Dodge RAM TRUCK 1500 1995 Service Manual page 675

B R
8W-47 AUDIO SYSTEM 8W - 47 - 1
AUDIO SYSTEM
GENERAL INFORMATION
Two radio systems are available in this vehicle; one
with a standard speaker system and a radio with
premium speaker system. The premium speaker sys­
tem uses a power amplifier and radio choke relay not
used on the standard system. When referencing the
circuit descriptions or the diagrams, ensure that you
use the correct ones.
RADIO OPERATION
In the ACCESSORY or RUN position, the ignition
switch connects circuit Al from fuse 3, a 40 amp, in
the Power Distribution Center (PDC) with circuit
A31. Circuit A31 powers a bus bar in the fuse block
that feeds circuit X12 through fuse 7, a 10 amp. Cir­
cuit X12 supplies battery voltage to the radio. Circuit
Z2 provides ground for the radio.
RADIO iEHORY
Circuit Ml from the Ignition Off Draw (IOD) fuse
(Fuse 17) in the fuse block supplies power for the ra­
dio memory. The IOD fuse is removed during vehicle
shipping to prevent excessive battery draw.
Circuit A7 from fuse 1, a 50 amp, in the Power Dis­
tribution Center (PDC) supplies voltage to the IOD
fuse. Circuit A7 is HOT at all times.
RADIO ILLUMINATION
When the parking lamps or headlamps are ON, cir­
cuits E2 and L7 from the headlamp switch power the
radio illumination lamps. Fuse 13, a 5 amp, in the
fuse block powers circuit E2 which feeds the radio il­
lumination lamp. Circuit El from the headlamp
switch supplies power to fuse 13. Circuit L7 supplies
voltage for the radio lamps. Circuit Z2 supplies the
ground path for the illumination and park lamp cir­
cuits.
RADIO CHOKE—PREMIUM RADIO ONLY
The radio choke relay supplies voltage to the am­
plifier circuits in the speakers. The radio supplies
power to the radio choke on circuit X60. Power for
the choke is also supplied on circuit Ml. This is the
Ignition-Off Draw (IOD) circuit and is protected by a
15 amp fuse located in cavity 17 of the fuse block.
Circuit Z2 provides ground for the radio choke.
When the radio supplies power for the choke, cir­
cuit X13 supplies voltage to the amplifier circuits in
the speakers.
SPEAKERS—STANDARD RADIO
Circuit X53 feeds the speaker in the left front door.
Circuit X55 is the return from the speaker to the ra­
dio.
Circuit X54 feeds the right front door speaker. Cir­
cuit X56 is the return from the speaker to the radio.
Circuit X51 feeds the speaker in the left rear of the
vehicle. Circuit X57 is the return from the speaker to
the radio.
Circuit X52 feeds the right rear speaker. Circuit
X58 is the return from the speaker to the radio.
SPEAKERS—PREMIUM RADIO
When the radio choke energizes, circuit X13 sup­
plies voltage to the amplifier circuits in each speaker.
Circuit Z2 provides the ground path for the speaker
amplifiers.
Circuit X53 feeds the speakers in the left front
door. Circuit X55 is the return from the speakers to
the radio.
Circuit X54 feeds the right front door speakers.
Circuit X56 is the return from the speakers to the ra­
dio.
Circuit X51 feeds the speaker in the left rear of the
vehicle. Circuit X57 is the return from the speaker to
the radio.
Circuit X52 feeds the right rear speaker. Circuit
X58 is the return from the speaker to the radio.
HELPFUL INFORMATION
• Check the 40 amp fuse located in cavity 3 of the
PDC
• Check the 10 amp fuse located in cavity 7 of the
fuse block
• Check the ground at the rear of the radio
• Check the IOD fuse in the fuse block
DIAGRAM INDEX
Component ^ Page
Fuse 1 (PDC) 8W-47-2, 4
Fuse 3 (PDC) .8W-47-2, 4
Fuse 7 (Fuse Block) 8W-47-2, 4
Fuse 13 (Fuse Block) . . .8W-47-2, 4
Fuse 18 (Fuse Block) 8W-47-2, 4
Fuse 17 (Fuse Block) 8W-47-2, 4
Headlamp Switch .8W-47-2, 4
Ignition Switch .8W-47-2, 4
Radio .8W-47-2 thru 7
Radio Choke 8W-47-5
Speakers—Premium Radio 8W-47-6, 7
Speakers—Standard Radio 8W-47-3