7-26
EQUIPMENT
-
ETACS
SEAT BELT WARNING TIMER FUNCTION
<Warning
light>
(1)
Placing the ignition switch to the ON position
will apply the H signal of the ignition switch
and the H signal of constant voltage circuit to
AND. Then AND outputs the H signal to operate
the timer circuit.
(2) The timer output turns the transistor Trl ON
and OFF alternately four times in six seconds
<Buzzer>
(1) Placing the ignition switch in the ON position
will apply the L signal inverted by
NOT,
to NOR.
If the seat belt is not worn at this time (seat
belt buckle switch OFF), the L signal inverted
by
NOT2
is applied to NOR. As a result, NOR
outputs the H signal and operates the timer
circuit. The buzzer output turns on the transistor
Tr2 and sounds the buzzer intermittently for
Ignition switch (IGl)
f
-
and seat belt warning lamp blinks to remind
the driver of wearing the seat belt.
(3) If the ignition switch is turned OFF while the
timer is in operation, the H signal of the ignition
switch mentioned in (1) above changes to the
L signal to stop the timer circuit operation and
to turn off the warning light.
six seconds to remind the driver of wearing
the seat belt.
(2) If, during timer operation, the seat belt is worn
(seat belt buckle switch ON) or the ignition switch
is placed in the OFF position, the L signal from
NOT changes to H signal and NOR outputs
the L signal. Then the timer circuit stops opera-
tion and the buzzer stops sounding.
%sible
link
Constant
voltage
5V
AND
Timer circuit
(Buzzer)
Ignition ON
switch
OFF
J-u-Ln-
2$2
Timer circuit
(Warning light)
L------
Seat
belt
buckle
switch
Timer H
$gnal
(ON)
output
L
sIgnal (OFF)
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f
j
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1
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1
ETACS-ECU
#eat
bell
rarning
aht
4
16X0675
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