It can also be a bad brake light bulb. I had this problem on my car twice.
The first time it was the spring contact at the bottom of one of the bulb
sockets. It just wasn't making good contact. I bent it back up and the
cruise was fine. Then a year later one of my bulbs burned out. I replaced
it, but the dealer gave me the wrong wattage bulb, and the cruise kept
acting up. Once I put the correct wattage bulb in, everything was back to
normal. I'd check these easy things before you go hunting for a cold solder
joint on the board.
1986 190E 2.3-16
first 16V in the US
featured in Car & Driver - March, 1986
Thanks for the tips. I'm amazed a brake lite could interfere with the
I'll definately check out the easy stuff first.
By the way, where is the circuit board located that may have a cold
solder joint or two? I use to be an ET in the coast guard so I know
how to burn my fingers with a soldering iron.
Check out these links:
http://gdl-online.com/remove.html (specifically MB 300E)
These guys are great. If you find you need to replace the amplifier, you'll
not find a better source.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.