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Teletrac, Inc. - Prism TM Information and Installation Guide
PRISM TM I
NSTALLATION
Once you have all your tools in order and have planned the location of all the devices, you are
ready to install the unit. Following are the steps for two types of installations, replacement of an
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existing VLU
OR Prism and installation of a new PRISM TM.
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Replacing a VLU
with a PRISM TM
You can use all the same wiring and only need to switch out the unit itself. However, there will be
an adapter between the unit and the VLU
1. Locate the existing VLU
the power source.
2. Disconnect the antennas from the VLU
3. Disconnect the 37-pin VLU
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4. Remove VLU
and note the IP address.
5. Using a voltmeter, make sure that the ignition line (white harness wire pin 6) is correctly wired
to the keyed side of the ignition switch at the ACCESSORY wire. This wire goes high upon
turning the key but it goes low when at the CRANK position. Also that the power input (red
wire) is connected to a constant (unswitched) +12v DC supply.
6.
Verify that the existing harness has all required wires soldered or crimped for reliability.
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7. Attach the VLU
then plug the adapter into the PRISM TM unit.
8. Mount the PRISM TM to the chassis of the vehicle utilizing the mounting tabs. Secure the
unit with four (4) self-tapping machine screws.
9. A new antenna must be installed since the connectors from the Connect the SMA connector
to the GPRS antenna port on the unit. Connect the SMB GPS connector to the PRISM TM.
10. Reattach the main vehicle power and/or replace the fuse.
PRISM TM New Installations
1. Find suitable locations for the PRISM TM, and GPS/GPRS combo antenna. Select a PRISM
TM mounting location that is free of moisture or heat, typically behind the dashboard or under
the seat.
2. Install the GPS antenna and route the cable to the PRISM TM location. Typically, the
installation will require a hole drilled into the vehicle. The exact size of the hole is dependant
upon the antenna mount used. Keep in mind that coax must be run behind panels. Note that
the GPS antenna should have no blockage 5° above the horizon. (See Antenna Placement
page 5.)
3. Install the GPRS antenna and route the antenna cable to the PRISM TM location. This will
also typically require a hole drilled into the vehicle. The exact size of the hole is dependant
upon the antenna mount used. Keep in mind that coax must be run behind panels. (See
Antenna Placement page 5.) If a Combo antenna is being used only one hole will be
required.
4. Apply silicone around both antenna bases if holes are required.
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P
ROCEDURES
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harness; see wiring schematic.
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and remove the fuse or disconnect main power to the VLU
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.
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wiring harness.
wiring harness 37-pin connector to the adapter, tighten the screws, and
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at
1622-0300 B1 3/18/04
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