Mitsubishi Lancer Evolution-IV Workshop Manual page 349

Inspection Procedure 4
The key reminder warning buzzer dose not stop sounding
even if the key is removed. (However, it stops when the
driver's side door is closed.)
The cause is probably a malfunction of the key reminder switch input circuit system,
or a malfunction of ETACS-ECU, or a malfunction of buzzer ECU.
<Vehicles with ETACS-ECU>
MUT-II Pulse check
Ignition switch input inspection
OK: The MUT-II buzzer sounds once
when the ignition key is removed
from the key cylinder.
NG
Key reminder switch continuity inspec-
tion (Refer to P. 54-12.)
OK
Disconnect the key reminder switch
connector and connect the terminal No.
5 to the body earth. Does the buzzer
stop sounding?
YES
Check the following connectors.
B-84, B-75
OK
Check the harness wire between the
key reminder switch and the body earth
and repair if necessary.
OK
Replace the ETACS-ECU or the buzzer
ECU.
CHASSIS ELECTRICAL –
OK
Replace the ETACS-ECU.
<Vehicles with buzzer ECU>
NG
Replace
NO
Check the following connectors.
B-84, B-75, B-79
Check trouble symptom
NG
Replace
Inspect the harness between the key
reminder switch and ETACS-ECU or
buzzer ECU, and repair if necessary.
Check trouble symptom.
Replace the buzzer ECU.
Ignition Switch
Probable cause
D Malfunction of key reminder switch
D Malfunction of connector
D Malfunction of harness
D Malfunction of ETACS-ECU
D Malfunction of buzzer ECU
NG
OK
NG
OK
NOTE
The stop indicated with a dotted line
applies only to vehicles with buzzer
ECU.
Repair
54-9