If you are a BMW E90 owner, you may encounter issues with the Electronic Immobilizer System (EWS) from time to time. The EWS is designed to prevent the car from starting without the correct key, but sometimes it may malfunction and prevent the car from starting even with the right key. In such cases, performing an EWS reset can help resolve the issue. In this article, we will guide you through the steps to reset the EWS on your BMW E90.
What is EWS?
The Electronic Immobilizer System (EWS) is an anti-theft system installed in BMW vehicles. It is designed to prevent unauthorized access to the vehicle by immobilizing the engine. The system works by reading the transponder chip in the key and then sending a signal to the engine control unit (ECU) to enable the engine to start. If the EWS detects an invalid key or a problem with the system, it will prevent the engine from starting.
When to Reset EWS
There are several scenarios in which you may need to reset the EWS on your BMW E90:
- When the car does not start even with the correct key
- After replacing the EWS control unit
- When the EWS system malfunctions or displays error codes
- After performing repairs or maintenance on the EWS system
How to Reset EWS on BMW E90
Resetting the EWS on your BMW E90 involves a series of steps that can vary depending on the specific model and year of your vehicle. It is recommended to consult the vehicle’s manual or seek professional help if you are not familiar with the process. However, here is a general outline of the steps involved in resetting the EWS:
Step 1: Disconnect The Battery
Before attempting any work on the EWS system, it is important to disconnect the battery to prevent any electrical issues or accidents. Locate the vehicle’s battery and safely disconnect the terminals.
Step 2: Locate The Ews Control Unit
The EWS control unit is typically located in the engine bay or the passenger compartment of the vehicle. Consult the vehicle’s manual or online resources to find the exact location of the EWS control unit in your BMW E90.
Step 3: Perform A Hard Reset
With the battery disconnected and the EWS control unit located, you can perform a hard reset by removing the EWS control unit from its location. After removing the control unit, wait for a few minutes before reinserting it back into place.
Step 4: Reconnect The Battery
Once the EWS control unit is reinstalled, reconnect the battery terminals ensuring a secure connection. This will power up the EWS system and reset any fault codes or errors that may have been present.
Step 5: Test The System
After resetting the EWS, it is important to test the system to ensure that the issue has been resolved. Attempt to start the vehicle with the key and check for any error messages or warning lights on the dashboard.
Seek Professional Help
While the steps outlined above provide a general overview of the EWS reset process, it is crucial to exercise caution and seek professional help if you are unsure about performing the reset yourself. Consulting a qualified BMW technician or mechanic can ensure that the EWS reset is performed correctly and safely.
Frequently Asked Questions On How To Reset Ews On Bmw E90 : Step-by-step Guide For Success
What Is Ews In A Bmw E90?
The EWS (Electronic Immobilizer) in a BMW E90 is a security system that prevents the car from starting unless the correct key is used.
Why Would You Need To Reset The Ews On A Bmw E90?
Resetting the EWS on a BMW E90 may be necessary when experiencing starting or immobilizer issues, or when replacing the EWS module or key.
How Can I Reset The Ews On My Bmw E90?
To reset the EWS on a BMW E90, you can try disconnecting the car’s battery for a few minutes or using a diagnostic tool to reset the system.
Is It Possible To Reset The Ews Without Special Tools?
In most cases, resetting the EWS on a BMW E90 requires special diagnostic tools or professional assistance to ensure proper reprogramming.
Conclusion
Resetting the EWS on your BMW E90 can help resolve issues related to the vehicle not starting or EWS system malfunctions. By following the outlined steps and seeking professional assistance when needed, you can ensure that the EWS reset is performed effectively. Remember to always consult the vehicle’s manual and exercise caution when working on the electrical systems of your vehicle.