Lost of sound system

2004 MERCEDES BENZ E320
95,000 MILES • 6 CYL • 2WD • AUTOMATIC
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CALJOY
  • MEMBER
  • 2 POSTS
What cause's message display ( Battery Protection convience functions temporariliy unavailable)
Jul 12, 2011 at 5:05 AM
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RIVERMIKERAT
  • ✓ASE Certified Mechanic
  • 6,110 POSTS
  • ASE Certified Mechanic
Check the condition of the auxiliary battery first, then check the main if the auxiliary checks good. It's one or the other.
Jul 12, 2011 at 5:22 AM
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CALJOY
  • MEMBER
  • 2 POSTS
Both batteries have already been replaced
Jul 12, 2011 at 5:30 AM
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RIVERMIKERAT
  • ✓ASE Certified Mechanic
  • 6,110 POSTS
  • ASE Certified Mechanic
The message you mention pertains to an issue with the battery system. Using a multi-meter, make sure the alternator is putting out between 13.4 and 14.2 volts with the engine running and headlights turned on. If not, you have an issue with the alternator or regulator.
Jul 12, 2011 at 10:54 PM
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