bulb warning light coming on but bulbs seem to be fine!!!

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rowy - 05 Jul 2005 20:37 GMT

Hi - I have a P reg. c180 estate and the bulb warning light has came
on. it seems to come on when i hit the brakes. I have checked the
brake lights and they are coming on and so is the high level break
light. I have also checked all of the other lights and they seem to be
working fine. Can anyone advise what they think might be the problem?

thanks :( :(

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Josh - 05 Jul 2005 22:47 GMT

They may seem fine to the naked eye, but it's possible that the resistance
in one bulb is out of spec. Sometimes if it is dark and you have a friend
press the brake pedal you might see that one bulb is just slightly brighter
than the other. Regardless, it's pretty simple to get a couple of
replacement bulbs and swap them out. Hopefully that will fix it.

Josh

> Hi - I have a P reg. c180 estate and the bulb warning light has came
> on. it seems to come on when i hit the brakes. I have checked the
[quoted text clipped - 3 lines]
>
> thanks :( :(

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dave_rose69 - 07 Jul 2005 19:35 GMT

> Hi - I have a P reg. c180 estate and the bulb warning light
> has came on. it seems to come on when i hit the brakes. I have
[quoted text clipped - 4 lines]
>
> thanks :( :(

Rowy.... If any bulb on the car has the incorrect resistance spec, the
bulb out indicator will glow. Get over to a Benz dealer and for about
10 bucks you can change all the bulbs in both tail lenses. Dont forget
to also change the license plate illumination bulbs as a pair
too...... Had the same problem with my wagon, and the new benz bulbs
cured it. Dont even think of experimenting with after market bulbs,
you could do irrepairable damage to other devices such as the cruise
control etc....
dave.....

1993 300TE 4 Matic 181,600

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Martin Joseph - 07 Jul 2005 21:23 GMT

> > Hi - I have a P reg. c180 estate and the bulb warning light
> > has came on. it seems to come on when i hit the brakes. I have
[quoted text clipped - 7 lines]
> bulb out indicator will glow. Get over to a Benz dealer and for about
> 10 bucks you can change all the bulbs in both tail lenses.

You are suggesting to go to the MB dealer to buy bulbs? That is
completely insane. You can go to the nearest autoparts store and get
them there. They are just as good.

> Dont forget
> to also change the license plate illumination bulbs as a pair
> too...... Had the same problem with my wagon, and the new benz bulbs
> cured it. Dont even think of experimenting with after market bulbs,
> you could do irrepairable damage to other devices such as the cruise
> control etc....

This is complete nonsense. There is no such thing as a "mercedes-benz"
light bulb...

Actually in several cases I have resolved this type of issue, by just
going to ever bulb and pulling it and cleaning the socket and
reinstalling it. A slightly loose or dirty bulb will cause this exact
issue.

Marty

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