Thread: Speed Volume option on radio
View Single Post
  #9 (permalink)  
Old 01-02-2007, 01:39 PM
TeeSter TeeSter is offline
Ridiculously Active Enthusiast
  
Real Name: Tim
Hybrids: 2006 Escape 4WD
Posts: 1,248
Default Re: Speed Volume option on radio
Quote:
Originally Posted by rdinatal View Post
The signal is available and can be used. Now I need a day to find it.

-R

Vehicle Speed Signal

Note: If non-OEM tires are mounted on the vehicle, the pulse per mile frequency will change.

Note: Any device connected to the vehicle speed signal (VSS) circuit will require a high impedance of at least 1 megaohm. If this speed signal is compromised (by using a device with low impedance), the navigation system may not be able to show the correct position of the vehicle as accurately.

The vehicle speed signal (VSS) is sent from the brake system control module to the navigation system through circuit 679 (GY/BK). If the vehicle is not equipped with a navigation system, circuit 679 (GY/BK) ends in connector C210 pin 5. With OEM tires on the vehicle, the signal is 31924 pulses per mile.
On a somewhat unrelated note....I wonder if some of the people that complain that their NAV system is so far off (when it has no fix ) have their tire pressures up at 40PSI or more and that is throwing off the VSS distance sensor so the NAV can't guess how far they've gone... also wonder if that throws off their MPG numbers reported by the NAV.
Reply With Quote