DriveRight ® VSS Installation Guide Product # 8155VSS, 8155VF, 8160VSS, 8160VF
Product Number: 8155VSS, 8155VF, 8160VSS, 8160VF Davis Instruments Part Number: 7395-062 DriveRight VSS Installation Guide ® Rev. D Manual (7/18/01) © Davis Instruments Corp. 2001. All rights reserved. This product complies with the essential protection requirements of the EC EMC Directive 89/336/EC. DriveRight is a registered trademark of Davis Instruments Corp. Velcro is a trademark of Velcro Industries, Manchester NH.
INTRODUCTION The following instructions explain how to complete a DriveRight VSS (Vehicle Speed Sensor) installation. VSS installation is only possible on the DriveRight Trip 500AL. COMPONENTS The DriveRight Trip 500AL (VSS Input) should come with all of the materials shown below. Please make sure you have all listed components before proceeding with the installation.
Tools and Materials Needed The installation requires some or all of the following tools and materials. Please make sure you have all necessary items before proceeding with the installation. ❏ Medium Phillips Screwdriver ❏ Crimping Tool ❏ Pliers ❏ Electric Drill with 2.5 mm (7/64") Drill Bit ❏ Fuse Tap ❏ Multimeter INSTALLATION The instructions contained in the following sections provide guidelines for installation of the Trip 500AL.
Wiring Diagram The diagram below provides an overall picture of the Trip 500AL VSS installation.
Step 1 : Determine Where to Mount the Driveright Display Knowing where you are going to mount the DriveRight display can help you make wiring decisions later on. For example, if your DriveRight is near the fuse box it will be convenient to get +12V using a fuse tap connector. However, if your DriveRight display is on the other side of the vehicle it may be easier to find a lamp circuit.
Step 3: Locate and tap power (+12V) and ground The DriveRight requires a constant +12 volts and has a negligible drain on the vehicle battery (8 ma). You can obtain the +12V from several different places. Generally, you can easily obtain +12V from the fuse box using a fuse tap connector (not supplied) or using the supplied in-line splice connectors to tap into a KNOWN circuit that does not involve safety related equipment (headlights, tail lights, air bag, etc.).
A ground can be made by inserting the spade terminal under the head of a screw threaded into the vehicle chassis and then crimping the spade terminal onto the black ground wire, as shown below. Check that the screw is actually grounded using a multimeter before making the connection.
Step 4: Connect the Harness Cable to the 3 Main Tap Wires Use the butt splice to connect the VSS in-line circuit input wires to your three main tap wires (+12V, Ground, VSS) by matching the wire colors. Red is used for +12V, black for the ground wire, and white for the VSS wire. Make sure the wiring harness extends to where you can plug the DriveRight display into it. Once the harness cable is connected, install the fuse into the fuse holder in the red (+12V) tap wire.
Use this flow chart to determine the optimum dip switch setting. NOTE: You will need to test drive the vehicle and observe the green test LED which is enabled using switch 4. 0 (zero) means the switch is off and 1 means the switch is on. The DriveRIght unit must be plugged in for the LED to indicate. Set 1 2 3 4 0 1 0 1 Yes 0 = OFF 1 = ON Drive 2 mph. Green LED flashing or dimmed? No Set 1 2 3 4 1 1 0 1 Drive 2 mph. Green LED flashing or dimmed? Yes No Set 1 2 3 4 1 0 1 1 Drive 2 mph.
Step 6: Mount the DriveRight Display in the Vehicle The following illustrations show possible mounting options for the display. TOP OF DASHBOARD (Horizontal Surfaces) Pan Head Self-Tapping Screw (2x) Split-Lock Washer Flat Washer OR Hex Nut Split-Lock Washer Flat Washer Right Angle Adapter Bracket Flat Head Machine Screw (2x) Mounting Bracket Loops Hooks Velcro on underside of unit for dashtop mounting.
Step 7: Connect the DriveRight Display and Go for a Test Drive Insert the battery into the DriveRight as shown below. Connect the harness cable to the DriveRight display cable as shown below. It is important to hold the DriveRight display cable as shown below (on the cable, not the sheath) in order to achieve a secure connection. The cables should “click” into place when a secure connection is made. Plastic Sheath Hold cables as shown to connect.
Go for a test drive and check that the DriveRight matches the speedometer. If it is not close at all, do not be discouraged since it may be uncalibrated. Consult the calibration section of the Trip 500AL User’s Guide for the Trip 500AL for instructions on calibrating the unit. If after calibrating the unit it still does not register speed correctly, move on to the troubleshooting section.
enable the test circuit). The following other methods can be used to see if you have the correct wire. In order of preference: ❏ Use a portable oscilloscope and verify the square wave or sine wave VSS signal. Watch the signal frequency change with speed. ❏ Using a multimeter to measure the frequency of the VSS pulse. Usually, the PPM (pulses per mile) of the VSS signal is known.
Technical Support If you are experiencing problems with your DriveRight VSS, first be sure to check all cable connections. If you are unable to solve the problem, please call Davis Technical Support. We’ll be glad to help. Most questions can be answered while you’re on the phone. You can also email us for support, or visit our website. Sorry, we are unable to accept collect calls. NOTE: Please do not return items to the factory for repair without prior authorization.
3465 Diablo Avenue, Hayward, CA 94545-2778 510-732-9229 • Fax: 510-732-9188 E-mail: info@davisnet.com • www.davisnet.
