clbourq Posted July 2, 2008 Report Share Posted July 2, 2008 noob question here....I just hooked up the Speed-sensor wire and the back-up light wire. I dont notice any difference from when I was driving around without those wires hooked up. what do these wires really do to the unit as far as information? does it really make that big of a difference? I went about 2 weeks without hooking them up and everything seemed to work fine for me. any input? Quote Link to post Share on other sites
CamelTowing Posted July 2, 2008 Report Share Posted July 2, 2008 VSS makes it work better when you don't have sat reception. Reverse is for when you have a back-up camera Quote Link to post Share on other sites
HiFiSi Posted July 2, 2008 Report Share Posted July 2, 2008 Neither are a necessary connection. They just help the nav unit stay accurate, especially when it's in an area with limited or no satellite signal. Quote Link to post Share on other sites
clbourq Posted July 2, 2008 Author Report Share Posted July 2, 2008 gotca, thanks for the info Quote Link to post Share on other sites
CatchMeIfYouCan631 Posted July 2, 2008 Report Share Posted July 2, 2008 Neither are a necessary connection. They just help the nav unit stay accurate, especially when it's in an area with limited or no satellite signal. wouldnt the speed sensor wire not help that much tho? say your in a tunnel and you lose gps but the speed sensor wire still knows how fast your movin....what if the tunnel curves left, the speed wire alone wont know what direction your going.. Quote Link to post Share on other sites
HiFiSi Posted July 2, 2008 Report Share Posted July 2, 2008 No... The unit tends to keep you on the road as far as mapping goes. If you are running around a long curve and lose satellite signal, the VSS will tell the nav that the car is still in motion, and the unit will keep plotting you along, ON THE PATH OF THE ROAD YOU ARE ON, not in a straight line. Once it re-establishes satellite signal, it will attempt to re-calibrate it's location if there is any kind of discrepancy. On the D3, there were also internal gyros that helped the nav unit negotiate turns and changes in altitude, which helped tremendously when the signal was lost. I'm not sure, but there has been discussion that the F90 also has these internal gyros, but no concrete answer has been discovered. Quote Link to post Share on other sites
CatchMeIfYouCan631 Posted July 2, 2008 Report Share Posted July 2, 2008 No... The unit tends to keep you on the road as far as mapping goes. If you are running around a long curve and lose satellite signal, the VSS will tell the nav that the car is still in motion, and the unit will keep plotting you along, ON THE PATH OF THE ROAD YOU ARE ON, not in a straight line. Once it re-establishes satellite signal, it will attempt to re-calibrate it's location if there is any kind of discrepancy. On the D3, there were also internal gyros that helped the nav unit negotiate turns and changes in altitude, which helped tremendously when the signal was lost. I'm not sure, but there has been discussion that the F90 also has these internal gyros, but no concrete answer has been discovered. hmm...i learn somethin new from u everyday. thanks for all the replies do you do car electronics for a living, or its just a passion you have? cuz u deff know what ur talking about in just about every topic. Quote Link to post Share on other sites
HiFiSi Posted July 2, 2008 Report Share Posted July 2, 2008 I'm an architectural designer, so it's not my job or anything. I used to install car stereos on the side when I was younger, but that was quite a few years ago. I don't really do it much anymore, aside from my own vehicle(s). I just kinda... know things about stuff. Quote Link to post Share on other sites
CatchMeIfYouCan631 Posted July 2, 2008 Report Share Posted July 2, 2008 I'm an architectural designer, so it's not my job or anything. I used to install car stereos on the side when I was younger, but that was quite a few years ago. I don't really do it much anymore, aside from my own vehicle(s). I just kinda... know things about stuff. o thats cool, thats what i was goin to school for, but turns out it wasnt really for me i really wanna get certified for car electronics and open up a shop, but just like architecture its a cut throat competition, especially here where you have circuit city and best buy 5 miles apart plus about 4 well known audio places... but bak to the vss, about the gyro... IF the 900s and 90s have an internal gyro, which does know direction and speed (the Z has a compass and speedometer in the dynamics) then would installing the speed wire still be necessary since itd know where and how fast youre going? Quote Link to post Share on other sites
HiFiSi Posted July 2, 2008 Report Share Posted July 2, 2008 No, it's not necessary IF it has the internal sensors/gyros to let it know what's going on. If it doesn't, the VSS signal is a pretty big necessity. I don't think anyone's actually determined whether or not they do or do not have them, though. http://www.avic411.com/forum/viewtopic.php?t=15986 Quote Link to post Share on other sites
CatchMeIfYouCan631 Posted July 13, 2008 Report Share Posted July 13, 2008 This is for HiFiSi about the gyro myth:: i have the f700bt, and a few days ago i jus put the speeding warning on. i was on the highway today and it told me i was speeding, but i dont have the vss wire hooked up..is it safe to say that they have a built in gyro? cuz how else would it know if i was goin too fast or not? Thanks! Quote Link to post Share on other sites
gjas18 Posted July 14, 2008 Report Share Posted July 14, 2008 My 700BT didn't even have a speed wire in the harness. So I would suppose the 700BT can't use speed pulses from the vehicle. Well, GPS is accurate enough 99% of the time anyway so probably a cost cutting measure Quote Link to post Share on other sites
HiFiSi Posted July 14, 2008 Report Share Posted July 14, 2008 This is for HiFiSi about the gyro myth:: i have the f700bt, and a few days ago i jus put the speeding warning on. i was on the highway today and it told me i was speeding, but i dont have the vss wire hooked up..is it safe to say that they have a built in gyro? cuz how else would it know if i was goin too fast or not? Thanks! It can get speed info from your GPS signal. A gyro can not sense what speed you are going, or what direction you are pointing. It can only sense CHANGES in speed, direction, incline, and elevation. Quote Link to post Share on other sites
talontsiawd Posted July 20, 2008 Report Share Posted July 20, 2008 I don't have my VSS hooked up and if i compare the speed (you can put this to display in the navi settings), it's exactly what my speedo reads. I'm convinced that the device only uses this for voltage, not for an actual signal. I'm not saying i'm correct, this is just my personal belief. Quote Link to post Share on other sites
HiFiSi Posted July 20, 2008 Report Share Posted July 20, 2008 ^ Like it has been said before, if you have a good GPS signal you don't need it as the unit gets it's speed reading from the GPS signal. BUT, if you lose signal, the speed sensor wire will help keep the nav accurate. Quote Link to post Share on other sites
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