Mitsubishi Lancer Evolution 7. Manual — part 395
SWS -
Troubleshooting
54B-25
Inspection Procedure I-1
The room lamps do not come ON or OFF normally.
Probable cause
The ETACS-ECU controls the room lamp ON/OFF operation based on input
signals from the following.
D
Ignition switch (ACC)
D
Ignition switch (IG1)
D
Driver’s door switch
D
Door switch fault
D
Driver’s door lock actuator fault
D
ETACS-ECU fault
D
Harness or connector fault
D
Driver s door switch
D
All door switches
D
Driver’s door lock actuator
If the room lamp ON/OFF operation is defective, either one of the above input circuit
systems or the ETACS-ECU may be defective.
NG
Check the defective input circuit. (Refer to P.54B-8, Defects
Found by Input Signal Check).
OK
OK
NG
Check the trouble symptoms.
NG
Repair
Check the following connectors: C-226, C-218, D-03, D-05
NG
Repair
When the ignition switch is in the LOCK (OFF) position, do
the hazard lamps work?
NO
Check ETACS-ECU battery power circuit system (Refer to
P.54B-33, Inspection Procedure K-1).
YES
Check the front and rear room lamp bulbs.
OK
Check the MUT-II input signals.
D
Ignition switch (ACC)
D
Ignition switch (IG1)
D
Driver’s door switch
D
All door switches
NG
Replace ETACS-ECU.
OK
Check the trouble symptoms.
Check the harness between ETACS-ECU and the front and
rear room lamps.
SWS -
Troubleshooting
54B-26
Inspection Procedure J-1
No ignition switch (ACC) signal input to ETACS-ECU.
Probable cause
As the ignition switch (ACC) input signal is used to control the operation of the
following functions, any abnormality in this signal prevents these functions
operating normally.
D
Windshield wiper and washer
D
ETACS-ECU fault
D
Harness or connector fault
NG
Repair
NG
Check the harness between the ETACS-ECU and the ignition
switch (ACC), and repair if necessary.
OK
Replace ETACS-ECU.
OK
Check the trouble
symptoms.
Measure at ETACS-ECU connector C-226.
D
Disconnect the connector and test on the junction box
side.
D
Ignition switch: ACC
D
Voltage between terminal 18 and body earth.
OK : System voltage
NG
Check the following connectors: C-226, C-210
Inspection Procedure J-2
No ignition switch (IG1) signal input to ETACS-ECU.
Probable cause
As the ignition switch (IG1) input signal is used to control the operation of the
following functions, any abnormality in this signal prevents these functions
operating normally.
D
Lights left ON reminder warning function
D
Power window timer function
D
Headlamp automatic cut-off function
D
Turn signal lamps
D
Room lamps
D
ETACS-ECU fault
D
Harness or connector fault
NG
Repair
NG
Check the harness between ETACS-ECU and the ignition
switch (IG1), and repair if necessary.
OK
Replace ETACS-ECU.
OK
Check the trouble
symptoms.
Measure at ETACS-ECU connector C-226.
D
Disconnect the connector and test on the junction box
side.
D
Ignition switch: ON
D
Voltage between terminal 8 and body earth.
OK : System voltage
NG
Check the following connectors: C-226, C-210
SWS -
Troubleshooting
54B-27
Inspection Procedure J-3
No hazard warning lamp switch signal input to
ETACS-ECU.
Probable cause
As the hazard warning lamp switch input signal is used to control the operation
of the following functions, any abnormality in this signal prevents these functions
operating normally.
D
Hazard warning lamps
D
Hazard warning lamp switch fault
D
ETACS-ECU fault
D
Harness or connector fault
NG
Repair
NG
Check the harness between the hazard warning lamp switch
and earth.
NG
Repair
OK
Replace ETACS-ECU.
NG
Check the harness between the hazard warning lamp switch
and the ETACS-ECU, and repair if necessary.
NG
Repair
OK
Check the trouble
symptoms.
OK
Check the following connectors: C-03, C-228
OK
Check the trouble
symptoms.
OK
Measure at the hazard warning lamp switch connector C-03.
D
Disconnect the connector and test on the harness side.
D
Continuity between terminal 2 and body earth
OK : Continuity confirmed.
NG
Check the following connectors: C-03, C-08
Check the hazard warning lamp switch (Refer to GROUP 54A).
NG
Replace
SWS -
Troubleshooting
54B-28
Inspection Procedure J-4
No fog lamp switch signal input to ETACS-ECU.
Probable cause
When the rear fog lamp switch input signal fault occurs, the rear fog lamp
switch signal is not transmitted to the SWS communication line.
D
Rear fog lamp switch inoperative
D
ETACS-ECU fault
D
Harness or connector fault
NG
Repair
OK
Check and repair the harness from the rear fog lamp switch
to the body earth.
NG
Replace ETACS-ECU.
OK
OK
Check the harness from the rear fog lamp switch to
ETACS-ECU.
NG
Repair
OK
Check the following connectors: C-137, C-227
NG
Repair
OK
Measure at the rear fog lamp switch connector C-137.
D
Disconnect the connector and test on the harness side.
D
Continuity between terminal 6 and body earth
OK : Continuity confirmed.
NG
Check the following connectors:
C-137, C-102 <L.H. drive vehicle>
C-137, C-08 <R.H. drive vehicle>
Check the rear fog lamp switch (Refer to GROUP 54A - Rear
Fog Lamp).
NG
Replace
Check the trouble symptoms.
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