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needed). Then follow all of the safety procedures in
the service information for connecting airbag sys-
tem components. Read the module active DTC's. If
the module reports NO ACTIVE DTC's the defective
component has been removed from the system and
should be replaced. If the DTC is still active, con-
tinue this process until all components in the circuit
have been tested. Then disconnect the module con-
nector and connect the matching adapter to the
module connector. With all airbags disconnected
and the adapter installed the squib wiring can be
tested for open and shorted conditions.
3.1.8 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 diagnos-
tic 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.
Then begin diagnostic with the Table of Contents
section 7.0. This will direct you to the specific test(s)
that must be performed. Most active diagnostic
trouble codes for the airbag system are not perma-
nent and will change the moment the reason for the
code is corrected. In certain test procedures within
this manual, diagnostic trouble codes are used as a
diagnostic tool.
3.1.9 ACTIVE CODES
The code becomes active as soon as the malfunc-
tion is detected or key-in, whichever occurs first. An
active trouble code indicates an on-going malfunc-
tion or has occurred in that ignition cycle. This
means that the defect is currently there every time
the airbag control module checks that circuit or
component. It is impossible to erase an active code.
Active codes automatically erase by themselves
when the reason for the code has been corrected or
NOT present in the subsequent ignition cycle. 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.
3.1.10 STORED CODES
Airbag codes are automatically stored in the
ACM's memory as soon as the malfunction is de-
tected. A stored code indicates there was an active
code present at some time. However, the code cur-
rently may not be present as an active code. When
a trouble code occurs, the airbag warning indicator
illuminates for 12 seconds minimum (even if the
GENERAL INFORMATION
problem existed for less than 12 seconds). The code
is stored, along with the time in minutes it was
active, and the number of times the ignition has
been cycled since the problem was last detected.
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 malfunc-
tion is detected a diagnostic trouble code is stored
and will remain stored. When and if the malfunc-
tion 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. 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 diagnos-
tic test will not locate the source of the problem. In
this case, the stored code can indicate an area to
inspect. It 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 periodi-
cally as you work through the system. This proce-
dure may uncover a malfunction that is difficult to
locate.
3.2 AUDIO SYSTEM
Some radio systems available on the JR commu-
nicate on the PCI Bus. They use the bus for four
reasons. The first is to communicate trouble codes,
second is to receive dimming information, third is to
receive cabin equalization information and fourth is
to control the remote radio switches located on the
back of the steering wheel. The audio system is
available in a 4 speaker or 6 speaker base system
and a 6 speaker system with an external power
amplifier. An in-dash CD Changer is also optional.
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
7
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