What Is Auxiliary Battery Malfunction C300. Most 2003 and newer Mercedes-Benz have a secondary battery also known as an auxiliary battery. This opens in a new window.
Hello I hope someone can help. Mercedes E-Class W211 S211 W212 S212 C207 A207 ML W166 GL X166 Mercedes C-Class W204 S204 Mercedes S-Class W220 W221 Mercedes A-Class W176 W177 CLA W117 CLS W218 C257 Mercedes Sprinters W906 Vito W639 W447. I parked for about 30 minutes and when I started the car again I got an Auxiliary Battery Malfunction warning.
The auxiliary battery is located under the cabin air filter housing.
50 out of 5 stars 3. This is my first Mercedes and I am constantly learning about new ways to engineer automobiles. Remove the plastic bolt that holds the cabin air filter in place then lift up the cabin air filter housing to access the auxiliary battery. The main battery is for starting only.
