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Dashboard hazard lights

Tiny
JOEPLUS
  • MEMBER
  • 2011 MERCEDES BENZ 300
  • 54,000 MILES
I was driving my car and all the dashboard hazard warning lights have come on and wont go off.
Sunday, June 12th, 2016 AT 6:25 AM

5 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
All of the warning lights or certain specific lights? If you have multiple system failures, the first suspect is a failed charging system. Measure the battery voltage with the engine running. It must be between 13.75 and 14.75 volts. If it is low, have the charging system tested by your mechanic.

With low system voltage, many of the computers will not work properly. Knowing that, they will shut down, and turn on their warning light to tell you.
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Sunday, June 12th, 2016 AT 2:46 PM
Tiny
JOEPLUS
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After I got home I shut the car off, when I tried to restart it is was like I had a dead battery but now it is starting but all the hazard lights are still flashing and steering wheel buttons don't work and it's like the warnings keep going on and some go off.
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Sunday, June 12th, 2016 AT 3:53 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
Without being able to see it for myself to know exactly which lights are involved, my best recommendation is still to check the charging system and battery voltage. Steering wheel controls involve computers so it's anyone's guess what will stop working with low system voltage.

Also follow the smaller positive battery wire to where it bolts to the under-hood fuse box. Be sure that connection is clean and tight.
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Sunday, June 12th, 2016 AT 4:13 PM
Tiny
JOEPLUS
  • MEMBER
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Thank you
ya now sometimes it starts and sometimes it doesnt its sunday I will get a new battery tomorrow its the battery the car cam with its like 6 years old. I will ask them to test it first again thank you
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Sunday, June 12th, 2016 AT 4:19 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
The battery isn't causing this. It could indeed be bad but it sounds more like a charging system problem. Measure the battery's voltage with the engine off first. If it's good and fully-charged, it will read 12.6 volts. 12.2 volts means it's good but discharged. 11 volts or lower means it has a shorted cell and must be replaced.

Once the engine is running, you must find battery voltage of 13.75 to 14.75 volts.
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Sunday, June 12th, 2016 AT 4:26 PM

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