Pacifica V6-3.8L VIN L (2005)
determining the cause of the trouble codes. It is not necessary to perform all of the tests in this book to diagnose an individual code. Always begin by
reading the diagnostic trouble codes with the DRBIII(R). This will direct you to the specific test(s) that must be performed. In certain test procedures
within this manual, diagnostic trouble codes are used as a diagnostic tool.
ACTIVE CODES
The code becomes active as soon as the malfunction is detected or key-on, whichever occurs first. An active trouble code indicates an on-going
malfunction. This means that the defect is currently there every time the Occupant Restraint Controller checks that circuit or component. It is impossible
to erase an active code. Active diagnostic trouble codes for the airbag system are not permanent and will change the moment the reason for the code is
corrected. With the exception of the warning lamp trouble codes or malfunctions, when a malfunction is detected, the airbag lamp remains lit for a
minimum of 12 seconds or as long as the malfunction is present.
STORED CODES
Airbag codes are automatically stored in the ORC's memory as soon as the malfunction is detected. A stored code indicates there was an active code
present at some time. When a trouble code occurs, the Airbag Warning Indicator illuminates for 12 seconds minimum (even if the problem existed for
less than 12 seconds). Once the code is no longer active, the time in minutes it was active, and the number of times the ignition has been cycled since the
problem was last detected will be displayed. The minimum time shown for any code will be one minute, even if the code was actually present for less
than one minute. Thus, the time shown for a code that was present for two minutes 13 seconds, for example, would be three minutes. If a malfunction
is detected a diagnostic trouble code is stored and will remain stored. When and if the malfunction ceases to exist, an ignition cycle count will be
initiated for that code. If the ignition cycle count reaches 100 without a reoccurrence of the same malfunction, the diagnostic trouble code is erased and
that ignition cycle counter is reset to zero. The ignition cycle counter will be reset and diagnostic trouble code will continue to be a stored code, If the
malfunction reoccurs before the count reaches 100. If a malfunction is not active while performing a diagnostic test procedure, the active code diagnostic
test will not locate the source of the problem. In this case, the stored code can indicate an area to inspect. Maintain a safe distance from all airbags while
performing the following inspection. If no obvious problems are found, erase stored codes, and with the ignition on wiggle the wire harness and
connectors, rotate the steering wheel from stop to stop. Recheck for codes periodically as you work through the system. This procedure may uncover a
malfunction that is difficult to locate.
Audio System
Both the RAH and RBP radios are on the PCI Bus system. The audio output signal from the radios, on these central amplifier systems, is fixed at one
volume level (level 25 for RAH and 26 for RBP). The actual volume, fade, balance, and tone adjustments are managed via messages sent over the PCI
Bus from the radio to the amplifier which changes its speaker outputs to the corresponding settings. The amplifiers will also adjust volume based on
speed messages received over the bus from the PCM. This keeps the sound level essentially constant relative to the interior noise level at all driving
speeds.
Both the 6-channel base amplifier and the 8-channel surround sound amplifier perform digital signal processing and contain unique equalization curves
in their memory. The specific audio source determines how the amplifier equalizes the individual channel outputs. Separate EQ's are provided for AM
radio, FM radio, Tape, CD, and DVD video. There is a sixth EQ "slot" available for a TBD future input source. Audio signal EQ selection is based on
bus messages received from the radio and Navigation unit. For example, DVD video is equalized for viewing video in the second and third row seats.
Hands-free audio is processed using the AM radio EQ. Navigation audio is processed based on the current audio source EQ. The amplifier allows audio
inputs from navigation and hands-free module to override whatever else might be playing at the time. The amplifier provides an independent output
channels to each speaker location: 1) left front door, 2) right front door, 3) I/P center, 4) right rear door and 5) left rear door. On eight channel systems
the amplifier provides two output (6 and 7) to a dual voice coil subwoofer. Both amplifiers contain diagnostic software allowing them to display
Diagnostic Trouble Codes (DTCs) and perform certain diagnostic tests using the DRBIII(R). The tests available are the:
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Input Test - monitors input sources.
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PCI Amplifier Test - detect a checksum failure
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Identify EQ - displays the EQ currently being output by the amp (AM, FM, Tape, CD, DVD video).
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Continuous Tone Test - outputs a low and high note to each speaker (starts at the driver's door and proceeds clockwise around the vehicle).
REMOTE RADIO CONTROLS
These radios can be controlled via remote radio switches (optional). These switches are located on the back side of the steering wheel. They control
mode, preset, seek up, seek down, volume up and volume down functions.
These functions are inputs to the Body Control Module and can be read with the DRBIII(R) under "body computer". The switches are a multiplexed
signal to the BCM. The radio control MUX circuit is a 5 volt line that is pulled to ground through different value resistors built into the switches. This
causes the BCM to see a voltage drop and it sends a specific message to the radio on the PCI Bus circuit. The radio then responds to the message.
This circuit is fairly simple to troubleshoot. The circuit must be complete from the switches in the steering wheel to the BCM. The ground must be
complete so that the switches can cause the voltage drop for the BCM to see. The circuit passes through the clockspring so continuity through this devise
must be verified.
CD/DVD CHANGER
The 6 disc In-dash CD/DVD Changer is designed to fit into the existing cubby bin in the center stack. This new cartridge-less CD/DVD Changer is
controlled by your radio, and allows you to individually load up to 6 discs at a time. However, due to its compact design, the CD/DVD Changer can only