Cherokee 4WD L6-4.0L VIN S (1998)
Airbag diagnostic trouble codes consist of active and stored codes. If more than one code exists, diagnostic priority should be given to the active code(s).
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 to diagnose an individual code.
Always begin by reading the diagnostic trouble codes using the DRB. This procedure begins with AIR-BAG TEST 1 A - Identifying Airbag System
Problems. This will direct you to the specific test(s) that must be performed. If more than one code exists, diagnostic priority should be given to the
active code(s).
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
An active trouble code indicates an ongoing 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 1 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 occurs, the AIRBAG warning lamp illuminates for 12 seconds minimum (even if the 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 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 recurrence of that same
malfunction, that diagnostic trouble code is erased and that ignition cycle counter is reset to zero. If the malfunction recurs 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. With the ignition "on," wiggle the wire harness and connectors, then 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.
Airbag Trouble Codes
The airbag control module may report any of the following diagnostic trouble codes.
For the following active or stored codes, replace the Airbag Control Module (ACM):
^
AECM Accelerometer
^
Internal Diagnostic 1
^
Internal Diagnostic 2
^
AECM Output Driver
^
AECM Stored Energy Logic
^
AECM Stored Energy Driver
^
AECM Stored Energy Passenger
^
Internal Diagnostic 4
^
Sating Sensor Shorted
For these codes, refer to the appropriate diagnostic procedure:
^
Driver Squib Circuit Open
^
Driver Squib Circuit Shorted
