A. Locate transceiver for remote radios on driver's side
of trunk as near to the vehicle body side as possible.
B. One piece transceivers should be mounted under dash or
on transmission hump where they will not interfere with vehicle
controls or passenger movement.
Great care should be taken not to mount any transceivers, microphones,
speakers or any other item in the deployment path of a Supplemental
Inflatable Restraint or "Air Bag".
A. Each vehicle model and body style reacts to radio frequency
energy differently. When dealing with an unfamiliar vehicle, it
is suggested that a magnetic-mount antenna be used to check the
proposed antenna location for unwanted effects on the vehicle. Antenna
location is a major factor in these effects.
The antenna should be a permanent-mount type located in the center
of the roof or center of the rear deck lid. Glass mounted antennas
should be kept as high as possible in the center of the rear window
or windshield. If a magnet-mount antenna is used, care should be
taken to mount the antenna in the same location as a permanent-mount
type. If a disguise-mount antenna is used, great care should be
taken to shield any tuning network from vehicle electronics and
wiring, or to mount the tuning network in an area completely clear
of vehicle electronics and wiring.
C. Standard metal mount antennas may be mounted on a vehicle
with nonmetallic body panels by two methods. Most nonmetallic skinned
vehicles have metal frames underneath. Mounting the antenna near
a metal frame section and bonding the antenna mount to the frame
with a short metal strap will provide the groundplane connection.
Some antenna manufacturers offer "groundplane kits" that consist
of self adhesive metal foil that may be attached to the body panel
to provide the groundplane for the antenna.
D. Some vehicles use glass that contains a thin metallic
layer for defrosting or to control solar gain. Glass mount antennas
will NOT function when mounted on this type of glass. Consult your
GM dealer or owner's manual to determine if this glass is installed
on your vehicle.
RF related interactions occur when using a hitch or bumper mount
HF antenna on a vehicle that has body on frame construction (ie
Pickup, SUV) connect a ground strap from the vehicle frame to the
bottom rear of the vehicle body (for station wagon type vehicles),
or from the vehicle frame to the bottom rear of the cab (pickup
A. Always use a high quality coax (at least 95% shield coverage)
located away from the Engine Control Module and other electronic
B. Care should be taken to maintain as great a distance as
possible between any vehicle wiring and the feedline.
A. It is important that the antenna be tuned properly and
reflected power be kept to less than 10% (VSWR less than 2:1).
Wiring and Connection Locations
A. Connecting radio power on General Motors vehicles is model
dependent. The installer must decide which one of the following
four methods will be appropriate.
1.) Connect the positive and negative leads directly to the
battery terminals (illustrated in this guideline).
2.) Connect the positive lead to the auxiliary power terminal
(located at the underhood fuse center or identified by a red plastic
cover in the underhood area) and connect the negative lead directly
to the negative battery terminal.
3.) Connect the positive lead to the auxiliary power terminal
and connect the negative lead to the battery body connection point
(identified by a short #10 AWG or larger wire running from the negative
battery terminal to the body of the vehicle).
4.) Connect the positive and negative leads to the Special
Equipment Option (SEO) wiring provided for this purpose.
connections are made directly to the battery terminals, the GM approved
methods of connecting auxiliary wiring include the adapter package
illustrated in Figure 2, NAPA-Belden replacement
battery bolts (part # 728198), or drilling and tapping the hex end
of the original battery bolts 10-32 X 3/8" deep. NOTE: It is
recommended that a fuse be placed in the transceiver negative lead
to prevent possible transceiver damage in the event the battery
to engine-block ground lead is inadvertently disconnected.
C. For ONE-PIECE TRANSCEIVERS where ignition switch control
is desired and no SEO wiring exists, a 12 Volt power contactor must
be installed in the transceiver positive lead. The contactor should
be located near a proper 12 Volt feed. The coil of the contactor
should be connected through an appropriate in-line fuse to an available
accessory circuit or ignition circuit not powered during cranking.
The contactor coil must return to a proper negative point. Detail
"A" illustrates direct connection to the vehicle battery.
negative lead from a handset or control unit must return to a proper
negative connection point. It is preferable that the positive lead
for a handset or control unit be connected directly to a proper
positive feed. If ignition switch control is desired, the handset
or control unit positive lead may be connected through an appropriate
in-line fuse to an available accessory circuit or ignition circuit
not powered during cranking. It is recommended that the handset
or control unit positive and negative leads be appropriately fused
separately from the transceiver positive and negative leads.
multiple transceivers or receivers are to be installed in the vehicle,
power leads to the trunk or under dash should be connected to covered,
insulated terminal strips. All transceivers or receivers may then
have their power leads connected to the strips. This makes a neater
installation and reduces the number of wires running to the vehicle
A. The power leads should be brought through a grommeted
hole in the front bulkhead that must be provided by the installer.
For trunk-mounted transceivers, the cables should continue on along
the driver's side door sills, under the rear seat, and into the
trunk through the rear bulkhead. All attempts should be made to
maintain as great a distance as possible between radio power leads
and vehicle electronic modules and wiring.
the battery is located on the passenger side, radio power leads
should cross the vehicle in front of the engine.
A. Should vehicle-radio interaction develop following installation,
the source of the problem should be determined prior to further
operation of the vehicle. Most interaction problems can be eliminated
by following the installation guideline.
any vehicle-radio interaction problems exist after following this
guideline, the vehicle should be returned to a GM dealer for examination
and resolution of the problem.