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Old 01-13-2002, 12:35 AM
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Join Date: Aug 2000
Location: Houston, Texas
Posts: 325
Cruise Control was working after changing amp, now quit working again

I purchased my '82 240D about 2 years ago with the cruise control not working. I recently replaced the amplifier with a brand new one since i had a good idea from previous posts that these amplifiers caused alot of the problems. Well, I replaced it and the cruise control was working flawlessly for about 2 weeks. Then, about a week ago, whenever I set the cruise control, it started to hunt for the selected speed....sort of like surging (accelerate and then decelerate). It got to the point that when I set the speed for about 60, the CC would take a while for it to come on line then it would come on and would start surging and hunt for 60. Now when I set the CC, nothing happens....not even the surging. What could be wrong now?

Thanks for your input.

'82 240D
'87 300SDL
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Old 01-13-2002, 01:20 AM
jbaj007's Avatar
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Join Date: Jun 2001
Location: Santa Monica, CA
Posts: 2,053
GDL has a great site. Check your actuator ampere draw. It can use the cruise control amplifier as an expensive fuse! particularly item #3.
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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Old 01-16-2002, 03:32 PM
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Join Date: Aug 2000
Location: Houston, Texas
Posts: 325
Thanks jbaj007. GDL has a great site. I'm suspecting the CC actuator is faulty but I will have to go through the testing process to make sure. It just makes me mad that the CC was working perfectly after the amp was replaced and now isn't working at all.
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Old 01-17-2002, 08:37 AM
dpetryk's Avatar
Electrons can do anything
Join Date: Sep 2001
Location: Houston, Texas
Posts: 1,071
I would check the switch. The actuators almost never go bad. But the switches are another story.

Im not sure if your CC system is the same as mine but I have clipped a schematic of the switch wiring. It might be of some help.
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Cruise Control was working after changing amp, now quit working again-cc.jpg  
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