Dakota Quad Cab 4WD V6-3.9L VIN X (2001)
Front seat belt systems incorporate Tensioner Modules (SBT). At the onset of an impact event each tensioner uses a pyrotechnic device, which is
triggered simultaneously with the airbags, to rapidly retract the seat belts. With the slack removed, the occupant's forward motion in an impact
will. be reduced as will the likelihood of contacting interior components. After an impact that deploys the airbag, the seat belt tensioner assembly
must be replaced.
The ACM module monitors the Seat Belt Tensioners circuit resistance and reports active and stored DTC's if any problem is found.
Airbag Diagnostic Trouble Codes
Airbag diagnostic trouble codes consist of active and stored codes. If more than one code exists, diagnostic priority should be given to the active
codes.
Each diagnostic trouble code is diagnosed by following a specific testing procedure. The diagnostic test procedures contain step-by-step
instructions for 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 using the DRB III.
Active diagnostic trouble codes for the airbag system are not permanent and will change the moment the reason for the code is corrected. In certain
test procedures, diagnostic trouble codes are used as a diagnostic tool.
Active Codes
The code becomes active as soon as the malfunction is detected and stored after one minute of occurrence or key-OFF, whichever occurs first. An
active trouble code indicates an on-going malfunction. This means that the defect is currently there every time the airbag control module checks
that circuit function. It is impossible to erase an active code; active codes automatically erase by themselves when the reason for the code has been
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 ACM's memory after one minute of occurrence or when the ignition is turned OFF. The exception is
the "Loss of Ignition Run Only" code which is an active code only.
A "stored" code indicates there was an active code present at some time. However, the code currently may not be present as an active code,
although another active code could be.
When a trouble code indicates there was an active code present at some time. However, the code currently may not be present as an active code,
although another active code could be.
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 as long as the malfunction exists. 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, that diagnostic trouble code is erased and that ignition cycle counter is reset to zero. If the malfunction reoccurs before the
count reaches 100, then the ignition cycle counter will be reset and the diagnostic trouble code will continue to be a stored code.
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.
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
The factory installed radio receiver communicates on the Programmable Communication Interface (PCI) data bus network through a separate
two-way wire harness connector. This is used for the remote radio switches that are mounted to the steering wheel, and also used for radio
diagnosis with the DRB III.
The remote radio switches are resistor multiplexed units that are hard wired to the CTM through the clockspring. The CTM monitors the status of
the 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
