3. Diagnosis function
Fault diagnosis continues to be performed during the period the
ignition switch is ON except during cranking. If a fault is
detected, the SRS warning lamp is lit.
The microcomputer determines a diagnosis code on the basis of
the results of measurements by various measuring circuits and
stores it in "EEPROM".
The fault duration (the period the warning lamp has been ON) is
integrated in increments of a minute and stored in the EEPROM
together with the diagnosis code. The stored data can be read
and erased by a Multi-use tester. The number of times the
memory has been erased by a Multi-use tester is stored in the
"EEPROM" to provide reference information on the past service
history. The data can be read by a Multi-use tester in the same
way as the fault durations.
NOTE
Once a fault is detected, the SRS warning lamp con-
tinues to lamp, even if normal operation of the system is
restored, until the diagnosis code is erased.
INTERIOR - Supplemental Restraint System (SRS) 6-25
4.
utomatic diagnosis code erasure function
The Automatic diagnosis code erasure function
operates according to the indicated diagnosis code
No. (Refer to P.6-23). Once the malfunction location
that causes a diagnosis code to be displayed
returns to the normal condition, if the malfunction
reoccurs continuously at 5-second intervals, the
appropriate malfunction code can be erased. At this
time, if all other diagnosis codes have been erased,
the SRS warning lamp will switch off and the
intermittent durations of the
malfunction will also be erased automatically. In this
case, the erasure is not included in the number of
times erased.
NOTE
If the AID converter inside the SRS diagnosis unit is
malfunctioning, diagnosis codes No. 41, 42 and 43
will not be erased by the automatic diagnosis code
erasure function. Furthermore, during cranking,
none of the codes will be erased by this function.
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