Waching daily Oct 29 2018

ladies and gentlemen Keith from iRepair Autos today I'm gonna show you how to

change on that main battery on your Mercedes vehicle not to be confused with

the auxiliary battery main batteries normally found under the seat whether it

be the front passenger seat sometimes also in the trunk

very rarely under the hood these days and I'm gonna show you how to do that

without losing any of your settings like your radio cool your windows presets or

anything like that so let's get started well before we get started I know you've

been meaning to subscribe do that now Thanks

bring the behringer seat all the way to the front so you're gonna remove the

cover exposing the battery compartment also you can bring this tarp it up and

lifting there's a little tab right here where my fingers is pop that tag up and

you can then pull out this vent port what we're gonna do is we're gonna pull

this tab up and so once all of that has been removed putting the seat backwards

you know all the way back as far back as possible then you're gonna raise the

seat up once the seat is raised up next we'll bring the carpet forward and that

will give us better access to the battery compartment below then we're

gonna bring the seat forward once more then we're gonna close the phone all

right ladies and gentlemen at this point you're gonna remove your key from the

ignition or the starter switch if you have a vehicle that has no ignition

switch but a push to start button listen very carefully you have to make

sure that your vehicle's onboard electronics have a status zero that

means you turn off the engine all electrical systems read your air

condition or everything like that is off using the keyless go start/stop button

once you have done that you must open the driver's door and with the driver's

door open the vehicle onboard electronics have a status of zero that

means they're completely off you do that for both the

ignition with the key and and without the key

you leave that front driver's door open all right must leave it open that will

ensure that all systems are basically off so you think I can millimeter socket

so now I'm gonna go ahead and I'm going to remove the or disconnect the battery

negative lead and the negative lead is right there with the brown wire once

that's loosened up then I'm gonna go ahead and remove that then we're gonna

reach in and we're gonna remove the positive terminal then using the same

ten millimeter bolt we're gonna reach in there and we're gonna disconnect or

loosen that connection point right there

okay so that's disconnected now we're gonna remove the battery ventilation

tube and the battery ventilation tube is right here we're gonna pull it out of

the battery move that off to the side so that we can reconnect it when the time

comes so using a 13 millimeter socket

the first one grab the second one that's one this is the battery mount bracket

keeps the battery in position so that it doesn't bounce around so I'm using a

needle nose pliers

to bring up and out the battery mount with the two nuts and I put that in a

safe place

now in my opinion the most important part of this job is connecting back the

rebreather hose this is a safety concern leads to the health of the passengers

and it allows all the poisonous gases to escape outside the vehicle when the

battery is being charged and to connect it back you have to know what to connect

it to we're going to connect it to that port right there

all right so there it is it's connected down and out of the vehicle

so those gases can leave now down

just like before make sure that that connection that rebreather hose didn't

come loose and the positive battery disconnected these are the batteries

back in its rightful area when connecting the mounting bracket there's

a lip on this side there's no lip on that side so you want this lip to be

towards the battery so we're gonna just reach in there

and with my luck listen to keep the battery in place such that it doesn't

move around tube remember that connect it right here where we unplugged it now

we're going to connect the positive lead

once you've rotated the battery post go ahead and cover it

we're gonna connect the negative post I don't want to keep dangling it or

touching it up and down connection like that the protection cover that's what

that's called protection cover next thing we're going to connect is the air

channel air channel to responsible any conditioning once you've connected to

them to the mating receive an end then this plastic cap goes back into this

hole right here

alright then we're gonna take this carpet here and then down under this

stuff right here so I'll just do that

vent cover back in place and there you go at this point you'll come back

through the front driver's side door put your key in the ignition put it to

position two and all of your electronics should come back you should not need a

radio code if you find these videos helpful