A-Class Hazard Warning lights won't turn off

A J Cox

New Member
Joined
Jul 6, 2017
Messages
1
Car
A-Class
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
 

Flyinspanner

MB Enthusiast
Joined
Oct 1, 2015
Messages
1,897
Location
Ruislip
Car
A209 320CLK (CL500 & W168 sold)
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.
 

Torycutkills

New Member
Joined
Feb 24, 2021
Messages
1
Location
Nottingham
Car
Mercedes benz a class
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.
Brilliant thanks your comment saved me a lot 😊
 

KillerHERTZ

Administrator
Staff member
Joined
May 21, 2003
Messages
17,853
Location
Cambs
Car
CLS63 AMG
Its a battery inside the wheel well, you can charge it up as per above, however it sounds like its on its way out and will start happening again.
 

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