Support Center > Knowledge base> Article: How to Test your EWS 3 before replacing it.

How to Test your EWS 3 before replacing it.

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How do i know if i need a EWS kit or a Key set if my car stopped cranking? Is this an EWS Issue or a Key Issue?


We always need to Test the EWS First, remember the EWS system has a built in RELAY that basically just performs a U Turn to your starter. Lets first Locate your EWS since most models are different, you can click EWS Locations and you will find BMW and Mini Cooper EWS locations.

  • Step 1: Make sure that your car does Not Crank (Engine Doesn't Turn Over).
  • Step 2: Remove your EWS3 Unit and put it on the passenger seat so you don't forget its location.
  • Step 3: Insert a 30amp / 25 amp / 20 amp max! Fuse into Pin 1 & 2 into the EWS3 Female plug (See Picture Below). Remember there is No way the fuse will not fit, if you are having trouble simply turn the plug around and you will be fine.
  • Step 4: Try to Start the Engine, we are looking for a Crank only, the Engine will never run, however all we need at this point is to get the engine to turn over.
  • Probability if Yes ----> If No : If the Engine Cranks then you need to send over your EWS, all keys and order a BMW EWS 3.2 KIT (01/1997 to 03/1998) OR BMW EWS 3.3 KIT (03/1998 to 05/2006) or Mini Cooper EWS KIT from our online store.
  • If No (Engine didn't Crank) : You will need to make sure that Pin 1 or 2 is getting a 12V signal. (You will need a 12V Test light)
  • If you are getting 12V from pin 1 or 2 in the EWS Plug : This means your Starter inst getting a 12V signal ----> Go to your Starter and Verify you are getting a 12V signal ---- If Verified ---> Replace your Starter.
  • If you are Not getting a 12V signal from either pin 1 or 2 : Go back to your Ignition Switch and see if its producing a 12V signal ----> If no 12 v is coming out ----> Check if ignition switch has power.
  • If ignition switch has no power : Check fuses etc ---> if ignition switch has power ---> Replace Ignition Switch.

RPM MOTORSPORT LTD. Is only trying to help the BMW community and take no responsibility for You (The Customer) damaging any components in your vehicle, please make sure you have some kind of background in the BMW World.

EWS 3 Test


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Views: 281 Created on: Feb 26, 2017
Date updated: May 24, 2017

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