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Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 54035
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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2011 MZB ML 350 Warring & ABS light on, Was told by dealer

Customer Question

2011 MZB ML 350 Warring & ABS light on, Was told by dealer about 2 months ago that the main & Auz battery's should be replaced. Now we have the lights on and it seems the auto headlight setting is not working properly, when in Auto, the headlights on always On. Do you thin the Batteries are the cause
JA: Have you checked the fuses? Have you checked the bulbs?
Customer: I have not checked the fuses, where are they located
JA: What is the model of your '11 Mercedes?
Customer: ML 350
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Yes, but haven't tried anything yet
JA: Anything else you think the mechanic should know?
Customer: Not sure, but the passenger window isn't operating correctly also
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Mercedes Mechanic about your situation and then connect you two.
Submitted: 1 year ago.
Category: Mercedes
Expert:  Marty replied 1 year ago.

Hi, low battery voltage will cause the warning lights to come on and can also cause the auto lights to default to on all the time. I would replace the batteries and have the fault codes erased in all of the vehicle modules then have a basic reset performed on the electrical system. This will not be a fuse problem.

Let me know if you have any questions.