Mitsubishi Lancer Evolution-IV Workshop Manual page 347

INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure 1
Key hole illumination lamp remains illuminated.
The cause is probably a harness short or a defective ETACS-ECU or buzzer ECU.
Disconnect the ignition key cylinder illumination lamp connector
B-84 and measure the continuity:
D Between 4 and body earth
OK: Conducting
Replace the ETACS-ECU or buzzer ECU.
Inspection Procedure 2
Even if driver's side door is opened, key hole illumination
lamp does not illuminate.
The cause is probably a defective key hole illumination lamp circuit system, or a
defective driver's side door switch input circuit system if the ignition key reminder
warning buzzer is also faulty.
<Vehicles with ETACS-ECU>
MUT-II Pulse check
Driver's side door switch input signal
OK: The MUT-II buzzer sounds once
when the driver's side door switch
is ON.
OK
Disconncet the key hole illumination
lamp connector B-84, and measure at
the harness side.
D Voltage between 3 and body earth
OK: System voltage
OK
Remove ETACS-ECU or buzzer ECU
from junction block, and measure at the
junction block connector B-79
D Ignition key cylinder illumination
lamp connector connected
D Voltage between 12 and body earth
OK: System voltage
OK
Replace ETACS-ECU or buzzer ECU.
CHASSIS ELECTRICAL –
OK
Vehicle with buzzer ECU
NG
Driver's side door switch input circuit
system inspection (Refer to Inspection
Procedure 6 on P.54-10.)
NG
Check the following connectors:
B-49, B-75, B-73
Check trouble symptom.
Check the harness wire between the
ignition key cylinder illumination lamp
and fusible link 1, and repair if neces-
sary.
NG
Check the following connectors:
B-84, B-49, B-75, B-73
Check trouble symptom.
Check the harness wire between
ETACS-ECU or buzzer ECU and fusible
link 1, and repair if necessary.
Ignition Switch
Probable cause
D Malfunction of harness wire
D Malfunction of ETACS-ECU
D Malfunction of buzzer ECU
NG
Check the harness wire between the ignition key cylinder illumination
lamp and junction block, and repair if necessary.
Probable cause
D Malfunction of driver's side door switch
D Malfunction of bulb
D Malfunction of connector
D Malfunction of harness wire
D Malfunction of ETACS-ECU
D Malfunction of buzzer ECU
OK
NG
OK
NG
NG
OK
NG
Repair
Repair
54-7