Dakota Quad Cab 2WD V8-5.9L VIN Z LDC (2002)
remote radio switches and sends the proper switch status messages on the PCI data bus network to the radio receiver. The electronic circuitry within
the radio is programmed to respond to these remote radio switch status messages by adjusting the radio settings as requested.
When troubleshooting output shorts or "output" error messages, the following applies:
On radios without an external amplifier, the term "output" refers to the path between the radio and the speaker. This type of circuit can be monitored
all the way through the speaker connections by the radio assembly. When the radio displays a shorted output DTC with this type of system, the
speaker, radio or wiring could be at fault.
On radios with an external amplifier, the term "output" refers to the circuit between the radio connector and the amplifier. The radio is capable of
monitoring only this portion and can tell nothing about the circuit between the amplifier and the speakers. Consequently, a shorted output DTC on this
type of system would only refer to this circuit. A faulty speaker could not cause this DTC.
Amplifier (Premium System)
The Premium Audio Amplifier uses a microprocessor for audio Digital Signal Processing (DSP) and system diagnostics. DSP provides a more
accurate and consistent match of the audio system equalization to the vehicle interior. The O2 AN/AN84 Dakota amplifier has four channels for
superior sound quality.
The amplifier reads the VIN from the PCI bus and sets itself to match the vehicle. The amplifier will send four beeps to the vehicle speakers at ignition
ON, if it does not read the VIN correctly. A replacement amplifier may beep at the first power up, but if these beeps are heard after the first ignition
ON, the DRB III should be used to verify the amplifier is connected to the PCI bus and that the VIN on the PCI bus is correct.
The amplifier, wiring to the speakers and the speakers work independently from the radio. The amplifier's microprocessor supports several diagnostic
functions. Tests can be run from the DRB III that will help in diagnosing audio system problems. The DRB III can display fault messages when an
input or output problem to the amplifier is detected. The amplifier can detect wiring shorts and suggest which wires are likely to be shorted. The
amplifier can send test signals that can be used to verify that the amplifier, speakers, and wiring to the speakers are operating properly. The amplifier
can also be used to test if the radio is sending audio signals to it. The DRB III can be used to verify the amplifier equalization setting matches the
vehicle, in case there is a sound quality complaint. Using the DRB III audio system diagnostics can determine the nature of the problem.
Diagnostic test the Amplifier can perform through the DRB III:
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Continuous Tone Test - This test will send a continuous tone to each speaker and will verify the integrity of an individual channel.
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PCI Amplifier Test - This test will detect a PCI bus or checksum failure.
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Input Test - This test will detect the activity on the amplifiers input channels from the radio.
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Speaker Output Test - This test will detect the activity on the amplifiers output channels to the speakers.
Central Timer Module
CENTRAL TIMER MODULE
The Dakota (AN) and (AN84) utilize a Central Timer Module (CTM). This system is available in a Base or Highline configuration.
The CTM performs most of the typical functions a Body Control Module would perform.
The Base and Highline CTM provides the following features:
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Battery Saver Functions For Exterior and Interior Lamps
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Cargo Lamps
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Chime Warning
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Courtesy Lamps
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Dome Lamps
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Dome Defeat
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Door Ajar Switch Status
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Fog Lamps
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Head Lamp Time Delay
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Intermittent Wiper Controls
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Low and High Beam Head Lamps
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Optical Horn
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Park Lamps
Additional features of Highline CTM
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Central Locking (VTSS)
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Door Lock Inhibit
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Driver Door Unlock
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Enhanced Accident Response
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Power Door Locks
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Remote Radio
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Remote Keyless Entry
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Vehicle Theft Alarm (VTSS)
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Horn Chirp
