If the speed sensor wire is under the dash, you can run
the lead to the DVD-ROM drive under the carpet on your
vehicle’s floor. If the wire is under the hood, you’ll have to
get the navigation system’s lead to it through the firewall.
Try to locate an existing hole on the firewall of your vehicle;
most cars will have a pre-drilled hole through which some
of the car’s wiring already runs. If you can’t find one, you’ll
have to find a good place to drill one — take care not to
drill through a gas line or electrical wiring. We recommend
that you drill your own hole only if necessary.
Once you’ve found or drilled a suitable hole, run the speed sensor lead
through the hole into the engine compartment, then connect it to the
speed sensor wire. (If you’ve drilled the hole, install a rubber grommet in
it to prevent damage to the lead.) Once you’ve made the connection, run
the lead to the DVD-ROM drive under the vehicle’s carpet.
Finding and connecting to the reverse light
The navigation system also needs to be connected to your vehicle’s
reverse light; it has to know when you’re going backwards for accurate
positioning and route calculation. The easiest way to do this is to connect
to the reverse light wire right at the tail light. As with the speed sensor,
you can consult your wiring diagram in order to find it. You can also check
each wire that goes into the taillight with a multimeter; connect the mul-
timeter to a wire, have someone put the car in reverse (while keeping the
brake engaged, of course), then see if you get a 12-volt reading. Repeat
this process with each wire until you’ve found the right one. (
Note:
if you
get a 12-volt reading, make sure it’s because you’ve found the reverse
wire, not the brake wire; you’ll know it’s the brake wire if you get a reading
as soon as the brake is pressed.)
As with the speed sensor, either wire-tap the reverse light wire or strip
and solder it. You can then run the connecting wire
from the tail lights to the DVD-ROM drive. Depending
on the vehicle you drive, this could involve removal
of trim panels, lifting of sections of carpet, and even
backseat removal (if you’re running the lead from
the trunk to the DVD-ROM drive in a passenger car).
The reverse wire can sometimes be found under
the dash or under the hood, but you’ll have to consult your wiring diagram
carefully in order to identify it correctly; tapping into it at the taillight tends
to be much easier.
000NAVIG
3
Using a wire tap and male disconnect
is the easiest way to make the wiring
connections you’ll need.
The wire tap clamps on the wire
you’re connecting to; the male
disconnect crimps onto the new
wire you’re connecting.
The male disconnect
slides firmly onto the end
of the wire tap, making a
secure connection.
When running a wire from under the
hood into the cab through the vehicle’s
firewall, we recommend you find and use
a pre-existing opening, where other wires
come into the vehicle cab.
The easiest place to connect to your reverse light is in the
back of the vehicle. As pictured above, however, you may
choose to make a connection under the hood instead.
Connecting to the Speed Sensor (cont.); Connecting to the Reverse Light
Always be careful when
drilling or cutting in a
vehicle. Be aware of
things such as wiring,
windows, fuel lines and
safety devices. Check
drilling/cutting depth
and location to avoid
damage to vehicle
appearance.
CAUTION:
!
✔
Check reverse light wiring connection and test operation.
SAFETY CHECK
!
