Batteries disconnect/reconnect CLS55 AMG

[andy27168]

Hi,
Going to be doing some electrical work on my CLS 55 AMG at some point in the next few days and will need to disconnect both batteries.
I'm sure I read somewhere there is a specific method of doing this, eg rear battery first then the front battery, and then the opposite when reconnecting.
Could anyone tell me what the process is? It will be greatly appreciated.
Also is there anything I need to be aware of eg COMMAND code etc. though my understanding is there isn't one but a google search I found someone mentioning it in a forum post somewhere though the person did seem a touch ill informed but it doesn't hurt to seek confirmation.
Cheers

 

[b1g1an]

You only need to disconnect the rear battery unless you're doing something specifically related to the little one.

Only thing to do on reconnection is reset the windows, all the way down, keep the button pressed and count to five, then all the way up and another five.