INTERIOR
-
Supplemental Restraint System (SRS)
6-25
14x029
Data to be stored
Faults
Fault duration
Number of times
memory can
be erased
Description
All faults stored in
diagnostic codes
The period the warning
light is ON is integrated in
minutes.
(Maximum stored period:
9999 minutes
S
7 days)
The number of times the
diagnostic codes and fault
durations
have been
erased by a scan tool is in-
tegrated.
(Maximum number of
times to be stored: 250)
3. Diagnostic 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 light is lit.
The microcomputer determines a diagnostic 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 light has been ON)
is integrated in increments of a minute and stored in the
EE-
PROM together with the diagnostic code. The stored data can
be read and erased by a scan tool. The number of times the
memory has been erased by a scan tool is stored in the
“EE-
PROM” to provide reference information on the past service
history. The data can be read by a scan tool in the same
way as the fault durations.
NOTE
Once a fault is detected, the SRS warning light continues
to light, even if normal operation of the system is restored,
until the diagnostic code is erased.
4. Automatic diagnostic code erasure function
The automatic diagnostic code erasure function operates
according to the indicated diagnostic code No. (Refer to
P.6-22).
Once the malfunction location that causes a diag-
nostic code to be displayed returns to the normal condition,
if the malfunction reoccurs continuously at
5-second
inter-
vals, the appropriate malfunction code can be erased. At
this time, if all other diagnostic codes have been erased,
the SRS warning light will switch off and the intermittent
durations of the malfunction will also be erased automatical-
ly. In this case, the erasure is not included in the number
of times erased.
NOTE
If the A/D converter inside the SRS diagnostic unit is mal-
functioning, diagnostic codes No. 41, 42 and 43 will not
be erased by the automatic diagnostic code erasure func-
tion. Furthermore, during cranking, none of the codes will
be erased by this function.
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