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
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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RIVERMIKERAT
  • CAR REPAIR CONTRIBUTOR
  • 6,110 POSTS
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
  • CAR REPAIR CONTRIBUTOR
  • 6,110 POSTS
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