Cruise control/tachometer? - Mercedes-Benz Forum
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#1 (permalink) Old 01-31-2012, 06:37 PM
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Cruise control/tachometer?

Guys,
The tachometer as well as the odometer on my 190D aren't functioning. It's been that way when I got the car.
With the tach not working cause the cruise control not to engage? What about the odometer? Could it be at fault?
By the way, is there a dash light which illuminates whenever the cruise control is engaged?

Any advise is greatly appreciated.
Raymond
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#2 (permalink) Old 01-31-2012, 06:48 PM
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What light comes on when cruise control is on?

Also, have you checked fuse 10? Both the tach and the CC are controlled by the same fuse.



1984 Mercedes 190D 2.2 Auto - 140,628 miles ("Restoration" project)
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#3 (permalink) Old 02-01-2012, 08:24 AM
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There is no light for the cruise control.

I suggest you:
1. Remove all fuses
2. Nicely clean all contacts in the fuse box with emery paper or high grit sandpaper.
3. Install all brand new fuses

I swear, 70-80% of the issues I've had in my car for the 3 1/2 years I've had my 190 were due to fuses. I hate these continental fuses. If anyone ever finds GLASS fuses that have the tapered ends like our continental fuses...please tell me. I'll buy 100 of every amperage we need.

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#4 (permalink) Old 02-01-2012, 08:52 AM
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Originally Posted by sunrays View Post
With the tach not working cause the cruise control not to engage? What about the odometer? Could it be at fault?
The fuse suggestion is the best bet. The odometer has no effect on the cruise, but the speedometer does. There is a Hall's effect sensor at the back of the speedo where the cable connects. Not likely it's defective but it could be.

The tachometer works off of a sensor on your flywheel, driver's side. No relation to the cruise. Cleaning that could help your tach. If checking and cleaning fuses doesn't work, the next best bet is the amplifier which sits under the floor mat at the passenger's side. That part has been upgraded multiple times from your original. Expensive part but generally found in wrecking yards much more reasonably. I have a later model direct replacement available should you need one.

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By the way, is there a dash light which illuminates whenever the cruise control is engaged?
NO.
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#5 (permalink) Old 02-01-2012, 10:25 AM
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Would a bouncy speedometer needle cause the cruise control not to work? Ever since I got my 201 in 2006 the cruise hasnt worked and the speedo has always been bouncy a bit.

Cruise not working? Send me a PM. I may be able to help/fix it. Check here for compatibility, tips, diagnostics, component locations, and availability!

1982 - 300SD 144,000
1982 - 300SD 270,000
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1989 - 560SEL 115,500
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#6 (permalink) Old 02-01-2012, 11:22 AM
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Would a bouncy speedometer needle cause the cruise control not to work? Ever since I got my 201 in 2006 the cruise hasnt worked and the speedo has always been bouncy a bit.
Yep.

Your cable is probably kinked. Either lube it or replace it and that MIGHT be the CC problem.
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#7 (permalink) Old 02-01-2012, 11:37 AM
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Yep.

Your cable is probably kinked. Either lube it or replace it and that MIGHT be the CC problem.
They're pretty cheap right now, I've never replaced one before. I do have a spare cluster that I've been meaning to swap parts on to mine (temp/vac/something to fix my trip)

Ever replace a cable? Difficult?

Cruise not working? Send me a PM. I may be able to help/fix it. Check here for compatibility, tips, diagnostics, component locations, and availability!

1982 - 300SD 144,000
1982 - 300SD 270,000
1989 - 420SEL 210,900
1989 - 560SEL 115,500
1990 - 300SE 263,000
1990 - 560SEL 156,000
1993 - 190E 3.0 225,000
1993 - 300E 191,000
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#8 (permalink) Old 02-01-2012, 11:53 AM
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Routing the cable up through the firewall isn't particularly hard, just a lot of "on your back" work.
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#9 (permalink) Old 02-01-2012, 11:56 AM
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I remember removing this spare cluster from the 201 at the yard was fairly annoying. The cable had no slack in it and was a bear to loosen. i just dont want the same thing to happen here. It seems like installing the cable cluster end first, mounting the cluster than routing/attaching at the transmission is the best way.

Cruise not working? Send me a PM. I may be able to help/fix it. Check here for compatibility, tips, diagnostics, component locations, and availability!

1982 - 300SD 144,000
1982 - 300SD 270,000
1989 - 420SEL 210,900
1989 - 560SEL 115,500
1990 - 300SE 263,000
1990 - 560SEL 156,000
1993 - 190E 3.0 225,000
1993 - 300E 191,000
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#10 (permalink) Old 02-03-2012, 02:45 AM
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Replacing the speedometer cable is no guarantee that you will repair the cruise control. That is like trial and error with accupuncture.

I suggest troubleshooting the cruise control system using an electrical rather than a mechanical approach. Start in the middle and work out. (To guess a number between 1 and 100, start at 50).

On early models, the speedometer sensor on the back of the instrument cluster is a transformer, not a Hall sensor.
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