Most head units use the speedo signal for automatic sound control - it increases the sound as you speed up, lowers it as you slow down. It's an attempt to compensate for road noise, I guess. Lots of cars have it now - I thinkk MB/Becker had it since the early 90s. For some reason I was thinking the 91 300E I had had the feature.
Dan --- On Sun, 9/6/09, Craig McCluskey <diese...@pisquared.net> wrote: > From: Craig McCluskey <diese...@pisquared.net> > Subject: Re: [MBZ] Traffic Pro > To: "Mercedes Discussion List" <mercedes@okiebenz.com> > Date: Sunday, September 6, 2009, 3:43 PM > On Sun, 6 Sep 2009 10:35:03 -0400 > Jaime Kopchinski <jaime...@gmail.com> > wrote: > > > On a W126, you can tap the speed signal from the back > of the speedo, the > > single pin wiring connector. Its easy to make a > simple Y adapter with > > some bullet connectors so you don't modify the > original wiring at all. > > This doesn't effect the function of the cruise control > either. > > So why would the thing want a connection to the > speedometer? GPS, after > all can calculate how fast you're going and much more > accurately than a > speedometer. > > > Craig > > _______________________________________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
