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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 05-31-2020, 01:19 PM
mjbjr mjbjr is offline
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99 540i key will not start engine

the key for my 99 540i operates all functions except it will not energize the starter. Any suggestions?
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  #2  
Old 05-31-2020, 02:14 PM
528iAut 528iAut is online now
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So what happened? You only have one key?
Maybe you should order another key?
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  #3  
Old 05-31-2020, 03:39 PM
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mattmar1 mattmar1 is offline
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could be the starter, wiring to the starter, key not being recognized by the EWS, and other things. do you have INPA? that would tell you pretty quick if the EWS is doing the correct thang.
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  #4  
Old 05-31-2020, 04:34 PM
edjack edjack is offline
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Is this a key you have just bought, or is it an original??
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  #5  
Old 06-01-2020, 04:57 AM
mjbjr mjbjr is offline
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It is the original which I have used. The unused original key is the one that works fine. I did change the battery on the one that works on all functions except energizing the starter.
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  #6  
Old 06-01-2020, 06:44 AM
528iAut 528iAut is online now
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Unfortunately the battery has nothing to do with your problem, the ews system is not allowing the key to start your car. There is a way it can start it I think, if you have driven the car with the key that works you can shut off the engine and within 10 seconds start it again with the faulty key. I am not sure if the ews will then accept the key again later, don't think so but maybe you can try?
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Old 06-01-2020, 07:12 AM
toybreaker toybreaker is offline
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you need to scan the EWS with that key in the ignition.....
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  #8  
Old 06-01-2020, 07:49 AM
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QSilver7 QSilver7 is offline
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Quote:
Originally Posted by mjbjr View Post
It is the original which I have used. The unused original key is the one that works fine. I did change the battery on the one that works on all functions except energizing the starter.
Uh oh...before you opened the key to change the battery...did this key have an issue starting the car? If not, then I would recommend opening the key again to see if the EWS transponder is still inside. Perhaps when you opened the key...the EWS transponder fell out.

The EWS feature of the remote does NOT require the use of the remote's battery. It is self powered through induction...and if the transponder isn't there...then the key won't start the car. (see 2nd image below)

The central locking (FZV) & alarm siren (DWA) for lock/unlock and arm/disarm...DOES require the battery inside the key to transmit the 315 MHz radio frequency signal. So if everything works except the ability to start the car...then something happened to the EWS feature of the remote. Again, reopen the remote to see if the EWS transponder is still there. If it did fall out...then I'd go back ASAP to the area where you replaced the battery to see if you can find it.

See pic below as to what the EWS transponder looks like and where it resides inside the remote key:




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Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 2013 F06 650ix Gran Coupe` (Black Sapphire) 1/13 mfg date
(SOLD)
97 740iL (Arctic Silver) <<~>> 99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

https://www.bimmerforums.com/forum/attachment.php?attachmentid=637911&d=1538398374&thumb=1&stc=1

Last edited by QSilver7; 06-01-2020 at 08:03 AM.
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  #9  
Old 06-01-2020, 08:58 AM
mjbjr mjbjr is offline
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I started the engine with the good key and within 10 seconds plugged in the old key and it worked, and continued to start the engine. MANY, MANY THANKS FOR YOUR SUGGESTION.
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  #10  
Old 06-01-2020, 10:19 AM
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QSilver7 QSilver7 is offline
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Quote:
Originally Posted by mjbjr View Post
I started the engine with the good key and within 10 seconds plugged in the old key and it worked, and continued to start the engine. MANY, MANY THANKS FOR YOUR SUGGESTION.
That won't tell you if your remote isn't working because EWS identification is CANCELLED for 10 seconds after a working key is used.

The next time you try to use the remote that wasn't working...and you haven't used a working key in the last 10 seconds prior...the key still may not work.

Again, double check that the EWS trasnponder chip is still inside your remote key before you declare success. The EWS 10 second cancellation (from the DME) may be giving you a false/positive.

See the information below in the highlighted box...that explains what I wrote above.

Attached Thumbnails
Click image for larger version

Name:	EWS%2010%20Second%20Cancellation%20by%20DME.jpg
Views:	20
Size:	44.7 KB
ID:	894959  
__________________
Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 2013 F06 650ix Gran Coupe` (Black Sapphire) 1/13 mfg date
(SOLD)
97 740iL (Arctic Silver) <<~>> 99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

https://www.bimmerforums.com/forum/attachment.php?attachmentid=637911&d=1538398374&thumb=1&stc=1

Last edited by QSilver7; 06-01-2020 at 10:21 AM.
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