yt4o

Hello guys,

I need your help I want to retrofit cigarette lighter in trunk of my E350 CDI - 2009, because the european model not have such.
The first thing that immediately occurred to me was to find out fuse of the existing cigarette lighter in rear SAM module,
to put a wire on it for positive and another wire on chasis for negative.. and these 2 wires to the new cigarette lighter plug.
I search for some fuse diagrams and found that fuse # 71 is for interior light and fron cigarette lighter.
My question is: is this idea good?
I am afraid that if there is consumption of the new cigarette lighter or I confuse something with these direct cables from the fuse,
the rear SAM module will not fall asleep (sleep mode) when car is turn off in parking or I will confuse the ECU in some way
Please share your knowledge and tell me how to put cigarette lighter in my trunk without interfering with the current car ECU/electronics.

Thanks in advice

Example how to get positive wire from fuse:

yt4o

Anyone? up

hyperion667

If you're so obsessed with smoking that you need a lighter in the trunk you may have more pressing issues than trying to put one in your trunk

badbenz94

Could be he wants to use it to plug in his phone or something when he is stopped and sitting on his bumper taking a break

Chris

pierrejoliat

I use mine for small portable air compressor, much easier than hauling an 95 pound one up from the basement,

KEY08

I figured it was to plug a device(s) into.

SEC1939

If your battery is in the trunk then it's really easy. A direct wore with a fuse.

yt4o

no i'm not have a battery on the trunk, but i have Rrear SAM module with a lot of fuses

pierrejoliat

OK, so here's were the stock one is located, mine has a wiring harness that seems to come from the taillight area? but the fuse panel and ground for panel are accessible, so maybe tap there? Sorry about the focus on the second picture, but the boss left as I was taking the picture and my daughter borrowed my car this morning, so I can't retake until someone comes home! Maybe your car has the wiring harness?

KEY08

@pierrejoliat but the boss left….

ha! Ain’t that the truth. I have one too. 😂

pierrejoliat

Why are you in the trunk?
What are you doing?
Where's my purse? {Kept in trunk}
Can I leave now?
Why are you taking pictures of the fuse box?
Where's your car?
Is something broken?
Did you put it all back together?
Did you move my seat back?
Love!

yt4o

Can you tell me is it okay to get voltage from fuse # 71 and is this will affect the sleep mode of the rear SAM module/ECU ? Is it a safe practice to take voltage from a fuse at overall?

pierrejoliat

OK, my car's home, 12 volt outlet wires are red and brown in the black wrap vertically on right side of picture, this is my '12 with this square SS bracket? Not in my '13 .I swear every time I look there's something different about each car. if you don't have the wire after removing both panels and searching, why couldn't you just put a new fuse into the magenta or yellow fuse block?

yt4o

Anyone that familar with car instalations and modules/ECU to say is it safe and ok to get positive voltage from the fuse?

DFWdude

I understand your being cautious...

I don't qualify as a stereo installer (sic), but I have added supplemental wiring to the rear fuse box several times without problems. As pierrejoliat has noted, simply add a fuse/tap to the rear fuse box for power to the new outlet, and ground it back to the common ground in the fusebox.

It might be good to identify the normal fuse # location and voltage for a rear outlet (that I know you don't have) on the (generic) fuse chart and add the new fuse of the specified voltage to that slot. On my car, it's slot #72 for "rear socket". So, if your chart says #71 for rear socket, you should be ok to proceed with it, as it should be a switched power slot (on when the car is running only). HTH.

kajtek1

I don't see any problem with running new fuse from electrical panel in the trunk. Most of them have slots available, what would make quite easy job.
I would run 20 amp fuse/wire for it as with potential compressor use, the 15 amp might blow when you restart compressor under load.
Another question is if you want the outlet ignition -controlled, or permanently on?

yt4o

Hi, i need controlled cigarette lighter and i plan to take positive voltage wire from on of the fuses, like # 71 whos called "Interior light and front panel cigarette lighter" or another one whos called "Rear panel cigarette lighter"

S-Prihadi

It is safer to take F72, as long as your rear SAM has the Relay G.
F72 is Cargo area socket (X58/4) and is the only load on Relay G.

If you use F71 Front cigarette lighter with ashtray illumination (R3), that is from Relay B.
Relay B not only supply to F71, but also :
F37 Driver seat NECK-PRO head restraint solenoid (Y24/12)
F83 Circuit 15R connector sleeve (Z3/12)
or Navigation processor (N41/1) <<< China cars
or Emergency call system control unit (N123/4)
or Electronic Toll Collection control unit (A50/3) <<< JAPAN

NOT using F71, will save the relay B contact life for more important fuses it serves.











F72 is from Relay G and is after all for a Cargo area socket



Since F72 or F71 is relay operated and rear SAM logic is controlling it, it can be time-out ( OFF ) according to rear SAM strategy. I am not super familiar with rear SAM time out strategy per relay it controls.
Othe thing for sure, Relay B and G is from 30g circuit, which means they are controlled by K2 big relay at engine bay F32 PreFuse housing. In sleep mode of the car computer/s, K2 will disengage ( Sleep/OFF /Open Circuit).
However the time for K2 to sleep is very dynamic. If you made a drive for X minutes, K2 may take hours to sleep.
If your car is parked for a few days and you open the door and K2 wakes up, it can sleep again under 30 minutes.

Have fun............

yt4o

S-Prihadi tank you very much for the comprehensive answer, this is the answer i seeking for! I check my fuse box and i saw that i have fuse 71 and 72, but not 72 and its normal. The good news is that i have relay G installed. Here is my fuses:

Ok for now, but when i check with multimeter, there is no voltage with/without engine on Here is how i check it:

So where i misstake?

S-Prihadi

You read at the LOAD side and without a fuse, you wont read anything.
You must read on the SUPPLY /SOURCE side.

See below :



Test your Tap-A-Fuse and make sure it is the same internal wiring route as below :


You do not need to put a suposedly original F72 fuse, keep it empty.



I am assuming your Tap-A-Fuse is the same internal wire routing as sample I speak of.

SUPPLY = SOURCE




Test it and let us know

yt4o

Thank you very much S-Prihadi I learn a lot today! I order some Tap-A-Fuse's and 15A fuses and wait them to arrive. Will write again when all is wired and installed

S-Prihadi

U are most welcome my man.

While you are at the Rear SAM, I shall show you another neat trick.

01. Those fuses labeled with white tape and stated for its amperage, are spare fuses. So easy to keep it there.

02. Those spare fuses will occupy empty un-used fuse slot, which believe it or not, when you are in the dark and hard to read the black fuse number print on rear SAM,
or in a bad mood due to fuse blown while on the road, or not paying attention and whatever.......
there are times you actually plug in the correct new fuse into a wrong slot. This happens to even seasoned mechanics and they ended up loosing hours trying to track down lost voltage.
By having the white tape label on the spare fuse, you know that is a spare fuse and those fuse slots are not used in your car.





The green row is easy to remember, because two fuses starts from very left and 2nd one next to it. No empty spaces in between like White, Red and Yellow row.


Yes, I use blue tape and some plastic cut out to cover RELAYS I do not have and MAXI FUSE I do not have and any other empty fuse slot I hate seeing naked-empty.

Have fun.....

S-Prihadi

yT40,

Relay G also serve Fuse 76, I missed that sorry Bro.
This is one problem with MB wiring diagram of Front and Rear SAM, both in 10 sheets. To find 1 fuse or relay, you must see all 10 sheets separately because they can be placed it in 2 or more pages/sheet......damn.

212.1 model I don't know what W212 model that is.


On my car a 212.065 , I have this F76 fuse and I believe it is for my rear entertainment system , 2 TVs at front seats backside and 1 DVD/CD player at the rear seat azz-cushion.
I have not tested F76 by removing it yet though.
This just to show that MB fuse list is not updated enough for my facelift E400 / W212.065
I don't really trust a 100% MB W212 Rear SAM fuse list, because sometime they may miss newer models , the facelift ones.

Please verify your Fuse 76

S-Prihadi

I am attaching a JPEG version of rear SAM diagram for fast fuse and relay search. No legend, only schematic. So you can search on your own RELAY TO FUSE TREE

Your quest made me started my Rear SAM fuse + relay cataloging again... LOL.
I completed Front SAM long time ago but stop 1/4 way for Rear SAM. Its a lot of work and take days to create my own guide book for these SAMS.

NOTE : US cars get printed/custom fuse list. Do you get one for front and rear SAMs ? My market version : zero-NIL-nada such luxury....

sweetnsassy

I needed one to connect my dedicated battery for a 2CH dashcam. I wish I could trade my ashtray for a 2nd 12V socket or for my car vaccum to clean the trunk after I transport a dead body of someone who smoked in my car.
But hey, MB needs that savings, I guess