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Note: If you are install ng an
MP 555 GPS in a vehicle in
which an MP200 was previously
installed, you can use the
MP200 power harness that is
already installed. The only
difference between the
harnesses is that the MP200
harness has a fused ground wire
whil
e the MP 555 GPS harness
has an unfused ground wire.
Note: Do not install an on/off
switch on the main (red) battery
line, or connect the white ign
sense wire to the red battery
wire. Both configurat ons bypass
the modem's controlled
shutdown sequence, and may
cause data loss and subsequent
power-on problems. Incorrect
wiring may also completely drain
the vehicle battery.
Rev 2.1
Jan.05
Power connector (Molex) pinouts
The pinouts for the Molex connector on the power harness are
as follows:
i
White wire
(Ignition sense)
Red wire
(Battery)
Figure 2-9: Pinouts for the power harness.
The battery (red and ignition sense (white) wires in the power
harness include 5 A fuses. The black ground wire is not fused.
(See "Power Harness Grounding" on page 22.) Replacement
power harnesses are available from Sierra Wireless.
Ignition Sense On/Off Wiring
The modem's power on/off is controlled by the ignition sense
line (white wire) using internal software, rather than a hard
on/off switch on the red power line. The red, black, and white
ition
wires connect to the battery and ignition switch as shown in
the power harness wiring diagram.
i
Switch (vehicle
i
gnition key, or
separate)
Vehi
cle battery
Figure 2-10: Wir ng for the power harness. The white wire is ignition sense.
•
When the white ignition sense line is pulled high (5 to
36 V), the modem will power on.
•
When the ignition sense line is pulled low (less than 2 V),
the modem performs a controlled shutdown sequence
Installing the MP 555 GPS Modem in a Vehicle
(Unused)
Black wire
(Ground)
)
Red w
ire
(Battery)
White wire
(Ignition sense)
i
5 A fuses (on red
and white only)
MP
Black unfused wire
(Ground)
21
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