Where is speed pulse wire?

[Rick J Fisher]

I am installing a Pioneer AVIC-D3 navigation unit in my 07 34FDDS. It wants a connection to the speed pulse wire so it can compute distance traveled. Lots of information on the web for cars but I can't find anything for my diesel motorhome. Has anybody solved this problem?

[Wayne R]

I have the AVIC N1 and was told the speed pulse wire was in the Trans ecm bundle "ECM Slot#20 Gray Trans wire". I had been using my AVIC N1 for 2 years when I finally got the info. I never went looking for it, My N1 works fine with out it.

[EngineerMike]

In theory, any reasonably capable GPS should be able to calculate distance traveled using the sum of the distances between refresh points. If the unit displays speed, it has to know how many miles and how many hours (or portions of an hour) to give miles per hour. My handheld does this.

Not sure why a GPS would want vehicle info at all, unless it was to report it instead of the unit's own knowledge, or maybe in case of loss of signal which will only be temporary.

[FlyingDiver]

Quote:

Originally posted by EngineerMike: In theory, any reasonably capable GPS should be able to calculate distance traveled using the sum of the distances between refresh points. If the unit displays speed, it has to know how many miles and how many hours (or portions of an hour) to give miles per hour. My handheld does this. Not sure why a GPS would want vehicle info at all, unless it was to report it instead of the unit's own knowledge, or maybe in case of loss of signal which will only be temporary.

There are several GPS units out there that have a speedometer input for calculating position when GPS signals are blocked. Usually in big cities with tall buildings. They often also have a compass built in.

Not something I'd worry about in an RV installation.

joe

[Rick J Fisher]

I agree that it should work without the speed sensor like my two Garmin units do so I will try it if I ever get it installed. The VADIC fits a 4x7 box and the radio I removed has a 3 1/2x7 opening. I am trying to locate a 4x7 box but that will still involve cutting clear through the trim.