models. Each vehicle received only three of the spare key identities, leaving seven in the module for potential future use. When new keys are obtained with all the necessary documents, the dealer issues these. They require only a brief remote control programming process before they are pre-programmed and ready to start the vehicle.
The assistance line is useful in this situation. This program has a problem. We frequently receive inquiries from mechanics who have serviced these models with EWS immobilization. Then they informed us that nothing we could have done could have caused our BMW to not start. It was only there for a small amount of work, but now it has a code for EWS interference or a bad key. One key belongs to the customer only! a
Did you keep the key in the ignition? Only for a few hours while we maintained it, but we always had a battery charger running.
It is a regular issue with this system that you were able to remove the key from the EWS. The system invalidates a key if it is turned on and the engine is not started for a prolonged period of time.
There is a fix. Using the right tools, you may read the MCU data included in the EWS, create a new key, and assign it to a spare location in one of the vacant slots in the remaining seven.
This programming can be done by any competent locksmith for you. Or have the primary dealer order a replacement for you.
In This Article...
E36 EWS: What is it?
BMW’s electronic drive-away protection system is known as EWS. Through the years, the E36’s exact EWS implementation changed a little bit, but the system’s basic lack of long-term dependability remained the same. Failures of modules, antennas, and keys are more frequent than they ought to be.
the EWS’s component parts. Drive-Away Security (EWS) From September 1993 to December 1993, production vehicles had the first iteration of Drive Away Protection fitted.
The EWS III D System performs
On E36/7, EWS III D is fitted at the start of the 99 Model Year. K-Bus input is not available on the system.
The EWS III D system is designed to offer vehicles without a K-Bus the highest level of drive away protection available. With the exception of an integrated EWS module and transmitter/receiver module, the input side of the control module operates similarly to an EWS II (no bus inputs) system. Similar to an EWS III (3.3) system, the output side features (Rolling codes). On the D-Bus is the EWS III D control module for diagnostic purposes.
The system’s functionality and individual component inputs are identical to those of the aforementioned earlier systems.
As replacement keys, up to 6 more keys may be ordered. Only 10 keys can be coded into the EWS III D control module (4 delivered with vehicle and 6 replacements).
Orders for replacement EWS III D Control Modules are made according to VIN. The original module’s (Rolling Code Table) is used to receive the new module.
When ZCS codes are received, the AutoHex scanner software (resets) the DME’s rolling code to (Rolling Code) #1, bringing both modules into synchronization.
Replacement DME Control Modules must be programmed for the specific vehicle and are (off the shelf). Following programming, the EWS III D control module is notified by the AutoHex scan tool software that a new DME has been installed. When the ignition is turned on the following time, the
The DME will get the complete (Rolling Code Table) from the EWS III D module and be reset to (Rolling Code).
The (Rolling Code Table) will be automatically burned into the DME’s memory. The table cannot be altered once it has been written to the DME memory. Due to this, a DME that has been (Married) to a car will not function in any other vehicles.
The alignment of the DME and EWS III D modules may still be required under certain circumstances.
The alignment process does not alter the code table; it just resets it to code #1. (Rolling Code Table).
It is possible to disable or disable the starter functionality on lost or stolen keys.
A (bar/release code) function that activates and deactivates EWS III D keys is included in the SERVICE FUNCTIONS of the AutoHex diagnostic scanner for EWS III D. Except for the key that was in the ignition when deactivation occurred, any key may be “Barred.” The remaining keys can be used to identify the missing or stolen key.
enables you to diagnose, code, program/flash ecus, replace with used ECUs, and add new keys for BMW. Autohex is one of the most professional scan tools available. For more details: BMW Scanner
Learn what users of Autohex II think about utilizing this product for advanced BMW services.
Join the AutoHex Onboard Diagnostic Forum to share advice on using the onboard diagnostic features.
Where in BMW is EWS located?
First, we’ll begin by removing and replacing your BMW E39’s Engine Computer (DME) (Scroll down forEWSRemoval)
1. Start by removing the push retention clips from the cover for the area just above the gas and brake pedals. The three Phillips screws are then removed.
2. Next, take off the two wood trims that are attached to the steering wheel’s sides. The electrical connector must also be unplugged.
3. Take off the cover that is just beneath the steering wheel. There are 7 Phillips screws holding it in. The leather component of that cover should then be carefully unclipped from the steering wheel using a flat-bladed screwdriver.
4. Directly beneath the steering column is where you’ll find the EWS module. Two Phillips screws hold the module in place. To remove it, you’ll need a little Phillips screwdriver.
Please look at the photos below; they will assist you in removing your EWS unit.
Describe EWS e46 m3.
A critical component of the BMW security system, the EWS control unit makes sure that the engine won’t start unless the proper “chipped” key is used.
As these vehicles begin to age and frequently require expensive repairs, the EWS system might become problematic.
EWS removal provides a smooth transition if a customer intends to track their vehicle or prepare the engine for an engine transfer into anything different. When installing used DME control units, this is very helpful.
To completely disable the EWS function, we physically remove the EWS control unit from the car, rewire the starting exciter, and reprogramme the DME control unit. Nothing needs to be aligned, etc. This service completely disables the factory immobilizer.
EWS remove E46: What is it?
Only previously sealed ECUs or ECUs that are Spec E46 at the time of sealing are eligible for the optional EWS Removal, which is offered at a significantly discounted cost (and purchase of Spec E46 calibration).
Your Spec E46 can start and operate without the instrument cluster or key being installed or in tact if EWS is removed. You must submit your current sealed, unaltered Spec E46 ECU if you later decide to purchase EWS removal for a sealed Spec E46 ECU; otherwise, you will be charged the sealing cost once more. Your ECU will be fully sealed (per Spec E46 standards) and equipped with tamper-proof seals when it is returned. If these seals are changed, you must return to Epic Motorsports for a thorough examination and possible reflash (and additional charge).
You must submit the ECU from your running automobile as a core for any ECU work. The approximate date of the switch from the Ms43 to the Ms45 ECU is 7/2003 manufacturing, but please verify by visually reading the label on your ECU before purchase.
Please ask about the Epic Motorsports calibrations we offer for a variety of BMW models.
Processing Guidelines Your ECU must be taken out and sent directly to Epic Motorsports. Include a printed copy of your BimmerWorld order along with $600 worth of insurance with your shipment. Then send an email to [email protected] with your tracking number and your BimmerWorld order number. To: Send an insured ECU package
Your ECU’s sealing procedure will take longer to complete than a bespoke flash and could take up to one business week. If you plan ahead, rush processing is an option. You MUST discuss this with your salesperson at the time of purchase to find out if your current work schedule permits the expedited processing.
Your ECU cannot be overwritten or modified in the future once it has been sealed. For a cost, Epic Motorsports will be able to undo this technique in the future, but it will necessitate opening the ECU and destroying the Spec E46 Seals. You must deliver your ECU to Epic Motorsports for a thorough examination and probable reflash if your Spec E46 seals are damaged (and additional charge).
Emissions Non-Compliance Notice. This item is only meant to be used with racing cars that are never allowed to be registered or licensed for usage on a public roadway. A pollution-controlled road vehicle’s emissions equipment cannot be removed, disabled, or altered. It’s also prohibited to install hardware or software on a road vehicle that tricks, disables, or modifies emissions controls and monitors. This item is exclusively sold for off-road racing, competition, track, recreational, or other uses. Any motor vehicle that is subject to emissions inspection or control is not allowed to utilize it. Any state, province, or other jurisdiction that is subject to, or has implemented, CARB or EPA laws does not permit its installation or usage on any pollution-controlled motor vehicle. BimmerWorld maintains the right to cancel any part(s) that are not for legal racing or track purposes and may verify a customer’s racing license, entry, or participation in a race. Certain states or territories are exempt from some suppliers’ shipping policies, which results in longer delivery times. Any delays will be communicated to you.
What does BMW CAS stand for?
The CAS allows BMW automobiles to be started and acts as an anti-theft alarm system. For safety reasons, the CAS module creates a random key code each time your BMW is turned on and syncs it with the Engine Control Unit/DME. To start the car, the CAS must pair with your key.