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2009 CLK550, 2007 E350 4Matic Sport
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just got back from 10 days away, and the C280 appears to have a dead battery (which I had just replaced in February; maybe I need an alternator?). remote won't unlock doors, so I used the mechanical key, and once inside, no lights on dash, and the key won't turn (?) in the ignition. worst of all, the trunk won't open, so I can't try to simply jump the battery. I can push the trunk release in to no avail, and, using the mechanical key, can lock (horizontal) and unlock (vertical, which is how I usually have it) the trunk, but it won't pop open. any ideas?
 

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W203 modified
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2,032 Posts
eddieo45 - 4/25/2005 6:35 AM

just got back from 10 days away, and the C280 appears to have a dead battery (which I had just replaced in February; maybe I need an alternator?). remote won't unlock doors, so I used the mechanical key, and once inside, no lights on dash, and the key won't turn (?) in the ignition. worst of all, the trunk won't open, so I can't try to simply jump the battery. I can push the trunk release in to no avail, and, using the mechanical key, can lock (horizontal) and unlock (vertical, which is how I usually have it) the trunk, but it won't pop open. any ideas?
Someone invented a jump-start battery that sits in the cigarette lighter and give the car enough to crank over or in your case pop the trunk.

If you can find one of those semi-professional boost starters then I would use that. Just dont get the current ratings wrong with the wiring you may want to use.

I dont know how good you are with the car electronically but if it is anything like a W203 then there is a " + " under the bonnet for jump starting with a red cap on it marked " + "

The ground is obviously the body of the car.
 

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1995 C220 & 2005 SLK230
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9 Posts
I believe that there is a manual trunk release behind the center rear seat arm rest.

Be sure to use the main key and not the valet key to open the trunk.
 

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put the blade key in the trunk lock, turn it all the way to the right (or maybe left), while you have it turned all the way, then push it in.
 

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2006 CLS500 - Iridium Silver w/ AMG Sportline
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232 Posts
Be lazy and take advantage of your MB lifetime roadside assistance...[:D]
 

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1999 C280 210k miles
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200 Posts
I will never cease being an idiot.....

So I have the A/T drained and filter pulled. I go to the trunk to grab the new pan gasket and filter but.....dead battery. I left the key in ignition, perhaps not in the 0 position.

Anyway, battery is dead and I can not open the trunk with the key or the button behind the rear arm rest. The valet key is all I have and it wil lnot turn right or left in the lock. A few years back the trunk latch got stuck closed and a locksmith skillfully opened her up.

So, any ideas about how to either get some power to the car or et the trunk open?

BTW, I don't want to start the engine because the tranny is dry!
 

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1997 W202-C180 Classic, smoke silver metallic, Lowered
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271 Posts
here's a link that should help
http://www.benzworld.org/forums/w202-c-class/1416687-dead-battery-open-boot.html
it'll just get your car started so you can open the boot, charge up the battery, etc.\
btw, there's a brown wire that's bolted to the body in the engine bay, this is a good place to place the ground/negative lead

also gmascoli, try charging the battery through the points mentioned above, or just enough so you can get the boot/trunk open
 

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1997 C280 (Cambria).
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521 Posts
Someone invented a jump-start battery that sits in the cigarette lighter and give the car enough to crank over or in your case pop the trunk.
That sounds like a fire waiting to happen! Considering the high amount of amperage needed to start a car, let alone the EXTRA amperage these kind of cars need since the battery is in the trunk.

There is no way the wires running to the cig lighter would handle such amperage, they are made to handle 10A TOPS. Not near a thousand...
 

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1999 C280 210k miles
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All
Thanks for the input. I'm back alive again. Best solution is to locate the positive terminals in the engine bay and jump to a good battery to open the trunk. That's what I did, very easy. The positive terms in the 99 C280 are in a black box adjacent to the fuse box. Some threads have pictures of what to look for.
I would not try to start the car by jumping here, but this is the right method to open the trunk.
 

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Trickle Charge

The cig lighter adapter is just meant to trickle charge the battery. Plug it in and go take a nap. Come back in a couple of hours and try and start the car.
 

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1997 C280 (Cambria).
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The cig lighter adapter is just meant to trickle charge the battery. Plug it in and go take a nap. Come back in a couple of hours and try and start the car.
Thatd be a long nap! Assuming the battery is completely flat. At a 2-7A charging rate haha. Lookin at 10 hours to get any good juice outta it.
 

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So, like most people here, I had this same issue. I replaced the alternator, and thought that as long as I left the car unlocked, that the trunk release would work by pressing the lock. It did not. So I tried the little physical key that is in the fob, and I was able to lock and unlock the trunk, and move the key a quarter turn left, but the trunk never opened. In a fit of pique, I took the key out and turned it over. This time when I turned it a quarter turn to the left, the trunk opened.

Unfortunately, that key is really tiny, and it has a tab on the top that is convenient for your thumb to use to turn it. Unfortunately, that means the key is upside down.

So if there is anyone else who came to this thread because that key didn't work, try turning it over.
 

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W202 C1997
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301 Posts
The key blade will work whichever way round it is inserted into the lock.
The reason it failed to unlock was because the key wasn’t pushed inwards as illustrated in Picture 4 below.

Dec

 
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