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Old 02-07-2007, 01:54 AM
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Join Date: Apr 2004
Location: KY USA
Posts: 2,238
85/86+ Cruise Control Upgrade

My 380SL's cruise control is dead, my actuator is known good and rather than fool with it I'd like to put in a post-85 cruise module - I have a few known good spares. After '85, MB apparently standardized on an upgraded unit with coding plugs for certain engine/weights of cars. The manual specifically says that the newer unit, with appropriate coding plug, is directly substitutable for the older unit.

The coding plug (which are nothing more than housings for a small circuit board with some resistors on it) mentioned in the manual are:


005 545 07 32
005 545 08 32

It isn't mentioned which of these is "right" for a particular model, but I know that the first one was used in 560SEL/SEC's.

I don't have either of these modules - I have two entirely different coding plug spares, one for a 190E- but I've reverse engineered what resistors should be installed on the board inside the coding plug to make the ones that I have electrically equivalent to either of the above, and I can get these resistors. This may be useful to know, because there are a lot of (inexpensive) junk 190E's, and not very many (and expensive) junk 560SL's.

1. Does anyone know which of the above goes in a 560SL? I have a 560SL, but my car is immobilized in my garage right now in such a way that I can't open the drivers door!

2. Has anyone retrofitted an 86+ unit into a pre-86 107, specifically, a 380SL? What coding plug did you use? Any problems, surges, weirdness, etc? The resistors inside these plugs probably set the amplifcation, feedback, and hysteresis for the system, and these values are probably "touchy".


Thanks...

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Old 02-08-2007, 12:07 AM
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Join Date: Dec 2001
Location: Sunnyvale, CA
Posts: 128
These people repaired the cruise control on my 560sl. They even updated it so that it has a softer engage and dis-engage. They really know their stuff.

http://gdl-online.com/begin1.html


David

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