Mitsubishi Lancer Evolution 8. Manual — part 138
SWS – TROUBLESHOOTING
54B-75
Does the interior light switch on normally?
SWS monitor ECU check
• Ignition switch: OFF
ETACS-ECU
OK: “OK” is displayed
SWS monitor service data
(Communications data) ETACS-ECU
• Ignition switch: ON
• Driver’s door: Open
Item No.
Item Name
Normal value
(a) 30
Ignition SW IG1
ON
(b) 32
Driver’s door SW RH
ON
OK: Normal value displayed for all
SWS monitor service data
ETACS switch data
• Ignition switch: OFF (key inserted)
Item No.
Item Name
Normal value
03
Key reminder SW
OFF
OK: Normal value displayed for all
Check connector C-202
Check the ignition key cylinder illumination light bulb
Check connector C-225
Check the harness between the ETACS-ECU and the
ignition key cylinder illumination light
Confirm the trouble symptoms
Transient problem
To Inspection procedure N-1 Interior light does not light
up or switch off correctly (p.54B-76)
To Inspection procedure A-3 No communication with
ETACS-ECU (p.54B-28)
To Inspection procedure R-2 Ignition switch (IG1)
signal not input (p.54B-96)
To Inspection procedure R-4 Driver’s door switch signal
not input (p.54B-98)
To Inspection procedure R-11 Key reminder switch
signal not input (p.54B-103)
Replace the ETACS-ECU
(Vehicle fitted with keyless entry)
Replace
Repair
Repair
YES
NO
NG
NG (a)
NG (b)
OK
OK
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
SWS – TROUBLESHOOTING
54B-76
Inspection procedure K-1
SWS monitor ECU check
• Ignition switch: OFF
(1) ETACS-ECU
(2) Column ECU
(3) Front ECU
OK: “OK” is displayed for all
SWS monitor ECU check
• Ignition switch: OFF
(1) Column ECU
(2) Front ECU
OK: “OK” is displayed for all
SWS monitor service data
(Function by Diagnosis) Lighting: Tail
• Ignition switch: ON
• Tail light switch: ON
Item No.
Item Name
Normal value
(a) 01
Tail light SW
ON
(b) 35
HD light auto cut-off
OFF
(c) 70
Front ECU response
Normal
response
OK: Normal value displayed for all
Confirm the trouble symptoms
Transient problem
To Inspection procedure A-2 No communication with
column switch (column ECU) (p.54B-27)
To Inspection procedure A-4 No communication with
front ECU (p.54B-29)
To Inspection procedure R-5 Tail light switch signal not
input (p.54B-99)
To Inspection procedure K-6 Headlight automatic cut-
off function not working correctly (p.54B-80)
Replace the front ECU
Replace the front ECU
Transient problem
To Inspection procedure A-3 No communication with
ETACS-ECU (p.54B-28)
To Inspection procedure A-2 No communication with
column switch (column ECU) (p.54B-27)
To Inspection procedure A-4 No communication with front
ECU (p.54B-29)
Inspection procedure K-2
Head lights do not light up when passing switch is on. Low beam
lights up (cannot be changed using dimmer switch)
Probable Cause
If the low beam turns on, regardless of the position of the headlight
switch, then the headlight failsafe function has probably engaged.
• Fault in column switch
• Fault in front ECU
• Fault in ETACS-ECU
• Fault in harness or connectors
Tail lights do not light up correctly
Probable Cause
If all of the tail lights do not light up properly, then there is
probably a malfunction in the tail light switch input circuit
system or a fault in the front ECU.
• Fault in column switch
• Fault in front ECU
• Fault in harness or connectors
NG (1)
NG (3)
NG (2)
OK
OK
OK
OK
NG
NG (c)
NG (b)
NG (a)
NG (2)
NG (1)
SWS – TROUBLESHOOTING
54B-77
SWS monitor ECU check
• Ignition switch: OFF
(1) Column ECU
(2) Front ECU
OK: “OK” is displayed for all
SWS monitor service data
(Function by Diagnosis) Lighting: LO
• Ignition switch: ON
• Head light switch: ON
Item No.
Item Name
Normal value
(a) 01
Tail light SW
ON
(b) 35
HD light auto cut-off
OFF
(c) 70
Front ECU response Normal response
OK: Normal value displayed for all
Confirm the trouble symptoms
Transient problem
To Inspection procedure A-2 No communication with
column switch (column ECU) (p.54B-27)
To Inspection procedure A-4 No communication with
front ECU (p.54B-29)
To Inspection procedure R-5 Head light switch signal
not input (p.54B-99)
To Inspection procedure R-2 Ignition switch (IG1)
signal not input (p.54B-96)
Replace the front ECU
Replace the front ECU
Inspection procedure K-3
Head lights (low beam) do not light up
Probable Cause
If neither of the head lights (low beam) lights up properly, then
there is probably a malfunction in the head light switch input
circuit system, or a fault in the front ECU.
If the SWS monitor ECU check returns an “NG” result, then
the headlight backup circuit should also be checked and
repaired at the same time.
(Column switch No.10 – Front ECU No.25)
• Fault in column switch
• Fault in front ECU
• Fault in column ECU
• Fault in harness or connectors
OK
OK
OK
NG (1)
NG (2)
NG (b)
NG (c)
NG
NG (a)
SWS – TROUBLESHOOTING
54B-78
Inspection procedure K-4
SWS monitor ECU check
• Ignition switch: OFF
(1) Column ECU
(2) Front ECU
OK: “OK” is displayed for all
SWS monitor service data
(Function by Diagnosis) Lighting: HI
• Ignition switch: ON
• Head light switch: ON
• Dimmer switch: ON*
Item No.
Item Name
Normal value
(a) 00
Head light SW
ON
(a) 02
Dimmer SW
ON*
(b) 35
HD light auto cut-off
OFF
(c) 70
Front ECU response
High beam
response
OK: Normal value displayed for all
Confirm the trouble symptoms
Transient problem
To Inspection procedure A-2 No communication with
column switch (column ECU) (p.54B-27)
To Inspection procedure A-4 No communication with front
ECU (p.54B-29)
To Inspection procedure R-5 Head light switch signal not
input (p.54B-99)
To Inspection procedure R-5 Dimmer switch signal not
input (p.54B-99)
To Inspection procedure R-2 Ignition switch (IG1) signal
not input (p.54B-96)
Replace the front ECU
Replace the front ECU
Note
*: The display will show “OFF” when the high beam lights are on, but check that it changes to “ON” when the dimmer switch is
operated.
Head lights (high beam) do not light up
Probable Cause
If neither of the head lights (high beam) lights up properly,
then there is probably a problem in the dimmer switch input
circuit system or a fault in the front ECU
• Fault in column switch
• Fault in front ECU
• Fault in column ECU
• Fault in harness or connectors
OK
OK
OK
NG (1)
NG (2)
NG (a)
NG (b)
NG (c)
NG (d)
NG
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