Dodge Nitro. Manual - part 306

OPERATION

RADIO NOISE SUPPRESSION COMPONENTS

There are two common strategies that can be used to suppress Radio Frequency Interference (RFI) and Electro
Magnetic 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 electromagnetic signals by the audio system components.

The use of braided ground straps in key locations is part of the RFI and EMI prevention strategy. These ground
straps ensure adequate ground paths, particularly for high current components such as many of those found in
the starting, charging, ignition, engine control and transmission control systems. An insufficient ground path for
any of these high current components may result in radio noise caused by induced voltages created as the high
current seeks alternative ground paths through components or circuits intended for use by, or in close proximity
to the audio system components or circuits.

Preventing the reception of RFI and EMI is accomplished by ensuring that the audio system components are
correctly installed in the vehicle. Loose, corroded or improperly soldered wire harness connections, improperly
routed wiring and inadequate audio system component grounding can all contribute to the reception of RFI and
EMI. A properly grounded antenna body and radio chassis, as well as a shielded antenna coaxial cable with
clean and tight connections will each help reduce the potential for reception of RFI and EMI.

REMOVAL

RADIO NOISE SUPPRESSION COMPONENTS

1. Disconnect and isolate the battery negative cable.

2. Remove the retaining bolt from the transmission bell housing.

3. Remove the retaining nut from the plenum.

INSTALLATION

RADIO NOISE SUPPRESSION COMPONENTS

1. Install the retaining nut and ground strap to the plenum.

2. Install retaining bolt to the transmission bell housing.

3. Connect the battery negative cable.

REMOTE SWITCHES

DESCRIPTION

REMOTE SWITCHES

Radio controls are mounted on the back of the steering wheel. The controls provide convenient no-look
operation and operate the following functions:

2007 Dodge Nitro R/T

2007 ACCESSORIES AND EQUIPMENT Audio/Video - Service Information - Nitro

Right side

A rocker switch that increases or decreases the volume

A push button that selects modes. Repeatedly pressing the button selects from among AM radio,
FM radio and CD changer. If the vehicle is equipped with Satellite Digital Audio Radio (SDAR) or
the Video Entertainment System™, these are also included in the selection.

Left side

A rocker switch with functions that vary depending on the mode: in a radio mode, the frequency
increases or decreases; if a CD is playing, the player skips to the next or previous track; if SDAR is
playing the tuner skips to the next or previous channel.

A push button that steps through preset selections: if the radio is playing, pressing the button selects
the next preset frequency; if a CD is playing, the changer selects the next disc; if SDAR is playing
the next preset channel is selected.

OPERATION

REMOTE SWITCHES

The six switches in the two remote radio switch units are normally open, resistor multiplexed momentary
switches that are hard wired to the Cab Compartment Node (CCN) through the clockspring. The CCN sends a
five volt reference signal to both switch units on one circuit, and senses the status of all of the switches by
reading the voltage drop on a second circuit.

When the CCN senses an input (voltage drop) from any one of the remote radio switches, it sends the proper
switch status messages on the Controlled Area Network (CAN) to the radio receiver. The electronic circuitry
within the radio receiver is programmed to respond to these remote radio switch status messages by adjusting
the radio settings as requested. For diagnosis of the CCN or the CAN data bus, the use of a scan tool and the
proper Diagnostic article are recommended.

DIAGNOSIS AND TESTING

REMOTE SWITCHES

Any diagnosis of the Audio system should begin with the use of scan tool. For information on the use of
the scan tool, refer to the appropriate Diagnostic information.

For complete circuit diagrams, refer to the appropriate wiring information.

WARNING:

Disable the airbag system before attempting any steering wheel, steering
column, seat belt tensioner, side airbag, or instrument panel component
diagnosis or service. Disconnect and isolate the battery negative (ground)
cable, then wait two minutes for the airbag system capacitor to discharge
before performing further diagnosis or service. This is the only sure way
to disable the airbag system. Failure to take the proper precautions could
result in accidental airbag deployment and possible personal injury.

2007 Dodge Nitro R/T

2007 ACCESSORIES AND EQUIPMENT Audio/Video - Service Information - Nitro

1. Disconnect and isolate the battery negative cable. Remove the remote radio switch(es) from the steering

wheel. See REMOVAL.

2. Use an ohmmeter to check the switch resistances as shown in the Remote Radio Switch Test chart. If the

remote radio switch resistances check OK, go to step 3. If not OK, replace the faulty switch.

REMOTE RADIO SWITCH TEST TABLE

3. Reconnect the battery negative cable. Turn the ignition switch to the On position. Check for 5 volts at the

radio control mux circuit cavities of the steering wheel wire harness connectors for both remote radio
switches. If OK, go to step 4. If not OK, repair the open or shorted radio control mux circuit as required.

4. Disconnect and isolate the battery negative cable. Disconnect the 22-way instrument panel wire harness

connector from the CCN. Check for continuity between the remote radio switch ground circuit cavities of
the steering wheel wire harness connectors for both remote radio switches and a good ground. There
should be no continuity. If not OK, repair the shorted remote radio switch ground circuit as required.

REMOVAL

REMOTE SWITCHES

1. Disconnect and isolate the battery negative cable.

2. Remove the driver side airbag from the vehicle. Refer to REMOVAL .

3. Remove the speed control switches.

4. Unplug the wire harness connector from the remote radio switch.

5. Depress the tabs on each side of each switch and push the switch through the rear steering wheel cover.

INSTALLATION

REMOTE SWITCHES

Switch

Switch Position

Resistance

Right (White)

Volume Up

1.210 Kilohms ± 1%

Right (White)

Volume Down

3.010 Kilohms ± 1%

Right (White)

Mode Advance

0.0511 Kilohms ± 1%

Left (Black)

Seek Up

0.261 Kilohms ± 1%

Left (Black)

Seek Down

0.681 Kilohms ± 1%

Left (Black)

Pre-Set Station Advance

0.162 Kilohms ± 1%

WARNING:

2007 Dodge Nitro R/T

2007 ACCESSORIES AND EQUIPMENT Audio/Video - Service Information - Nitro

1. Install remote radio switch to the steering wheel.

2. Connect the wire harness to the remote radio switch.

3. Install the speed control switches.

4. Install the driver side airbag. Refer to INSTALLATION .

5. Connect the battery negative cable.

SPEAKER

DESCRIPTION

SPEAKER

STANDARD

The standard equipment speaker system includes speakers in six locations. One 6.4 centimeter (2.50 inch)
diameter speaker is installed on each end of the instrument panel top pad. One 16.5 centimeter (6.5 inch) full-
range speaker is located in each front door. There is also one full-range 16.5 centimeter (6.5 inch) diameter full-
range speaker located in each rear door.

PREMIUM

The optional premium speaker system features nine Premium model speakers. Each of the standard speakers are
replaced with Premium model speakers. One 6.4 centimeter (2.50 inch) diameter speaker is installed on each
end of the instrument panel top pad. One 16.5 centimeter (6.5 inch) Premium woofer is located in each front
door. There is also one full-range 16.5 centimeter (6.5 inch) diameter Premium full-range speaker located in
each rear door as well as one 1.9 centimeter (.75 inch) tweeter in each rear door. A 20.3 centimeter (8 inch)
subwoofer is located in the rear cargo area. The premium speaker system also includes a power amplifier rated
at 368 watts.

OPERATION

SPEAKER

Two wires connected to each speaker, one feed circuit (+) and one return circuit (-), allow the audio output
signal electrical current to flow through the voice coil. For complete circuit diagrams, refer to the appropriate
wiring information. The wiring information includes wiring diagrams, proper wire and connector repair
procedures, details of wire harness routing and retention, connector pin-out information and location views for
the various wire harness connectors, splices and grounds.

WARNING:

2007 Dodge Nitro R/T

2007 ACCESSORIES AND EQUIPMENT Audio/Video - Service Information - Nitro

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