Audio/video - Service Information: Overview Dodge Dakota III

DESCRIPTION

Several combinations of radio receivers and speaker systems are offered on this vehicle. The audio system receives fused battery current from a fuse in the Integrated Power Module (IPM). The audio system includes the following components

1. Antenna
2. Amplifier
3. Clockspring (with remote radio switches only)
4. Radio noise suppression components
5. Radio receiver
6. Remote radio switches (if equipped)
7. Speakers

OPERATION

The amplifier receives fused battery current from a fuse in the Integrated Power Module (IPM) at all times. The internal circuitry of the amplifier switches the amplifier on based upon a CAN bus message that is received from the radio receiver whenever the radio is turned on. The amplifier receives the sound signal inputs from the left and right rear outputs of the radio, then sends the amplified speaker outputs for each of those channels to the speakers.

The satellite radio antenna receives signals from orbiting satellites and sends these signals to the satellite receiver module. The satellite radio antenna must have open space in which to operate. Items carried on the roof, parking inside etc. can have an effect on the antenna's ability to receive signals.

Scheme 1

Scheme 2

1. Disconnect and isolate the battery negative cable.
2. Remove the headliner «(Refer to BODY/INTERIOR/HEADLINER - REMOVAL)»(ref-247640-S28080392912007020100000) .
3. Disconnect the antenna cables (1) from the antenna (2).
4. Remove the retaining fastener.
5. From inside the vehicle, and using a flat bladed tool, depress one of the retaining tabs on the antenna. Push up the one side of the antenna connector through the roof panel. Depress the other side of the connector and remove the antenna.

Scheme 3

Scheme 4

1. Insert wire harness through hole in roof panel. Press antenna into position until both retainers snap into place.
2. Install and tighten retaining fastener.
3. Connect antenna cable connectors (1) to antenna (2).
4. Install headliner «(Refer to BODY/INTERIOR/HEADLINER - INSTALLATION)»(ref-247640-S12806083362007020100000) .
5. Connect battery negative cable.

Scheme 5

Available radios include

1. AM/FM/CD (REF sales code)
2. AM/FM/6 disc CD/MP3 (RAQ sales code)
3. AM/FM/CD/RDS (RAR sales code) - export only

Scheme 6

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Scheme 8

1. Disconnect and isolate the battery negative cable.
2. Remove the instrument panel center bezel «(Refer to BODY/INSTRUMENT PANEL/INSTRUMENT PANEL CENTER BEZEL - REMOVAL)»(ref-247640-S21675726992007020100000) .
3. Remove the radio mounting fasteners. CAUTION: Pulling the antenna cable straight out of the radio without pulling on the locking antenna connector could damage the cable or radio.
4. Disconnect the antenna cable (3) by pulling the locking antenna connector (2) away from the radio (1).
5. Disconnect the electrical harness connector and remove radio.

Scheme 9

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Scheme 11

1. Connect the antenna cable (3) to radio.
2. Connect the electrical harness connector to the radio.
3. Position radio to instrument panel. Install and tighten mounting fasteners.
4. Install instrument panel center bezel «(Refer to BODY/INSTRUMENT PANEL/INSTRUMENT PANEL CENTER BEZEL - INSTALLATION)»(ref-247640-S19275792012007020100000) .

Radio noise suppression devices are installed 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 electromagnetic 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 manifested in the form of "buzzing," "hissing," "popping," "clicking," "crackling," and/or "whirring" sounds. In most cases, RFI and EMI radio noise can be suppressed using a combination of vehicle and component grounding, filtering and shielding techniques. This vehicle is equipped with radio noise suppression devices that were designed to minimize exposure to typical sources of RFI and EMI; thereby, minimizing radio noise complaints.

Radio noise suppression is accomplished primarily through circuitry or devices that are integral to the radios, audio power amplifiers and other on-board electrical components 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

1. Engine-to-bulkhead ground strap - This length of braided ground strap has an eyelet terminal connector crimped to each end. One end is secured to the engine cylinder heads. The other is secured to the bulkhead.
2. Resistor-type spark plugs - This type of spark plug has an internal resistor connected in series between the spark plug terminal and the center electrode to help reduce the production of electromagnetic radiation that can result in radio noise.
3. Exhaust-to-frame ground strap - This length of braided ground strap has an eyelet terminal connector crimped to each end. One end is secured to the exhaust pipe. The other is secured to the frame.

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 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.

Scheme 12

Scheme 13

1. Disconnect and isolate the battery negative cable.
2. Remove the mounting fasteners from the engine cylinder heads.
3. Remove mounting fastener from bulkhead and remove strap.

Scheme 14

1. Disconnect and isolate the battery negative cable.
2. Remove mounting fastener from exhaust pipe.
3. Remove mounting fastener from frame and remove ground strap.

Scheme 15

Scheme 16

1. Position ground strap to engine and install mounting fasteners.
2. Tighten mounting fasteners.
3. Position ground strap to bulkhead and install mounting fastener.
4. Tighten mounting fastener.
5. Connect battery negative cable.

Scheme 17

1. Position ground strap to exhaust pipe and install mounting fastener.
2. Tighten mounting fastener.
3. Position ground strap to frame and install mounting fastener.
4. Tighten mounting fastener.
5. Connect battery negative cable.

Scheme 18

The satellite receiver module on the club cab is located below the left rear passenger seat. It is mounted to the underside of the seat support with three mounting fasteners.

Scheme 19

The satellite receiver module on the quad cab is located in the left rear corner of the cab, under the rear seat. It is mounted to the floor panel with three mounting fasteners.

The satellite receiver module receives signals from the roof mounted antenna and processes this information before it is sent to the radio. The module operates on both battery feed circuits and CAN bus messages. It will operate with the ignition key in the run or accessory position only.

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Scheme 21

1. Disconnect and isolate the battery negative cable.
2. Remove the left side door scuff plate.
3. Raise carpet to access receiver.
4. Remove the mounting fasteners.
5. Disconnect the antenna and electrical harness connectors. Remove the module.

Scheme 22

1. Disconnect and isolate the battery negative cable.
2. Raise the left rear seat.
3. Remove the mounting fasteners.
4. Disconnect the antenna and electrical harness connectors. Remove the module.

Scheme 23

Scheme 24

1. Connect antenna and electrical harness connector to module.
2. Position module and install mounting fasteners. Tighten fasteners.
3. Lower carpet into position.
4. Install the left side door scuff plate.
5. Connect battery negative cable.

Scheme 25

1. Connect antenna and electrical harness connector to module.
2. Position module and install mounting fasteners. Tighten fasteners.
3. Lower the left rear seat.
4. Connect battery negative cable.

The six switches in the two remote radio switch units are normally open, resistor multiplexed momentary switches that are hard wired to the Instrument cluster through the clockspring. The instrument cluster 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 instrument cluster senses an input (voltage drop) from any one of the remote radio switches, it sends the proper switch status messages on the Controller Area Network (CAN) data bus to the radio. The electronic circuitry within the radio is programmed to respond to these remote radio switch status messages by adjusting the radio settings as requested.