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Battery dead, how to open the trunk?

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Old Nov 22, 2019 | 03:21 PM
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Battery dead, how to open the trunk?
Need some help. C43 battery is dead and cannot be charged any more: is there a way to open the trunk?
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Old Nov 22, 2019 | 03:34 PM
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05 c55 silver, 98 Imperial Red C43
yes under the hood look for this box.

Open it and connect positive to it and negative to the body

Right behind the water tank, black rectangular box with an x on it.


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Old Nov 22, 2019 | 03:54 PM
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Originally Posted by PJmak
yes under the hood look for this box.

Open it and connect positive to it and negative to the body

Right behind the water tank, black rectangular box with an x on it.

Thanks, used this method in the past.
Unfortunately, the battery reached the point of no return: it’s at 1.96V with charger attached....

Trunk is not locked, but does not open with dead battery. Is there manual override?
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Old Nov 22, 2019 | 04:03 PM
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maybe disconnect battery and then hook up charger ? battery may be pulling the voltage down....
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Old Nov 22, 2019 | 04:11 PM
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2000 (W202 C200) & 2000 (W202 C55)
You can use your metal key,

just inset it and twist it clockwise, then press the button inward , it will opened,,

Did you try that..??

-;-ZAYED-;-
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Old Nov 22, 2019 | 04:22 PM
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05 c55 silver, 98 Imperial Red C43
Are the rear folding seats unlocked??(I always leave mine unlocked for this specific reason)

If so climb into the trunk and hook up the wires directly to the battery.

I had to do this on my car.
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Old Nov 22, 2019 | 04:40 PM
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Originally Posted by mrmotoguzzi00
maybe disconnect battery and then hook up charger ? battery may be pulling the voltage down....
well, this is the first thing to do once I get to the battery ... unfortunately it’s in the trunk....
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Old Nov 22, 2019 | 04:42 PM
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Originally Posted by cm60k
You can use your metal key,

just inset it and twist it clockwise, then press the button inward , it will opened,,

Did you try that..??

-;-ZAYED-;-
this was the first thing I tried, but nothing happens

when battery is charged, just pressing the button inward opens the trunk, don’t need the key
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Old Nov 22, 2019 | 04:48 PM
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Originally Posted by 6G Schnell
well, this is the first thing to do once I get to the battery ... unfortunately it’s in the trunk....

Argh sorry I didn't now...

someone had mentioned the back seat ? in your car does it fold down ?
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Old Nov 22, 2019 | 04:58 PM
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05 c55 silver, 98 Imperial Red C43
How long did you have it hooked up to the car under the hood??

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Old Nov 22, 2019 | 05:03 PM
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I have your user manual in pdf...

unsure if this work...

looks like the key has 4 positions...

10 oclock
12 oclock
2 oclock
3 oclock

with the mechanical key...

turn to 10 oclock, hold it there and push....

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Old Nov 22, 2019 | 05:05 PM
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05 c55 silver, 98 Imperial Red C43
On my black car, the metal key wont open the trunk.

If you have spare keys, try with that key maybe youll get lucky.

On my other c43, turning the key in one direction and pushing while the key is turned works. I believe its to 10 o clock like mentioned above
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Old Nov 22, 2019 | 05:06 PM
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It should open with metal key my battery was dead a few weeks away that’s the only way I got in
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Old Nov 22, 2019 | 05:15 PM
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Thanks guys...
Just started dismantling fuse box in hope to disconnect the battery and then apply voltage to central locking system (7,8,17)....

Glad went back to check this thread and the good news is key in 10 pushed inward did the magic,
tried this with bare hand and did not work, pliers are really needed for this!
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Old Nov 25, 2019 | 11:50 AM
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C43
In my experience the Valet key is of no use opening the trunk when the battery is dead, I've tried. But running a positive cable to the part in the front works. Another thing you can do is get a battery charger that charges through the cig lighter, then you can run power, pop the trunk and go from there.
---Adam
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Old Nov 25, 2019 | 12:01 PM
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05 c55 silver, 98 Imperial Red C43
Always leave your folding seats unlocked that way if anything you can climb in through there and get access to the battery
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Old Nov 25, 2019 | 12:15 PM
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Originally Posted by unobtanium-inc
In my experience the Valet key is of no use opening the trunk when the battery is dead, I've tried. But running a positive cable to the part in the front works. Another thing you can do is get a battery charger that charges through the cig lighter, then you can run power, pop the trunk and go from there.
---Adam
Yes, same happened to me: there is no way to open the trunk using bare hands. My fingers were hurting so bad.... Somebody called this key "torture device", which is true.

However, using pliers was able to open the trunk!
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Old Nov 25, 2019 | 12:16 PM
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Originally Posted by PJmak
Always leave your folding seats unlocked that way if anything you can climb in through there and get access to the battery
Thanks, good idea!
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