EVOII_Racer

Hi MB fans,

I got that message this morning while I was starting to drive like Hamilton with my ml63 and switching from Confort to S+

The message: ''Auxiliary battery malfunction'' apperared when I pressed the suspension switch...

What is it exactly?

Thanks so much in advance.

MLee

Auxiliary battery probably has low voltage or the control device that connects it may be faulty.
Electrical items like power windows etc run off the rear battery.

Nanook

Evo would you know the location of this battery ? I know the main is under the passenger seat but I'm curious where this unit is located..

MLee

Right hand rear corner. Below the tail light.......well hidden and difficult to see. Remove a couple of trims for "limited" access.

Nanook

tks..now I know

EVOII_Racer

Does anybody know if I can I drive my ML to Germany or I need to fix it before? (about 300miles)

Thanks

another_geek

You can drive normally without the aux battery. Mine went out in Jan and I drove for a week before I had time to take it to the dealer. Battery had shorted out and was replaced under warranty.

Not sure exactly what the aux battery is used for but all functions worked normally (windows, etc.)

MLee

If the main battery voltage drops below a set figure, the battery control module connects the auxiliary battery to make sure engine crank over for start......aux bat not normally connected for starting.

swatty

Same thing happened to me when my ML was 6 months old, you can drive it ok . Added bonus, Eco function stopped working