Mitsubishi Lancer Evolution 8. Manual — part 139
SWS – TROUBLESHOOTING
54B-79
Do the head lights (low beam and high beam) light up
correctly?
Confirm the trouble symptoms
Transient problem
To Inspection procedure K-3 Head lights (low beam) do
not light up (p.54B-77) and Inspection procedure K-4
Head lights (high beam) do not light up (p.54B-78)
To Inspection procedure R-5 Passing switch signal not
input (p.54B-99)
Replace the front ECU
SWS monitor service data
(Communications data) Column ECU
• Passing switch: ON
Item No.
Item Name
Normal value
03
Passing SW
ON
OK: Normal value displayed for all
Inspection procedure K-5
Head lights (low beam and high beam) do not light up
when passing switch is ON
Probable Cause
If neither of the head lights (low beam and high beam) lights
up properly, then there is probably a problem in the passing
switch input circuit system or a fault in the front ECU
• Fault in column switch
• Fault in column ECU
• Fault in front ECU
• Fault in harness or connectors
YES
OK
OK
NO
NG
NG
SWS – TROUBLESHOOTING
54B-80
Inspection procedure K-6
Do the tail lights and head lights light up normally?
Is the head light automatic cut-off function set to
“Function switched off” by the adjustment function?
SWS monitor service data
(Function by Diagnosis) Lighting: Automatic cut-off
(1) Ignition switch: ON
(2) Ignition switch: ON
→
OFF
Item No.
Item Name
Normal value
(a) 30
Ignition SW IG1
OFF
(3)
Driver’s door: Open
Item No.
Item Name
Normal value
(b) 32
Front door SW RH
ON
(c) 35
HD light auto cut-off
ON
OK: Normal value displayed for all
Confirm the trouble symptoms
Transient problem
Check the head lights and tail lights (see Chart of
Trouble Symptoms)
Use the adjustment function to set the headlight
automatic cut-off function to “Function ON” (p.54B-118)
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)
Replace the ETACS-ECU
Replace the front ECU
Head light automatic cut-off function not working correctly
Probable Cause
This function is operated by determining input signals from the
ignition switch (IG1) and the driver’s door switch in the ETACS-
ECU. If it does not work properly, then there is probably a
malfunction in the input circuit system, a fault in the front ECU or a
fault in the ETACS-ECU.
It is also a possibility that the function has been switched off by the
adjustment function.
• Fault in driver’s door switch
• Fault in front ECU
• Fault in ETACS-ECU
• Fault in harness or connectors
YES
YES
OK
OK
NO
NO
NG (a)
NG (b)
NG (c)
NG
SWS – TROUBLESHOOTING
54B-81
Check connector
(RH head light (LO)) A-41
(RH head light (HI)) A-23
(LH head light (LO)) A-33
(LH head light (HI)) A-16
(High beam indicator light) C-106
Check the head light bulb that is not working, or the high
beam indicator bulb
(Head light (LO))
Measure at the Head light (LO) connector A-41 (RH), A-
33 (LH)
• Detach the connector and check on the harness side
(Car not fitted with discharge head lights)
• Connectivity between 3 & body earth
(Car fitted with discharge head lights)
• Connectivity between 8 & body earth
OK: Connectivity
(Head light (HI))
Measure at the Head light (HI) connector A-23 (RH), A-
16 (LH)
• Detach the connector and check on the harness side
• Connectivity between 2 & body earth
OK: Connectivity
(High beam indicator light)
Measure at the Combination meter connector C-106
• Detach the connector and check on the harness side
• Connectivity between 5 & body earth
OK: Connectivity
Check connector
(High beam indicator light) C-31
Check the harness between the head light that is not
working or the combination meter, and the special fuse,
and repair
Check the harness between the head light that is not
working or the combination meter, and the body earth,
and repair
Inspection procedure K-7
One of the head lights does not light up (including high
beam indicator light)
Probable Cause
If any one of the head lights does not light up correctly, then
there is probably a fault in the harness connectors, or a fault
in the bulb, or the fuse has blown.
• Fault in headlight bulb
• Fault in high beam indicator bulb
• Fault in harness or connectors
Replace
Repair
OK
OK
OK
OK
NG
NG
NG
NG
Repair
SWS – TROUBLESHOOTING
54B-82
Inspection procedure K-8
Check connectors
(Tail light RH) F-10
(Tail light LH) F-15
(Position light RH) A-41
(Position light LH) A-33
(Licence plate light RH) F-12
(Licence plate light LH) F-13
Check connectors
(Tail light RH) C-215, C-209, C-07, C-31
(Tail light LH) C-29, C-31
(Licence plate light) F-14, C-29, C-31
Check the harness between the rear combination light,
front combination light or licence plate light that is not
working, and the special fuse, and repair
(Licence plate light)
Check connector F-14
Check the harness between the rear combination light,
front combination light or licence plate light that is not
working, and the body earth, and repair.
Check the head light bulb that is not working
(Tail light)
Measure at the Rear combination light connector F-10
(RH) and F-15 (LH)
• Detach the connector and check on the harness side
• Connectivity between 5 & body earth
OK: Connectivity
(Position light)
Measure at the Front combination light connector A-
41(RH) A-33(LH)
• Detach the connector and check on the harness side
(Car not fitted with discharge headlights)
• Connectivity between 3 & body earth
(Car fitted with discharge headlights)
• Connectivity between 7 & body earth
OK: Connectivity
(License plate light)
Measure at the at the Licence plate light connector
F-12(RH), F-13(LH)
• Detach the connector and check on the harness side
• Connectivity between 1 & body earth
OK: Connectivity
One of the tail lights, position lights, or licence plate
lights does not light up
Probable Cause
If any one of the tail lights, position lights or licence plate
lights does not light up correctly, then there is probably a fault
in the harness connectors, or a fault in the bulb, or the fuse
has blown.
• Fault in tail light bulb
• Fault in position light
• Fault in licence plate light bulb
• Fault in harness or connectors
OK
NG
NG
NG
OK
OK
OK
NG
OK
NG
Repair
Repair
Replace
Repair
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