Mitsubishi Electric 55624R(S)-MF Service Manual page 176

8. TRUNK LID SWITCH INPUT CIRCUIT
Sub fusible link 0
J/B
connector
ETACS
control unit
(electronic
control unit)
9.
SECURITY LIGHT ACTIVATION CIRCUIT
THEFT-ALARM SYSTEM
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
terminal No.
by using an oscilloscope.
Checking the trunk lid switch circuit (Disconnect the connector
of the ECU and Check at the wiring harness side)
ECU
terminal
No.
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)
connector terminal
voltage
(terminal No.8)
Combination mete1
connector terminal
voltage
ETACS
control unit
(electronic
control unit)
ECU terminal voltage
TSB Revision
Condition
Signal
I
Trunk lid
Trunk lid
switch
Connected
Tester
to measured Measurement
connection
component
Trunk lid
Resistance
switch
Check object
meter
positive
voltage
Battery OV
positive
voltage
Battery OV
positive
voltage
Terminal
voltage
Open ov
Closed
Check
Standard
condition
No
Closed
Trunk lid
Open
Cause
Fuse @ damaged or Replace the
disconnected fuse
Harness damaged or Repair the
disconnected, or harness
short-circuit
Damaged or discon- Replace the
bulb
SECURITY light bulb
Harness damaged or Repair the
disconnected harness
Harness damaged or Repair the
disconnected. or
harness
short-circuit
I