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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

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 04-18-2015, 08:30 PM
javaman javaman is offline
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Location: in my car
 
Join Date: Jan 2015
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Mein Auto: e39
alarm goes off by itself..

my e39 alarm went off by itself today several times ... I could not shut it off with the remote key. When it stopped I tried to start the car but the cluster lights were blinking.
I took the alarm fuse out, I jumped it and it started right up.

battery voltage is at 12.4 on my interstate mtp 93 which is 4.5 years old today. I read that a low battery could trigger the alarm. True ? time to replace the battery ?
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  #2  
Old 04-19-2015, 08:20 AM
edjack edjack is offline
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Location: San Jose, CA
 
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Mein Auto: '97 540i 6 speed
Yes. Also, a bad hood sensor switch will trigger the alarm.

Routine trips are short and slow speed? May need to charge it every weekend. A fully charged battery reads 12.6+ overnight.
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Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.
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  #3  
Old 04-19-2015, 08:54 AM
Max_VQ Max_VQ is offline
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Mein Auto: E39 with a sweet six
Check you trunk wiring harness.
My alarm goes off at random due to broken wires.
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  #4  
Old 04-19-2015, 10:24 AM
javaman javaman is offline
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Quote:
Originally Posted by edjack View Post
Yes. Also, a bad hood sensor switch will trigger the alarm.

Routine trips are short and slow speed? May need to charge it every weekend. A fully charged battery reads 12.6+ overnight.
Thank you. I'll take it to my local napa shop to have it tested. I see the die hard 49 has 900cca vs 850 on the mtp93. Do you recommend one over the other ? the die hards always served me well in the past.

these batteries are expensive ! $175 plus tax

Last edited by javaman; 04-19-2015 at 10:35 AM.
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  #5  
Old 04-19-2015, 11:56 AM
edjack edjack is offline
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Location: San Jose, CA
 
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Mein Auto: '97 540i 6 speed
Stick with the brand you like. Make sure it has a vent hose connection.
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Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.
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  #6  
Old 04-19-2015, 06:20 PM
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QSilver7 QSilver7 is offline
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Mein Auto: 1997 740iL / 2006 X5 4.4
Quote:
Originally Posted by javaman View Post
Thank you. I'll take it to my local napa shop to have it tested. I see the die hard 49 has 900cca vs 850 on the mtp93. Do you recommend one over the other ? the die hards always served me well in the past.

these batteries are expensive ! $175 plus tax
Your car requires a 49/H8 battery class size. There are lots of brands out there that fit the bill. Most batteries in the USA are made by the big major 3: Johnson Controls, Exide, & East Penn/DEKA.

I just replaced 2 batteries last month...I got a Duralast 49/H8 DLG from Autozone...who price matched the Duracell 49/H8 I found at Sam's Club. You can see the price & specs & warranty of the Duracell (Sams Club). The Duracell is mfg'd by East Penn...see the chart below that gives the specs for their 49/H8 & 95R/H9 batteries...which are simlar to other manufacturer's specs (some less/some more):







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Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
(SOLD)
99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

http://imageshack.com/scaled/grid240/822/e38e532ndsigpic.jpg

Last edited by QSilver7; 04-19-2015 at 06:25 PM.
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  #7  
Old 04-19-2015, 10:08 PM
djmjd djmjd is offline
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Unplug the hood sensor and leave it unplugged.
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  #8  
Old 04-20-2015, 08:14 AM
javaman javaman is offline
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Great info. Thanks again.
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  #9  
Old 04-21-2015, 01:30 PM
mooal5 mooal5 is offline
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Mein Auto: 03 E39 540/09 E64 650
I had the exact same issue. My fix was as stated above hood switch culprit.

What had happened is the spot on hood underside where the switch touches when closed had worn a small divot in the felt. So when the hood was closed the alarm pin/switch was extended out more than usual. Car thought hood was being opened.
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