Reading Diagnostic Trouble Codes DTC(s) With a Scan Tool
The recommended method for reading DTC(s) stored in the memory seat
modules memory is by using a scan tool plugged into the DLC connector (located
under the instrument panel on the right side). Follow the scan tool instructions
supplied by the tool manufacturer. The DTC(s) will be stored in the memory
of the memory seat module as a Current or a History DTC.
Current Codes
The memory seat module will set the code as a current DTC under the
following conditions:
| • | The memory seat module determines that the test conditions and
failure conditions for a particular DTC are true. |
| • | A current ignition cycle occurs. |
All DTC(s) remain current until the following conditions exist:
| • | The next fault-free ignition cycle occurs. |
| • | The memory seat module determines that the test conditions are
true. |
| • | The memory seat module determines that the failure conditions
are false. |
The Current code then will become a History code only when the above
conditions exist.
History Codes
When a DTC reports a failure and the failure was not in the current
ignition cycle, the DTC will be stored as a history code. The memory seat
module performs internal diagnostic tests in order to acknowledge that the
related systems have reported a pass or fail condition. Each diagnostic test
that fails is recorded in the memory seat module memory. The memory seat
module memory may be accessed with a scan tool in order to determine which
DTC circuit was at fault. A history DTC may be cleared (for any diagnostic
test) by performing any of the following procedures:
| • | Cycle the ignition with no diagnostic test reporting
a fail. |
| | Important: Disconnecting the battery or memory seat module connector will clear
all current and history memory seat module DTC(s).
|
| • | Disconnect the battery. |
| • | Disconnect the memory seat module connector. |
After Diagnosis is Complete
After diagnosing a problem, in addition to repairing the discovered
malfunction, clear any DTC(s) set and verify proper operation. In order to
verify proper operation, you must duplicate the conditions when the customer's
complaint occurred. If a DTC was set, you must duplicate the test conditions
for that DTC (listed on the Diagnostic Trouble Code table). The DTC should
not re-set after the repair has been completed.
