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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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Old 03-08-2013, 12:01 AM
hugo_za hugo_za is offline
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Location: Johannesburg, South Africa
Join Date: Mar 2013
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Mein Auto: E65 740i LCI
How to replace Fuse 48?

Hi All,

I mistakenly pulled out trunk fuse 48 yesterday and now when I put it back my car just starts squealing a very high pitch solid tone. I have pressed the buttons, started her, but still the squealing persists. How do I re-insert fuse 48 without this happening, because right now my alarm system is not working?
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Old 03-08-2013, 03:23 AM
esilvas esilvas is offline
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Location: Converse, TX
Join Date: Oct 2012
Posts: 79
Mein Auto: 2001 540i
I had the same problem. Just put it in and wait about 30sec. It should stop. In my case, I had a bad battery. Once I put in a new one, the problem went away. Hope that helps.
Just looking to have some fun while enjoying the ride.

'01 540i 6-Speed
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Old 03-08-2013, 04:07 AM
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bluebee bluebee is offline
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Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
I've never pulled fuse 48, but one of the parasitic drain diagnostic procedures is to pull fuses one by one to check current drain, so, if the steps for pulling fuse 48 are different than the rest, let us know so we can modify the diagnostic procedure.

See also:
BMW_EWS_Drive_Away_Protection_Alarm_System.pdf (709.3 KB, 284 views)

Doing a basic search for "fuse 48", I find some interesting quotes:

Originally Posted by Bigset3102 View Post
i found that if you pull fuse 48 in trunk it disables alarm while keeping locking system working. if your alarm doesnt go off when you pull fuse 48 then the rechargable batteries in your siren are bad and supposedly if you replace those everything will work again
Some other tidbits on what happens when you pull fuse F48:
Originally Posted by Belicek View Post
Fuse 48 being unplugged does NOT disarm the security system; just the siren, lights will still flash if the alarm is activated.
Originally Posted by txtigr View Post
I removed fuse 48 from the trunk fuse panel, and even though siren would not sound, lights would still flash while alarm was going off at random..
Originally Posted by Wolfey View Post
remove the anti-theft alarm fuse. The fuse is located inside the passenger side trunk wheel well area, a 5 amp fuse #48. This will disable the alarm, but it will still allow you to lock and unlock the car, both manually and with the key remote. No whistle will accompany locking or unlocking, but the lights will still flash.
Please read the suggested threads and add value, either by pictures or by descriptions, so the next person stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need

Last edited by bluebee; 03-08-2013 at 05:21 AM.
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