Flaky Cruise Control
Thread Starter
Newbie
Joined: Mar 2002
Posts: 21
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Flaky Cruise Control
A little help required here please.
My Tempomat cruise control on my 1993 W124 320CE keeps on intermittently switching off.
Its one of the best parts of the car
so its annoying to keep having to set it again.
This seems to happen at random and at any speed and I believe its getting worse - that is it is switching off more and more often.
All ideas & comments gleefully accepted .
My Tempomat cruise control on my 1993 W124 320CE keeps on intermittently switching off.
Its one of the best parts of the car
so its annoying to keep having to set it again.This seems to happen at random and at any speed and I believe its getting worse - that is it is switching off more and more often.
All ideas & comments gleefully accepted .
MBWorld Fanatic!
Joined: Dec 2006
Posts: 1,042
Likes: 1
From: Bellevue, NE
1995 E320 SE, 162,000 Miles (Sold) 2007 CLK350 Cabriolet 2014 ML550
A little help required here please.
My Tempomat cruise control on my 1993 W124 320CE keeps on intermittently switching off.
Its one of the best parts of the car so its annoying to keep having to set it again.
This seems to happen at random and at any speed and I believe its getting worse - that is it is switching off more and more often.
All ideas & comments gleefully accepted .
My Tempomat cruise control on my 1993 W124 320CE keeps on intermittently switching off.
Its one of the best parts of the car
so its annoying to keep having to set it again.This seems to happen at random and at any speed and I believe its getting worse - that is it is switching off more and more often.
All ideas & comments gleefully accepted .
MBWorld Fanatic!
Joined: Dec 2006
Posts: 1,042
Likes: 1
From: Bellevue, NE
1995 E320 SE, 162,000 Miles (Sold) 2007 CLK350 Cabriolet 2014 ML550
Senior Member
Joined: Mar 2007
Posts: 268
Likes: 0
1992 190E 2.6L
It could be anything in the fuel distribution system as well. MAF Sensor, a vacuum leak, electric short. It may even be a bad column switch or maybe just worn. Are you in a dusty environment? Sand/Dust can cause contact damage around the steering area due to open windows especially aroung the area of the turn signal switch and the cruise control.
-J
-J
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MBWorld Fanatic!
Joined: Feb 2006
Posts: 1,325
Likes: 2
From: Seattle
1990 300ce
look this issue up on mercedesshop.com. Many people have found that you just need to pull the cruise control amp and re-solder all of the contact points, just like carlson said.
My understanding is that the amp is mounted somewhere near the steering column or under the dash near the driver's feet.
My understanding is that the amp is mounted somewhere near the steering column or under the dash near the driver's feet.
Member
Joined: Jun 2007
Posts: 109
Likes: 0
From: Ohio
03 ML500
yeah, the amp is located just under the steering column...there are plenty of help guides on how to do it, but if you can't locate one, I can tell you how to do it.
btw...when I opened the amp, there was some sort of coating that mine had, looked like to protect the circuits...not sure, but I used paint stripper to remove it, then I was able to start the soldering.
I spent about 30 minutes, just going over most of the points, adding solder to joints that needed it. If you have any soldering experience, and a good soldering tip, should be an easy fix, hopefully.
btw...when I opened the amp, there was some sort of coating that mine had, looked like to protect the circuits...not sure, but I used paint stripper to remove it, then I was able to start the soldering.
I spent about 30 minutes, just going over most of the points, adding solder to joints that needed it. If you have any soldering experience, and a good soldering tip, should be an easy fix, hopefully.
Junior Member
Joined: Aug 2004
Posts: 17
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07 e350 127k 02 320e 124k miles 93 300e 3.2 liter 221,000 previous 89 300e 200,000
93 300e 3.2 liter cruise problem solved
I had the same type of problem where it worked at times and then just stopped working, later, minutes, hours, days it would be ok again. Common thread seemed to be the ambient temp display would go blank too. It was not and still is not showing correct temps but it seemed to go blank at the same time. I then had a coolant hose failure, not really the hose but a "Y" type of hard plastic hose connection on the left firewall that had a small leak. It got worst and finally failed. I changed it and noticed at that point that a couple of wires ran directly under it, I surmise, could be the ambient temp wire and the cruise control wires. Anyway leak fixed, no more cruise problems and the ambient temp displays, albeit wrong temps, it generally displays about 127, goes up to the 130's and sometimes goes down to the high teens. Just "AWAG" as a possible solution.
Good luck
Good luck
Thread Starter
Newbie
Joined: Mar 2002
Posts: 21
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I have had the tyre problem before, I think I had a pair of 205/50/16's so I put them on the front.
After that the cruise would not work above around 40mph, took me a few hours to work out what was wrong.
Thread Starter
Newbie
Joined: Mar 2002
Posts: 21
Likes: 0
yeah, the amp is located just under the steering column...there are plenty of help guides on how to do it, but if you can't locate one, I can tell you how to do it.
btw...when I opened the amp, there was some sort of coating that mine had, looked like to protect the circuits...not sure, but I used paint stripper to remove it, then I was able to start the soldering.
I spent about 30 minutes, just going over most of the points, adding solder to joints that needed it. If you have any soldering experience, and a good soldering tip, should be an easy fix, hopefully.
btw...when I opened the amp, there was some sort of coating that mine had, looked like to protect the circuits...not sure, but I used paint stripper to remove it, then I was able to start the soldering.
I spent about 30 minutes, just going over most of the points, adding solder to joints that needed it. If you have any soldering experience, and a good soldering tip, should be an easy fix, hopefully.
Thanks for all the help with this issue.
Newbie
Joined: Sep 2007
Posts: 7
Likes: 0
1996 C220
I have been trying to troubleshoot my cruise. It started out working intermittently and then I took out and resoldered the amp and it stopped working altogether. I bought two used replacement units that were tested and it still did not work. Later on, my CEL came on and it was for the idle and found my actuator/throttle body may be going bad. My INDY replaced with a used unit and the idle problem went away and he cannot find the problem with the cruise. I then replaced the brake switch and still no go. All tires are the same size/pressure.
Any ideas?
Hank
Any ideas?
Hank
