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CHASSIS ELECTRICAL - Theft-alarm Svstem
,
2
51
L
r
C-66
1
ECU
CHECKING THE CIRCUIT AND INDIVIDUAL PART
1. ETACS POWER-SUPPLY AND GROUND CIRCUITS
Description of operation
The battery supplies a stabilized 5 V power supply to the
ECU, via the constant-voltage circuit and terminal 51 (which
is directly connected to the battery).
ECU terminal voltage (Connection condition of the ECU con-
nector).
ECU
Signal
terminal No.
51
ECU power supply
2. KEY-REMINDER SWITCH INPUT CIRCUIT
Description of operation
The key-reminder switch is switched OFF and HIGH-level
signals are sent to the ECU when the key is inserted into
the ignition key cylinder: when the key is removed, the key-re-
minder switch is switched ON and LOW-level signals are sent
to the ECU.
ECU terminal voltage (Connection condition of the ECU con-
nector).
ECU
Signal
terminal No.
64
Key-reminder
switch
Terminal
Condition
voltage
At all times
12v
Terminal
Condition
voltage
Key removed
12 V
Key inserted
0 V
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