I called MB roadside assistance. They told me to spray WD40 into keyhole near trunk to get out the gunk, then press on the gray clicker 20-30 times. In fact, she said that's exactly what roadside service would do. I had seen a YouTube video with someone showing how you can hack up the car and connect positive terminal to alternator and negative to ground. When I mentioned this to roadside customer, she said she wouldn't recommend it because it could burn out some computer settings/read outs. She said that I would need to have the car towed to MB service who could hook up the car to dome computer that can unlock the car. Sounds like that could be expensive but I don't really know yet. What are my options? And why would connecting jumper o alternator cause damage? Would doing this allow me to use my key fab to open the doors? Any guidance you can provide would be greatly appreciated.

DJ in Houston

Comments

Profile picture for user MBFanatic
If it was my car I wouldn't connect a 12 volt source to the alternator. These cars are sophisticated and doing so can cause a lot of damage. The safest method is to locate the positive terminal in the passenger footwell. This will allow you to power up the car and you can also jump start the car from here. http://www.mercedesmedic.com/jump-start-w220-s-class-dead-battery/
Profile picture for user DJ
DJ, 2017-09-29

I forgot to mention that since the battery is dead, the key faub won't open the car door, so I have no way of getting inside the car. So given this information, what are my opinions?

Plain text

  • Allowed HTML tags: <a href hreflang> <em> <strong> <cite> <blockquote cite> <code> <ul type> <ol start type='1 A I'> <li> <dl> <dt> <dd> <h2 id='jump-*'> <h3 id> <h4 id> <h5 id> <h6 id>
  • No HTML tags allowed.
  • Lines and paragraphs break automatically.
  • Only images hosted on this site may be used in <img> tags.
The content of this field is kept private and will not be shown publicly.

2010 Mercedes ML350 BlueTec fuel leak (Left tank)

0
tarheel3759
6 days 20 hours ago
Mercedes » M-Class » 2006-2011

check liquid level

0
equintquant2
6 days 21 hours ago
Mercedes » C-Class » 2001-2007

Mercedes Benz clk w208 supercharger

0
timcolledge
1 week 2 days ago
Mercedes » CLK-Class » 1998-2003

Dodge. Journey 2015

1
TennesseeRebel
1 week 2 days ago
Dodge » Journey » 2009-____

Is it my ignition switch?

0
lcserna0423
1 week 2 days ago
Dodge » Caravan » 2008-____

2009 Mercedes e350 rwd 80 k miles

2
lucapuca
1 week 5 days ago
Mercedes

2006 chrysler crossfire convertible top problem

2
daisyblemmons
2 weeks 1 day ago
Chrysler » Crossfire

Problem with automatic start

4
abchris
2 weeks 1 day ago
Audi » A3 S3 RS3 » 2015-____

Mercedes ML350 bluetec sputter misfire

1
Nmerc
1 week 4 days ago
Mercedes » M-Class » 2012-____

Fuel issue

1
Andrew Williams.90
1 week 5 days ago
Buick » LeSabre » 2000-2005

Brake system

2
tammyduran
2 weeks 1 day ago
BMW » Z4 » 2003-2008

Best Shocks for Grand Cherokee

2
JohnSmith75
2 weeks 2 days ago
Jeep » Grand Cherokee

W212 AMG seat swap

1
GPone
1 week 6 days ago
Mercedes

do you need to register new battery on 2006 z4???

1
jdgallo
1 week 6 days ago
BMW » Z4 » 2003-2008

Mercedes CLA 250

4
jc71
2 weeks 2 days ago
Mercedes

CHANGING DASHBOARD LANGUAGE

2
Master
2 weeks ago
Volvo » S40, V40

2004 f150 wont start

1
dldiggs2
2 weeks 3 days ago
Ford » F-Series » 2004-2008

2006 chrysler crossfire convertible top problem

1
daisyblemmons
2 weeks 1 day ago
Chrysler » Crossfire » 2004-2007

Intermittent issue with low cranking power when ESC OFF light comes on

1
SteveJ27
2 weeks ago
Hyundai » Elantra » 2007-2010

Apple car play for 2016 e350 4matic

2
Triangle123
2 weeks ago
Mercedes » E-Class » 2010-2016

User has not asked any questions.