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Cigarette lighter power always on? 2003 C240

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Old 08-25-2011, 02:26 PM
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Cigarette lighter power always on? 2003 C240

Hi all, long time forum viewer, first time poster. I am wondering if anyone knows how to make the cigarette lighter power stay on even when the car is turned off in a 2003 C240. I have seen some forum posts regarding this in the E-class, but I am not sure if the idea is the same in my car. Can anyone point me to some documentation or have knowledge of this?

Thanks in advance
-oriz
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Old 08-25-2011, 04:49 PM
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Cigarette lighter should be on all the time.
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Old 08-25-2011, 09:13 PM
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It's not. When I take out the keys, the power shuts off.
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Old 08-25-2011, 10:04 PM
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
OK - Yours is different to mine. Mine is like an Audi. SA assembly

Then take constant power from the fuse box in the side of the dash.


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Old 08-25-2011, 11:42 PM
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So it's not possible to make the cigarette lighter stay on?
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Old 08-26-2011, 03:51 AM
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Why are trying to do this? If you just want a constant 12v even if the car is off your radio has a constant 12v you can tap into.
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Old 08-26-2011, 06:25 AM
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I'm trying to charge a cell phone with the car off and not have to splice any wires if I can get away with it.
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Old 08-26-2011, 03:23 PM
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
You have a choice - Take it from the fuse box. Rewire your cig lighter to a 20amp permanently on tap in the fuse box.

Stay away from taps that go to sleep with the CANBUS like the radio.
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Old 08-26-2011, 09:19 PM
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What's involved in rewiring it to the 20A fuse? Just a matter of moving a couple wires or is there soldering and stuff involved? I'm totally new to this and haven't taken a look at the fuse box yet.
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Old 08-27-2011, 09:50 AM
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
As cars vary you need to take a meter & find a tap in the fusebox that has a wire going to it as fat as the one going to the cig lighter & make sure it does not go to sleep with the CANBUS. Then run a new wire from there to the cig lighter. This requires some careful stripping of the dash & console to feed a new wire.

If your car was prewired for a cell phone then the wiring will be there already at the side of the console. Only Benz can tell you from your VIN whether the car is prewired.
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