rbourge

Where is the 12 volt battery located and is there a way to open the hood in the EQS? I just took delivery on my EQS 580 that I ordered in July and there are a lot of things to figure out on this car. I find the owner's manual be bit confusing on some things plus there are a few errors. For example, the navigation satellite view setting is in the EQ tab not in the navigation panel 2D/3D tab contrary to the manual.

svp6

There is a latch - see the EQC video on opening the hood (second on the page) and a demo on EQC at the 9 min mark (first video on the page) here. You are not supposed to though.

rbourge

Thanks, but is the 12 V battery under the hood?

c4004matic

Opening the hood is very simple. There is a silly little tab where the usual hood opening lever is. Just pry it open, and the lever is there. I don't know where the 12v battery is, but from the pics I've seen, it doesn't appear to be there. The reason they don't want people opening the hood is liability. Under the hood, there are live 400V components. If you stick a screw driver in the wrong spot, there is a very real potential for electrocution. The only thing that could be user serviceable is adding coolant for the battery pack (2 reservoirs). As is routine for Mercedes, the owners manual is CRAP. Writen by lawyers rather than by the engineers who actually designed the car.Personally, I attempt to read the entire manual; however, since they are horrible, I just sit in the cabin a few afternoons and do some intensive practical "education" by going through the entire system.

Old Dawg

Yes, the 12 volt battery is under the hood.

c4004matic

Then, that makes 2 possible user maintainable items😁BTW if the 12V battery is out, the car is out of commission.Knowing where it is is crucial to know since my dealer is 90 miles away!

rbourge

I just opened the hood on my 580 but don't see anything that resembles a usual 12V car battery. There are some oddly labeled tanks of liquid that can be filled with something and several heat sinked electronic modules but can someone point out where the 12v battery is located?
Interesting to look at for automobile contents none the less.

Old Dawg

I can't speak to the 580 but on my 450+ the 12v battery is located at the rear of the hood opening, passenger side close to what we would have called the fire wall. It was very easy to spot as is the positive jump point. (big red square).
As to the tanks of liquid, I first though it was the washer fluid, but there is just too much of it. Then I read somewhere that it is coolant for the high voltage batteries.

c4004matic

I don't know where the battery is. On the left rear, there is a covered positive terminal, which I take is the 12V jumping terminal.

Diesel Benz

Location of EQS 12 V batteries (10 main, 210 backup):

c4004matic

[QUOTE=Diesel Benz;8516435]Location of EQS 12 V batteries (10 main, 210 backup): [/QUOTEThanks! Is the rear 12v too?

Diesel Benz

The rear 12V battery is unlikely to appear in the car, comes with options 200, 503 and 4B2.

MBDrifter

Since you have the 580 it comes with the HEPA filter package yes? In this case to get to the 12V you would have to take all of the plastic coverings off. Be sure to note where the different covering overlap or you may forget how to put it back together.

c4004matic

There is no reason to uncover anything unless the battery needs replacement. The jumping connectors are in plain view.

c4004matic

Good point! However, there is one situation where you may want to disconect it.... To boot the entire system. Last option before calling for a tow......

drmanny3

Yes, you are correct. Several times in my BEV vehicles or Plugin vehicles I have had to reset the system. By disconnecting the battery you force the system to reboot.

Diesel Benz

Is that for Mercedes cars? The majority of control units are reset anyway by switching power off and waiting some 20 minutes. The ones that have continuous power supply should preferably be reset by pulling a fuse rather than disconnecting the battery. Of course even this should not be necessary (SW bugs should be and I'm aware of a few very rare cases where the "battery reset" is needed and is the only option. Could you give a list of issues (control units) based on your experience?

drmanny3

No, I do not have experience with Mercedes Cars. My experience comes from owning 4 other BEV cars, two Plugins, and 4 Hybrids. Our 2020 Tesla has on a couple of situations locked up. Tesla defines a soft reboot. However that does not always work. There is a hack known to go more deeply. You change the size of the wheels which effects many things in the car and that forces a deeper reboot. Thus far that has worked. The 12 volt battery is behind a bunch of stuff inside the front trunk. That would be the last resort. On my 2017 Acura NSX Hybrid sports car, I experienced the gas gauge not reading accurately. By disconnecting the battery the system had to reboot and everything reset. There was no soft reboot that I was aware of. On my 2017 Volvo XC90 T8 plugin the navigation system lost itself thinking we were in NewYork rather then in California. Disconnecting the 12 volt battery forced a reboot and fixed the issue. My 2017 Chevy Bolt had a locked screen. Disconnecting the battery forced a reboot and fixed the problem. I suspect it is not unlike a desktop/laptop computer where sometimes you are forced to reboot to clear the system. This is becoming less of an issue as systems get better. It should not be the go to when ever something is not right. Mercedes obviously closed the hood to keep people out who do not know what they are doing. 400 volts plus and high amperage can kill you. There are some of us who want to know and love to tinker. Having said that, forcing your computer off can sometimes corrupt the operating system, so one must be careful.

Diesel Benz

Mercedes too has a reboot option for the MBUX part (which is a bit like a computer) and if it boots, there is an option to revert to full factory settings (as a last resort).

drmanny3

Good to know.
Thanks