Removal; Installation; Radio Noise Suppression Components Description; Operation - Chrysler PT Cruiser Service & Repair Manual

8A - 8 AUDIO
RADIO (Continued)

REMOVAL

(1) Disconnect and isolate the battery negative cable.
(2) Remove instrument panel center bezel.
(3) Remove mounting fasteners and remove radio
from instrument panel (Fig. 6).
Fig. 6 Radio Remove/Install
(4) Disconnect wire harness connector from radio.
CAUTION: Pulling the antenna cable straight out of
the radio without pulling on the locking antenna
connector could damage the cable or radio.
(5) Disconnect the antenna cable by pulling the lock-
ing antenna connector away from the radio (Fig. 7).
Fig. 7 ANTENNA TO RADIO
1 - RADIO
2 - LOCKING ANTENNA CONNECTOR
3 - INSTRUMENT PANEL ANTENNA CABLE

INSTALLATION

(1) Connect the wire
antenna cable to radio.
(2) Insert radio into instrument panel.
(3) Install mounting fasteners. Tighten to 2 N·m
(20 in. lbs.).
(4) Install instrument panel center bezel.
(5) Connect battery negative cable.
harness connector and
RADIO NOISE SUPPRESSION
COMPONENTS
DESCRIPTION
Radio noise suppression devices are factory-in-
stalled standard equipment on this vehicle. Radio
Frequency Interference (RFI) and ElectroMagnetic
Interference (EMI) can be produced by any on-board
or external source of electromagnetic energy. These
electromagnetic energy sources can radiate electro-
magnetic signals through the air, or conduct them
through the vehicle electrical system.
When the audio system converts RFI or EMI to an
audible acoustic wave form, it is referred to as radio
noise. This undesirable radio noise is generally man-
ifested in the form of "buzzing," "hissing," "popping,"
"clicking," "crackling," and/or "whirring" sounds. In
most cases, RFI and EMI radio noise can be sup-
pressed using a combination of vehicle and compo-
nent grounding, filtering and shielding techniques.
This vehicle is equipped with factory-installed radio
noise suppression devices that were designed to min-
imize exposure to typical sources of RFI and EMI;
thereby, minimizing radio noise complaints.
Factory-installed radio noise suppression is accom-
plished primarily through circuitry or devices that
are integral to the factory-installed radios, audio
power amplifiers and other on-board electrical com-
ponents such as generators, wiper motors, blower
motors, and fuel pumps that have been found to be
potential sources of RFI or EMI. External radio noise
suppression devices that are used on this vehicle to
control RFI or EMI, and can be serviced, include the
following:
• Ground straps - This length of braided ground
strap has an eyelet terminal connector crimped to
each end. They are located in various locations on
the vehicle.
• Radio Noise Suppression Capacitor - This
component is attached near the exhaust manifold.
• Resistor-type spark plugs - This type of spark
plug has an internal resistor connected in series
between the spark plug terminal and the center elec-
trode to help reduce the production of electromag-
netic radiation that can result in radio noise.

OPERATION

There are two common strategies that can be used
to suppress Radio Frequency Interference (RFI) and
ElectroMagnetic Interference (EMI) radio noise. The
first suppression strategy involves preventing the
production of RFI and EMI electromagnetic signals
at their sources. The second suppression strategy
involves preventing the reception of RFI and EMI
PT