THEFT-ALARM SYSTEM
Troubleshooting
8. TRUNK LID SWITCH INPUT CIRCUIT
9.
Sub fusible link
J/B
3
or storage
connector
ETACS
control unit
(electronic
control unit)
Off Draw
Description of operation
When the trunk lid is closed (the trunk lid switch is switched
OFF), HIGH-level signals are sent to the ECU.
When the trunk lid is opened (the trunk lid switch is switched
ON), LOW-level signals are sent to the ECU.
ECU terminal voltage (Connection condition of the ECU
ECU
Signal
I
Condition
Terminal
terminal No.
voltage
I
Trunk lid
Open
ov
switch
Trunk lid
Closed
Measurement is not possible by using a voltmeter, but is possible
by using an oscilloscope.
Checking the trunk lid switch circuit (Disconnect the connector
of the ECU and Check at the wiring harness side)
ECU
Connected
terminal
to measured
Measurement
Tester
Check
connection
condition
Standard
No.
component
No
Trunk lid
Closed
switch
Resistance
Trunk lid
Open
SECURITY LIGHT ACTIVATION CIRCUIT
switch
Description of operation
If all doors are in locked state after key locking or key-less
locking, the ECU transistor is turned ON and the security light
comes on.
Checking the security light activation circuit (Disconnect the
connector of the ECU and check at the wiring harness side)
ETACS
control unit
(electronic
control unit)
Check object
Cause
meter
connector terminal
voltage
(terminal
Combination
connector terminal
voltage
No.
positive
voltage
Fuse damaged or
disconnected
Harness damaged or
disconnected, or
short-circuit
Replace the
fuse
Repair the
harness
Battery OV
positive
voltage
Damaged or
wiring of
SECURITY light bulb
Harness damaged or
disconnected
Replace the
bulb
Repair the
harness
ECU terminal voltage
Battery OV
Harness damaged or
Repair the
positive
disconnected. or
harness
voltage
short-circuit
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