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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 09-15-2014, 08:38 PM
Registered User
Location: SOLEDAD
Join Date: Sep 2014
Posts: 1
Mein Auto: BMW 525i
cluster lights flickering when on road

hello everyone, this is my first post and fairly new to the BMW world but must say I'm loving it. Anyhow, i recently replaced the fog lights on my 2003 525i with the bright LED aftermarkets and noticed that the instrument cluster began to erratically light up all the symbols on it. I was told today that the passenger fog light was flickering so i put two and two together. Can replacing the factory fogs with the bright LED fogs cause the cluster to light up erratically? any advise would be greatly appreciated, thanks FERNY

Last edited by FERNY LOPEZ; 09-15-2014 at 09:53 PM.
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Old 09-15-2014, 11:19 PM
edjack edjack is offline
Officially Welcomed to the 'Fest
Location: San Jose, CA
Join Date: May 2007
Posts: 9,214
Mein Auto: '97 540i 6 speed
Do they flicker when the fog lights are off? If not, one can assume that the fog lights are at fault.

The exterior lights are controlled by an electronic module. Very possible that the fog lights have an effect. The module is very sensitive to the wrong loads. Some have had to install flicker eliminators.

Just to rule out battery problems, using a DMM, measure the overnight battery voltage, and when the engine is running. The former s/b 12.5+, and the latter 14+. If you get lower voltages than these, you may have a battery or alt problem.

Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.

Last edited by edjack; 09-15-2014 at 11:23 PM.
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