Dodge ram truck 3500 1996 Service Manual page 445

AUDIO SYSTEMS 8F - 1
AUDIO SYSTEMS
C O N T E N T S
page
GENERAL INFORMATION
INTRODUCTION 1
DESCRIPTION AND OPERATION
ANTENNA 2
FILTER CHOKE/SPEAKER RELAY 1
IGNITION-OFF DRAW FUSE 1
RADIO NOISE SUPPRESSION 2
RADIOS 1
SPEAKERS 1
DIAGNOSIS AND TESTING
ANTENNA 5
page
AUDIO SYSTEM 3
FILTER CHOKE/SPEAKER RELAY 5
RADIO FREQUENCY INTERFERENCE 6
RADIO 4
SPEAKERS 4
REMOVAL AND INSTALLATION
ANTENNA 9
FILTER CHOKE/SPEAKER RELAY 9
RADIO 6 r~
SPEAKERS 7 " '
G E N E R A L I N F O R M A T I O N
INTRODUCTION
Following are general descriptions of the major
components used in both the standard and optional
equipment audio systems. Refer to 8W-47 Audio Sys­
tem in Group 8W - Wiring Diagrams for complete cir­
cuit descriptions and diagrams.
D E S C R I P T I O N A N D
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RADIOS
Radio options include an AM/FM, an AM/FM/cas-
sette, an AM/FM/CD, or an AM/FM/cassette with
graphic equalizer. All receivers are stereo Electroni­
cally Tuned Radios (ETR) and include a clock func­
tion. For more information on radio features, setting
procedures, and control functions refer to the Sound
System manual. The Sound System manual is
included with the owner's manual in the vehicle
glove box.
IGNITION-OFF DRAW FUSE
All vehicles are equipped with an Ignition-Off
Draw (IOD) fuse that is removed when the vehicle is
shipped from the factory. This fuse feeds various
accessories that require current when the ignition
switch is in the Off position, including the clock and
radio station preset memory functions. The fuse is
removed to prevent battery discharge during vehicle
storage.
When removing or installing the IOD fuse, i t is
important that the ignition switch be in the Off posi­
tion. Failure to place the ignition switch in the Off
position can cause the radio display to become scram­
bled when the IOD fuse is removed and replaced.
Removing and replacing the IOD fuse again, with the
ignition switch in the Off position, will correct the
scrambled display condition.
The IOD fuse should be checked i f the radio station
preset memory or clock functions are erratic or inop­
erative. The IOD fuse is located in the fuseblock
module. Refer to the fuseblock module label for IOD
fuse identification and location.
SPEAKERS
Speaker system options include two or four
speaker locations. On two-speaker systems, one full-
range speaker is located in each front door. Four-
speaker systems add one full-range speaker in each
rear cab side panel.
The premium speaker option upgrades all the
speakers in the above locations to Infinity bi-ampli-
fied models. Infinity coaxial speakers are mounted in
the rear cab side panels. Each front door has two
separate Infinity speakers, a woofer and a tweeter.
Each Infinity woofer features an integral amplifier
and frequency filter unit. The amplifier of the radio
is used to drive the tweeters at each speaker loca­
tion. The speaker-mounted amplifiers drive the woof­
ers at each speaker location.
FILTER CHOKE/SPEAKER RELAY
Models equipped with the Infinity premium
speaker package use this choke/relay to control bat­
tery feed to the speaker-mounted amplifiers. The
choke/relay is mounted to the center lower instru­
ment panel brace to the right of the knee blocker
opening. The choke/relay can be accessed by remov-