E Class Cruise control

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wilby - 02 Feb 2006 20:36 GMT

I have an E Class CDI 220 - There is an intermittent fault on the the
cruise control which I can't fix. Some days it works faultlessly and
other days it won't work at all. It never fails in operation.
Sometimes simply stopping, waiting and then starting againn seems to do
the trick. The only fault showing in the brain was a faulty brake
light switrch and I have replaed that to no effect. Anyone any ideas
please.

Wilby

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Shawn - 02 Feb 2006 22:06 GMT

How old is the battery.
Mine was faulty on my E320 and it would show up as intermittant
malfunctions in a variety of different areas, one of which was a cruise
control problem every now and then. Replaced the battery, and it all
works fine

>I have an E Class CDI 220 - There is an intermittent fault on the the
>cruise control which I can't fix. Some days it works faultlessly and
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>
>

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wilby - 03 Feb 2006 18:17 GMT

I've tried this - it doesn't seem to be the problem - but thanks.

> How old is the battery.
> Mine was faulty on my E320 and it would show up as intermittant
[quoted text clipped - 13 lines]
> >
> >

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Josh - 04 Feb 2006 03:16 GMT

Check that your brake light switch is working correctly. My cruise control
had an intermittent failure which the dealership could not resolve
(thankfully it was under warranty) until some guy pulled up next to me and
said that my brake lights were not working. Sure enough, about one out of
every five or 10 times that brake lights were not coming on where I pressed
the brake pedal. This short caused the cruise control to not engage.

Josh

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Nihil - 07 Feb 2006 13:46 GMT

> I've tried this - it doesn't seem to be the problem - but thanks.
>
[quoted text clipped - 13 lines]
>>>
>>>Wilby

My E320 CDI (year 2000 newer body) shows the same fault but no error
codes reported. Like yours it is usually cured by restarting the car. I
had thought the problem had been cured when the brake detector switch
had its contacts cleaned and lubricated - that certainly cured the other
problem which was the shift selector refusing to leave Park - but the
problem has reoccurred occasionally since. Now I have a new battery I
shall see if that makes a difference.

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alan - 04 Feb 2006 10:51 GMT

I had similar problem and turned out to the sight vibration due to the
balancing on my wheels being out. This causing the switch to disengage.
However, yours does indicate a faulty brake switch.

>I have an E Class CDI 220 - There is an intermittent fault on the the
> cruise control which I can't fix. Some days it works faultlessly and
[quoted text clipped - 5 lines]
>
> Wilby

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KDV - 04 Feb 2006 16:47 GMT

>I have an E Class CDI 220 - There is an intermittent fault on the the
> cruise control which I can't fix. Some days it works faultlessly and
[quoted text clipped - 5 lines]
>
> Wilby

Check the brake light switch, bad contact in the pedal switch is probably
the reason, it was the problem in my car.

Signature

Kris De Voecht
Homepage: www.devoecht.com

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wilby - 05 Feb 2006 19:33 GMT

Thanks to all.

The car has a new brake light switch so that problem was eliminated. I
have then been back and checked the battery again. It is the original
and 6 years old and although it appears OK in normal use the voltage
was a little down. I have replaced the battery and the cruise now
functions perfectly 100% of the time. The only thing I can think is
that as part of the checks carried out before starting a voltage
reading is taken and stored, if the voltage indicates a sub standarad
battery then the brain refuses to engage the cruise (just a theory).

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