E-Class (W211) 2003-2009

Cigarette lighter power always on?

Old 08-22-2009, 02:38 AM
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Cigarette lighter power always on?

I plan on using the cigarette lighter/dc power. Is this always powered even when the key is off or out? Is there a way to switch it so it's always on?
Old 08-22-2009, 07:40 PM
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my wife wild, but she loves every minute of it.
Originally Posted by trioxin
I plan on using the cigarette lighter/dc power. Is this always powered even when the key is off or out? Is there a way to switch it so it's always on?
It's switched. Consider direct wiring if you need "always on" power. BTW, what are you connecting?
Old 08-23-2009, 02:21 AM
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2015 GLK 250 BT
Power to be always on (cig lighter)

Awhile back, there was a posting on setting up the cig lighter to be always on, as follows;

If you move the fuses for the 2 power sockets (cig lighter) on the engine compartment, you can make them key-switched or always on. I have the front one switched and the rear one on. Open the fuse block under the hood, and there will be 2 fuses for the cig lighter....I think they are 53-54, they are the only ones with 2 locations. Viewing your car from front to rear, they are located on the left hand side, 2 back from the closest part to the windshield . You take it out and place it on the right for always on or on the left for switched.
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Old 08-24-2009, 07:34 PM
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Excellent, good info: better than speculation
Old 08-24-2009, 11:37 PM
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Many thanks to Konigstiger

OK, this fuse block is located under the hood, driver's side, up against the firewall. Undo the flat protective cover, and you'll see the protective cover for the fuse block. Push toward the rear - the 2 sliding locks and lift the cover off to reveal the fuses.

Last edited by SPNJHockey; 08-24-2009 at 11:41 PM.
Old 08-24-2009, 11:45 PM
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07 E350 4Matic / Sport with P1
Originally Posted by seahonu
...I have the front one switched and the rear one on...
Cuz, any idea which fuse belongs to each of the lighters? AND...

Does anyone know if charging a cell phone would kill the battery if the car's not running?
Old 08-25-2009, 11:10 AM
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Excellent information! I have left my cell chargers plugged in my vehicles 24/7 for years with no ill effects. It's always irritated me that the Mercedes was switched instead of always-on (typically the only time my phone gets charged is when I leave it in my vehicle)....will certainly take care of that tonight thanks to this thread!

Thanks for the info.
Old 08-25-2009, 06:09 PM
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Useful info, I always wondered why my power outlet wouldn't stay on like in my Yukon. On my '07 Bluetec, the the back fuse (I'm assuming that is the back power outlet) was already to the right, and it is not on w/o the ignition on. Swapped the front one to the right and it turned the ashtray p/o into always on. Nothing in the owners manual about that!
Old 08-26-2009, 01:39 AM
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Great info...I just turned the front one to always on (Fuse #54 to the right) but the rear on doesn't work. Any ideas on the rear one?
Old 08-26-2009, 07:22 AM
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07 E350 4Matic / Sport with P1
Originally Posted by flossinlo05
Great info...I just turned the front one to always on (Fuse #54 to the right) but the rear on doesn't work. Any ideas on the rear one?
Swap the two fuses and see what the results are.
Old 08-28-2009, 01:46 PM
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2018 E400 4matic Wagon
So, is the default setting switched for front ashtray cig lighter and always on for rear of console power outlet? It seems to me, you'd want the reverse so that if a child leaves something plugged in to the rear outlet.
Old 08-28-2009, 10:15 PM
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07 E350 4Matic / Sport with P1
Originally Posted by Oggie (on L.I.)
So, is the default setting switched for front ashtray cig lighter and always on for rear of console power outlet? It seems to me, you'd want the reverse so that if a child leaves something plugged in to the rear outlet.

Default setting for my '07 was both lighters off when car is switched off.
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Old 08-29-2009, 01:11 PM
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So I checked this post a day or so after I originally posted.. and no repsonse... took my car to the local car stereo store in town and had them do this... charged me $100 to switch to always on... then I come back now and see all this activity on the post... oh well.. wish I wouldn't have been in such a hurry.

Although I did have them run my XM antenna and add two cig light adapters behind the ash tray.. I pulled the ash tray insert out .. drilled a small hole through and now have my XM in the ash tray.... works perfectly and best part is it's hidden.

Either way .. thanks for the info. Good to know.
Old 08-30-2009, 12:07 AM
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2018 E400 4matic Wagon
Originally Posted by trioxin
I did have them run my XM antenna and add two cig light adapters behind the ash tray.. I pulled the ash tray insert out .. drilled a small hole through and now have my XM in the ash tray.... works perfectly and best part is it's hidden.
Did they mount the cig light adapters to something in there or are they just loose? Also, do you know about the small rubber mat you can get for the compartment to use when you've removed the ash tray? Check the thread I started around April 2008 about that. You'll see the part no and picture.
Old 08-30-2009, 06:29 PM
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they are loose back there.. but they are both being used.. one for my xm and the other a power adapter for my palm pre phone. Took some work getting everything tucked in here and there so the ash tray would fit back in. I did get it finally and everything seems great so far.
Not sure what your talking about as as far as the mat but I'll check the post.
THanks.
Old 09-09-2009, 01:06 PM
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2018 E400 4matic Wagon
Originally Posted by trioxin
Not sure what your talking about as as far as the mat but I'll check the post.
THanks.
Here's the original post on the mat that you can put in the compartment when you remove the ash tray.

https://mbworld.org/forums/e-class-w...erior-mod.html
Old 09-09-2009, 01:10 PM
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2018 E400 4matic Wagon
Originally Posted by SPNJHockey
OK, this fuse block is located under the hood, driver's side, up against the firewall. Undo the flat protective cover, and you'll see the protective cover for the fuse block. Push toward the rear - the 2 sliding locks and lift the cover off to reveal the fuses.
Well, it must be different on a wagon (2008) because there's no fuse box in the engine compartment at all. I checked the manual and it indicates that the fuse box is on the left end of the dash, accessible when the driver's door is open by prying a plastic panel off. I tried removing the panel, and it wouldn't budge, so I gave up rather than break it. Has anyone removed this panel on a wagon?
Old 09-09-2009, 04:04 PM
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Originally Posted by Oggie (on L.I.)
Well, it must be different on a wagon (2008) because there's no fuse box in the engine compartment at all. I checked the manual and it indicates that the fuse box is on the left end of the dash, accessible when the driver's door is open by prying a plastic panel off. I tried removing the panel, and it wouldn't budge, so I gave up rather than break it. Has anyone removed this panel on a wagon?
Front SAM incorporating fuse and relay module is located in the engine compartment, driver-side by firewall.
Old 09-09-2009, 11:19 PM
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lexus sc400 and VW Jetta 1.8t
Welcome to most German cars dude... My Jetta does that and my bmw did it when I had it....
Old 09-09-2009, 11:49 PM
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07 E350 4Matic / Sport with P1


Fuse location 153b didn't affect the rear seat lighter.
I changed 154b to what is depicted above, and now the front lighter is "always on."
Old 09-09-2009, 11:51 PM
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07 E350 4Matic / Sport with P1
Thumbs up

And, again...thanx to KonigsTiger for posting the original graphic of the fuse block.
Old 09-10-2009, 08:15 PM
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2018 E400 4matic Wagon
Originally Posted by konigstiger
Front SAM incorporating fuse and relay module is located in the engine compartment, driver-side by firewall.
You're right! It was so far back, and hidden among so much black plastic that I didn't notice it the first time. I did it and it works just as you said. The front socket is now always on, and the rear is on with ignition as before. What a great mod. Thanks Konigstiger and SPNJHockey. This is the best mod I can think of that requires no tools and no expense.

Last edited by Long Islander; 09-10-2009 at 08:28 PM.
Old 09-10-2009, 11:54 PM
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07 E350 4Matic / Sport with P1
Originally Posted by Oggie (on L.I.)
You're right! It was so far back, and hidden among so much black plastic that I didn't notice it the first time. I did it and it works just as you said. The front socket is now always on, and the rear is on with ignition as before. What a great mod. Thanks Konigstiger and SPNJHockey. This is the best mod I can think of that requires no tools and no expense.
Now, try running your ipod wire from the glovebox into the dash, behind the ashtray, under the shifter cover and into your center arm rest!

As for Konigstiger:
Old 09-11-2009, 01:30 PM
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2018 E400 4matic Wagon
Originally Posted by SPNJHockey
Now, try running your ipod wire from the glovebox into the dash, behind the ashtray, under the shifter cover and into your center arm rest!
If the ipod is already in the glove compartment, not bothering anyone, why would I want to put it in the center console (which is small to begin with)?
Old 09-12-2009, 12:01 AM
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07 E350 4Matic / Sport with P1
Originally Posted by Oggie (on L.I.)
If the ipod is already in the glove compartment, not bothering anyone, why would I want to put it in the center console (which is small to begin with)?
I only suggested it tongue in cheek. However, I used to have my connecting wire plugged in, with glovebox closed - and wire coming out of the side (real cheesy) extending to the center arm rest area. I did this so that I could actually use the ipod while I was driving. I routed the wire like I said in my earlier post so that my wife wouldn't be catching her foot or bag on the wire, and I would not tempt any miscreants when the car was parked somewhere.

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