Dodge 2000 DURANGO Service Manual page 342

8F - 2 AUDIO SYSTEMS
DESCRIPTION AND OPERATION (Continued)
on the steering wheel through a hard wired circuit.
The CTM then sends the proper switch status mes-
sages to the radio receiver. The electronic circuitry
within the radio receiver responds to the switch sta-
tus messages it receives by adjusting the radio set-
tings as requested.
Refer to Central Timer Module in the Descrip-
tion and Operation section of Group 8E - Instrument
Panel Systems for more information on the high-line
CTM. Refer to Remote Radio Switch in the
Description and Operation section of this group for
more information on this component. In addition,
radio receivers connected to the CCD data bus have
several audio system functions that can be diagnosed
using a DRB scan tool. Refer to the proper Diagnostic
Procedures manual for more information on DRB
testing of the audio systems.
RADIO RECEIVER
DESCRIPTION
Available factory-installed radio receivers for this
model include an AM/FM/cassette (RAS sales code),
an AM/FM/cassette/5-band graphic equalizer with CD
changer control feature (RBN sales code), an AM/FM/
CD/3-band graphic equalizer (RBR sales code), or an
AM/FM/CD/cassette/3-band graphic equalizer (RAZ
sales code). The factory-installed RAZ sales code
radio receivers can also communicate on the Chrysler
Collision Detection (CCD) data bus network through
a separate two-way wire harness connector. All facto-
ry-installed receivers are stereo Electronically Tuned
Radios (ETR) and include an electronic digital clock
function.
These radio receivers can only be serviced by an
authorized radio repair station. See the latest War-
ranty Policies and Procedures manual for a current
listing of authorized radio repair stations.
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 battery current when the
ignition switch is in the Off position, including the
clock. The IOD fuse is removed to prevent battery
discharge during vehicle storage.
When removing or installing the IOD fuse, it 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 if the radio or
clock displays are inoperative. The IOD fuse is
located in the junction block. Refer to the fuse layout
label on the back of the instrument panel fuse access
panel for IOD fuse identification and location.
OPERATION
The radio receiver operates on fused battery cur-
rent that is available only when the ignition switch is
in the On or Accessory positions. The electronic digi-
tal clock function of the radio operates on fused bat-
tery current supplied
regardless of the ignition switch position.
For more information on the features, setting pro-
cedures, and control functions for each of the avail-
able factory-installed radio receivers, see the owner's
manual in the vehicle glove box. For complete circuit
diagrams, refer to Audio System in the Contents of
Group 8W - Wiring Diagrams.
REMOTE RADIO SWITCH
DESCRIPTION
A remote radio switch option is available on models
equipped with the
graphic equalizer (RAZ sales code) radio receiver and
the high-line Central Timer Module (CTM). Refer to
Central Timer Module in the Description and
Operation section of Group 8E - Instrument Panel
Systems for more information on this component.
Two rocker-type switches (Fig. 1) are mounted in
the sides of the rear (instrument panel side) steering
wheel trim cover. The switch on the left side is the
seek switch and has seek up, seek down, and preset
station advance functions. The switch on the right
side is the volume control switch and has volume up,
and volume down functions. The two switches are
retained in mounting holes located on each side of
the rear steering wheel trim cover by four latches
that are integral to the switches.
The remote radio switches share a common steer-
ing wheel wire harness with the vehicle speed control
switches. The steering wheel wire harness is con-
nected to the instrument panel wire harness through
the clockspring. Refer to Clockspring in the
Description and Operation section of Group 8M -
Passive Restraint Systems for more information on
this component.
OPERATION
The remote radio switches are resistor multiplexed
units that are hard wired to the high-line CTM
through the clockspring. The CTM monitors the sta-
tus of the remote radio switches and sends the
proper switch status messages on the Chrysler Colli-
sion Detection (CCD) data bus network to the radio
through the IOD
AM/FM/CD/cassette/3-band
DN
fuse,