DAVIS DriveRight Installation - VSS (8156, 8160) - Manual (Page 12)

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Because not all VSS signals are the
same, you may need to change the
default DIP switch setting on the VSS in-
line circuit.
❏ Switch 1 is used for square
wave VSS signals which do not
go to ground.
❏ Switch 2 AC couples the signal in and is used for sine wave VSS signals.
❏ Switch 3 improves the sensitivity of AC coupled signals.
❏ Switch 4 turns on the LED test circuit.
I‚‡r) No DIP switch settings are required for the Ford F-250 truck harness cable supplied
with DriveRight 600 #8156VF and DriveRight VSS Installation/Mounting Kit #8160VF.
The Ford F-250 cable is for use on F-250 trucks only.
Refer to the VSS DIP Switch Flow Chart on the following page when performing
these steps:
Set the DIP switch as shown at the top of the chart.
Be sure to turn on switch 4 to enable the test LED.
I‚‡r) On the DIP switch, 0 (zero) is OFF and 1 is ON.
! Test drive the vehicle and observe the green test LED.
I‚‡r) The DriveRIght unit must be plugged in for the LED to flash.
" Refer to the flow chart and adjust the switch settings accordingly.
# Repeat steps 2 and 3 as necessary to finish configuring the VSS signal.
$ And, don’t forget to turn off the test LED, switch 4, when you are done.
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I‚‡r) The DriveRight comes with sample data pre-programmed into the log so you can use all
of the unit’s features immediately. As you use the unit, this data will automatically be
over-written by new data.
Go for a test drive and check the DriveRight speedometer reading. The
reading will usually be incorrect unless the console was previously calibrated
for your vehicle.
I‚‡r) It is possible that the unit may sound an alarm unexpectedly during an initial test
drive. The alarm can be caused by incorrect calibration along with the alarm
being set or just by the login alarm being set. Enter a Driver ID code on the unit
to silence the login alarm. If this does not work, you need to turn the alarm off.
Consult the DriveRight 600 User’s Guide for specific instructions on entering a
Driver ID code or turning off the alarm.
! Refer to DriveRight 600 User’s Guide for calibration instructions and
calibrate the unit. If the speed is still incorrect, refer to the Troubleshooting
section on page 12 in this manual as well as the troubleshooting information
in the DriveRight 600 User’s Guide for help.
VSS Dip Switch
07395.062 Rev E Body D121.fm Page 10 Monday, December 1, 2003 10:52 AM