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#1
01-09-2007, 04:13 AM
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W126 Cruise Control acting all funny
I tried to search this one, but to no avail.
Overall my crusie control works as it should. The four positions on the cruise control stalk all do what they're supposed to (set/accell, decel, resume, cancel.) The only problem is that when engaged, the cruise control acts as though it is tapping on the gas pedal the entire time. If I place my foot on the gas pedal I can feel it going in and out. Does this sound like a problem with the cruise control amplifier? If so, is it advisable to attempt to repair it? Oh...the car is a 1987 560SEL, 242,000 miles, very loved 
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#2
01-09-2007, 07:12 AM
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Amplifier problem. Needs to be re-soldered. How are your electronic repair skills?
__________________
I got too many cars!! Insurance eats me alive. Dave 78 Corvette Stingray - 3k 82 242 Turbo Volvo - Manual - 270k 86 300e 5 speed manual - 210k 87 420sel - 240k 89 560sl - 78k 91 420sel - 205k 91 560sel - 85k 94 GMC Suburban - 90k 97 Harley Davidson Heritage Softail - 25k 00 GMC Silverado 1 ton 30k
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#3
01-09-2007, 03:26 PM
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Good enough to give it a shot, I successfully re-soldered the buzzer/light relay thing last year.
Is it okay to remove the amplifier and still drive the car around? Any hints I need before getting into this?
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#4
01-09-2007, 05:02 PM
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The circuit board is dipped in a conformal coating to protect it from moisture. Don't attempt to re-solder without stripping the coating off (solder side only). Use a gel type stripper from the local hardware store. Brush on and let it wrinkle - don't leave on any longer than you need to. Wash off with a blast of water from the garden hose and immediately dry with compressed air. The bad solder connections are usually around the rectangular capacitors.
There is no problem driving the car with the module out.
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#5
01-09-2007, 09:39 PM
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Okay, thanks for the heads up. I'll pull it out tonight and hopefully have good news to report in the next few days...
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#6
01-09-2007, 10:06 PM
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Just solder right thru the coating. You dont want to add any harsh chemicals to the conductors. It might cause electrical leakage.
__________________
I got too many cars!! Insurance eats me alive. Dave 78 Corvette Stingray - 3k 82 242 Turbo Volvo - Manual - 270k 86 300e 5 speed manual - 210k 87 420sel - 240k 89 560sl - 78k 91 420sel - 205k 91 560sel - 85k 94 GMC Suburban - 90k 97 Harley Davidson Heritage Softail - 25k 00 GMC Silverado 1 ton 30k
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#7
11-02-2007, 09:20 PM
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I do not mean to resurrect this thread, but my problem is similar. I have a w202 and my cruise was working intermittently at best. I took out the amplifier and soldered the unit and it stopped working altogether. I guess my soldering skills were not as good as I thought!
I ordered a used amplifier, and while I was waiting for the unit, my CEL light came on and the code stated that there is a problem with the speed sensor. I installed the new amplifier and the cruise did not work. Probably because of the speed sensor? Is there a way for me to find out which sensor it is?
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