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E60 (2004 - 2010)
BMW 5-Series (E60 chassis) was first seen in the Unites States in the fall of 2003 with a 2004 Model Year designation. The E60 is now available as a 528i, 528xi, 535i, 535xi, 550i and a 535xi sports wagon! -- View the E60 Wiki

 
 
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Old 11-13-2012, 08:57 AM
KenWilk KenWilk is offline
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Location: Dallas, TX
 
Join Date: Oct 2012
Posts: 4
Mein Auto: 2006 525i
SOS Call System Malfunction

My problem finally solved. I took my 525i to an independent repair shop and in 1 hour they determined thru a diagnostic check that the Telematics Control Unit (TCU) was bad. After it was replaced everything works fine, including blue tooth. The TCU is an amplifier looking box located in the left rear of the trunk. It was easy to remove & replace.
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