To be clear it is simply replacing the auxiliary battery rather than fixing it. The position is the same for C class and E class and if you are in the UK it is in the same place but on the other side. They seem to last about 6-7 years. They car seems to reset itself OK and you can do it all while it is live (but not running of course!) This is a nice clear demo of how to get to the part.
Hi Willard, thanks for saving me £170 plus vat! However, when you remove the panel beneath the glove compartment (2.06 in) you say it just snaps off. I have a 2017 W213 and there is one screw in the underside closest to the door. Word of warning to anyone else. Check for screws people! Thanks again for a very clear instructional video. I did it in 20 mins!
The video makes it look easy…But wait! There’s more to it. Getting to the auxiliary voltage regulator is not easy for a novice. The carpet is molded with a rigid foam backing and it is not easy to get out of the way. Then when the new part is replaced the electrical system is interrupted and a new code appears on the dashboard. The auxiliary malfunction code goes away but a new code appeared. I thought I would have to take the car in to a Mercedes shop to get the new electrical code erased, however after driving a few miles the “start engine/see operator’s manual” code went away. What an adventure. I guess the money saved makes it worthwhile.
Thank you so much for making this video, lovely clear instructions. I am definately not a car mechanic and I have managed to find and replace my converter, so thank you for your help.
