The document discusses an "Auxiliary Battery Malfunction" message that may appear in some Mercedes vehicles. It explains that Mercedes vehicles have an auxiliary battery that powers components like the radio, GPS, and blind spot assist. The most common reason for the error message is a weak or dying auxiliary battery. Other potential causes include failure of the voltage regulator, a bad primary battery, or an electrical short circuit. The document advises that if a Mercedes displays this message, the auxiliary battery should be checked soon after to diagnose the problem.

1. What Does It Mean
When My Mercedes
Says Auxiliary
Battery
Malfunction?

2. The appearance of the
"Auxiliary Battery
Malfunction" message
simply means:-
"Go get your Mercedes
auxiliary battery checked
- it's probably dying".

3. What’s an auxiliary
battery, you asked?

4. Well, that’s what we will discuss
next.

5. A Short Note On
Mercedes’s Auxiliary
Battery

6. In a nutshell, an auxiliary
battery is a backup for the
main battery.

7. It essentially powers the
following parts:-
Radio
Blind spot assist
Lane keep assist
GPS
PDC

8. Let's move on to the
reasons why the
"Auxiliary Battery
Malfunction" message
may appear.

9. Dying or weak
auxiliary battery

10. The most common
reason the “Auxiliary
Battery Malfunction”
message will appear:-
“is due to a weak or
dying auxiliary
battery”.

11. So, check the auxiliary
battery soon after you
see an error message
like this.

12. Failure of the voltage
regulator

13. This may also activate the
“Auxiliary Battery
Malfunction” message in
Mercedes.

14. Also, a faulty voltage
regulator can damage
the main battery.

15. So, make sure that the
voltage regulator of your
Mercedes is in good
working order.

16. Bad primary battery

17. It’s the primary battery that
supplies electricity to:-
The ignition system
Starter motor
And, other crucial electrical
appliances

18. And, yes… If it goes bad,
your Mercedes will
display “Auxiliary
Battery Malfunction”.

19. Electric short circuit

20. Short circuits can cause
irreversible damage to a
car’s electrical system.

21. If your Mercedes has an
electric short circuit, it
may show an "Auxiliary
Battery Malfunction"
message.

22. Final Thought

23. If your Mercedes displays
an "Auxiliary Battery
Malfunction" message,
don't look away.

24. Find out what triggered an error
message like this.

25. BAY DIAGNOSTIC
https://www.baydiagnostic.com/
/BayDiagnostic/