![Mercedes-Benz W211 Auxiliary Battery Replacement (2003-2009) E320, E500, E55 | Pelican Parts DIY Maintenance Article Mercedes-Benz W211 Auxiliary Battery Replacement (2003-2009) E320, E500, E55 | Pelican Parts DIY Maintenance Article](https://cdn4.pelicanparts.com/techarticles/Mercedes-W211/71-BASICS-Auxiliary_Battery_Replacement/images_large/pic05.jpg)
Mercedes-Benz W211 Auxiliary Battery Replacement (2003-2009) E320, E500, E55 | Pelican Parts DIY Maintenance Article
![Auxiliary battery malfunction - can anyone shed some light on this and what they've done in this situation? Everything works incl. stop start etc…GLC250d, 2015 : r/mercedes_benz Auxiliary battery malfunction - can anyone shed some light on this and what they've done in this situation? Everything works incl. stop start etc…GLC250d, 2015 : r/mercedes_benz](https://i.redd.it/10m2w3jw9ht91.jpg)
Auxiliary battery malfunction - can anyone shed some light on this and what they've done in this situation? Everything works incl. stop start etc…GLC250d, 2015 : r/mercedes_benz
![I'm getting a "Aux. battery malfunction" message on my instrument panel. I'm not having any luck locating the Aux. I'm getting a "Aux. battery malfunction" message on my instrument panel. I'm not having any luck locating the Aux.](https://f01.justanswer.com/73bbchevy/de3c8b72-a56c-41fa-8a67-0dd56b6d3c60_aux+battery+location+1.png)