S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

Battery flat, can't get into trunk HELP!

Old Mar 7, 2010 | 07:53 AM
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W140
Battery flat, can't get into trunk HELP!

My w140 S Class has a dead/flat battery and although I have three sets of keys they won't turn the lock in the trunk/boot - I have probably never had to use the key for this purpose. I can't get access to the battery to give it some charge and can't find any other way of bring the car back to life. someone said use a point on the alternator but I'm not too sure. Any help from anyone who has had this problem or knows these cars would be greatly appreciated.

Thanks
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Old Mar 7, 2010 | 08:16 AM
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The trunk will unlock/open without the battery/power. You might have to try turning the key and pull up on the lid to help it. It you turn it one way and pull up on the lid and it won't open..then just turn the key the other way and pull the lid up....it's either clockwise or counterclockwise! But it will open! It won't "pop" up....no power..you gotta help it!
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Old Mar 9, 2010 | 12:29 PM
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1995 S320V
flat bat

you could try the type of battery charger that plugs into the cigarette lighter, to supply power.
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Old Mar 9, 2010 | 07:13 PM
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Originally Posted by barry S320V
you could try the type of battery charger that plugs into the cigarette lighter, to supply power.
yes this is the simplest solution... these things that plug into cig lighter are generally not powerful enough to start the car, but will give enough power to operate the power trunk release.

heres an example for $25
http://www.amazon.com/exec/obidos/tg...X0DER&v=glance
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Old Jun 5, 2015 | 04:59 AM
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mercedes S320
S class dead batery cant get into car

Originally Posted by benica
The trunk will unlock/open without the battery/power. You might have to try turning the key and pull up on the lid to help it. It you turn it one way and pull up on the lid and it won't open..then just turn the key the other way and pull the lid up....it's either clockwise or counterclockwise! But it will open! It won't "pop" up....no power..you gotta help it!
Hi ive tried the spare key in driver door and boot lid the key wont turn eithr way to let me in the car at all any help would be great thanks.
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Old Jun 8, 2015 | 07:56 AM
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Call locksmith or dealer...
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