A-Class Hazard Warning lights won't turn off

Discussion in 'Electronics' started by A J Cox, Jul 6, 2017.

  1. A J Cox

    A J Cox New Member

    Jul 6, 2017
    Hi members,

    I'm hoping this is a quick fix.

    The battery on my A-Class was flat this morning and when I started the car using battery leads the hazard warning lights came on and stayed on.

    If I disconnect the battery then reconnect it they do go off. But come back on one again as soon as I turn on the ignition.

    Is this because my battery is very low?

    I'm going to put it on charge overnight but would love some advice.

    Best wishes, Alastair
  2. Flyinspanner

    Flyinspanner Hardcore MB Enthusiast

    Oct 1, 2015
    W215 CL500, W168 A-140.
    It could be something to do with the alarm system, once you charge the battery, reconnect, then shut the doors and cycle the locks with your key fob. That may get them to go off.

    If they come on again and/or the alarm siren, it may be the battery in the alarm system is very low/old. I think there are some threads on alarm issues.

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