C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

Can’t get in!

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Old Mar 26, 2021 | 07:35 AM
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C-class 2001
Can’t get in!

I have an old 2001 c-class. It’s been unused for the past months (in cold weather 🥶&#128584.
Now I can’t get into the car! Battery is dead. Manual key doesn’t work. What can I do? 😅
Thank you.
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Old Mar 26, 2021 | 08:02 AM
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What do you mean the manual key doesn't work?

Without being able to access or jump the car battery, you're looking at jimmying the door open or smashing a window.
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Old Mar 26, 2021 | 08:03 AM
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Happened to me once on my 2000 CLK430. I got in thru the trunk.
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Old Mar 26, 2021 | 08:07 AM
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^ That would work if the sedan has some kind of handle for folding the seats from the trunk, and if his trunk can be manually unlocked. Remember his car battery is dead.
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Old Mar 26, 2021 | 08:16 AM
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^ There was no need to use the seat release handles that are in the trunk to fold the seats forward. The trunk manual lock was the only lock that worked. I just got the trunk opened and put a battery charger on the battery in the trunk. 20 mins of charge and the key-fob opened the doors and the car started.
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Old Mar 26, 2021 | 08:19 AM
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The 2001 C class may have a manual trunk lock for the sedan, though OP mentioned his manual key doesn't work.

MB removed the manual hatch locks for the coupe in MY2003, so I assume this would also be the case for the sedan trunks.

The W203 battery is under the hood and not the trunk, so your solution wouldn't work.

Last edited by slammer111; Mar 26, 2021 at 08:58 AM.
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Old Mar 26, 2021 | 08:28 AM
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LOL....I just assumed it was in the trunk. Where's a car thief when ya need one ??
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Old Mar 26, 2021 | 12:25 PM
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You can jack up the car and connect another battery to the B+ terminal on the back of the alternator.
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Old Mar 28, 2021 | 05:52 AM
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C-class 2001
I don’t have any way of entering the trunk, there’s only the drivers door that can be opened with the key. And that doesn’t work, I can’t turn the key 😱
Thanks for the replies so far.
Any ideas? 😅
Attached Files
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IMG_7061.MOV (5.27 MB, 37 views)
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Old Mar 28, 2021 | 06:16 AM
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The part of the handle with the keyhole doesn’t quite line up. Guessing someone replaced the tumbler in the past with one from another car. You may want to get that fixed at the dealer.

There may be a keyhole next to the trunk handle. They were installed on the earlier build coupes at least. Dip your head and look upwards.

Otherwise you’re looking at connecting to the starter cable or the brick method.
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Old Mar 28, 2021 | 06:59 AM
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C-class 2001
Originally Posted by slammer111
The part of the handle with the keyhole doesn’t quite line up. Guessing someone replaced the tumbler in the past with one from another car. You may want to get that fixed at the dealer.

There may be a keyhole next to the trunk handle. They were installed on the earlier build coupes at least. Dip your head and look upwards.

Otherwise you’re looking at connecting to the starter cable or the brick method.
I have used the key a couple of months ago. How do I connect the starter cable without access to the battery?
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Old Mar 28, 2021 | 10:46 PM
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Starter motor is accessible from underneath the engine. Basically you'll be using the terminals as a jump point instead of the battery terminals.

In theory it should work since the starter draws a high amount of current. However I don't have information on which exact wires to use. You're trying to charge the battery, not crank the engine. Basically you'll need to disconnect the positive and negative wires (unless there is enough room to attach a thick enough jumper cable) to the motor and add a 12VDC power source there, possibly from another car or a battery of some sort.

Last edited by slammer111; Mar 28, 2021 at 10:52 PM.
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Old Mar 29, 2021 | 08:50 PM
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Originally Posted by crescens
I have used the key a couple of months ago. How do I connect the starter cable without access to the battery?
Jack up the car.
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Old Mar 31, 2021 | 11:02 AM
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Wouldn't need that much power. If you can connect a charger from underneath the draw power might be enough to open the door. If not just leave it to charge and you should be good to go.
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Old Mar 31, 2021 | 12:27 PM
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On that note, how did your physical key stop working if it worked before?

I'd also try spraying some silicone lube into the tumbler.
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