Mitsubishi Lancer Evolution IX. Manual — part 230
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-179
Step 4. Voltage measurement at A-10X front-ECU
connector
(1) Remove the front-ECU, and measure at the relay
box side.
(2) Voltage between A-10X front-ECU connector
terminal Nos.3, 4 and body earth
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Go to Step 5.
Step 5. Check the wiring harness between A-10X
front-ECU connector terminal Nos.3, 4 and the
battery.
• Check the power supply line for open circuit.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
Cope with Intermittent Malfunction
NO :
Repair the wiring harness.
Step 6. Retest the system.
Check that the low-beam headlamps illuminate nor-
mally.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
Cope with Intermittent Malfunction
NO :
Replace the front-ECU.
AC310572AB
Connector: A-10X
Relay box side
10
11
5
9 8 7 6
4 3
1
2
Battery
AC301541 DC
Connector A-10X
(Relay box side)
5
11
9
10
8 7 6
2
4 3
1
AC310572AB
Connector: A-10X
Relay box side
10
11
5
9 8 7 6
4 3
1
2
Battery
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-180
INSPECTION PROCEDURE H-4: The high-beam headlamps do not illuminate normally.
CAUTION
Whenever the ECU is replaced, ensure that the
input and output signal circuits are normal.
COMMENTS ON TROUBLE SYMPTOM
If the high-beam headlamps do not illuminate, the
dimmer switch input circuit or the front-ECU may be
defective.
POSSIBLE CAUSES
• Malfunction of the column switch
• Malfunction of the front-ECU
• Damaged harness wires and connectors
Wire colour code
B : Black LG : Light green G : Green L : Blue
W : White Y : Yellow SB : Sky blue BR : Brown
O : Orange GR : Gray R : Red P : Pink V : Violet
BATTERY
FRONT-ECU
TAIL LAMP
RELAY: HI
RELAY
BOX
INPUT SIGNAL
· HEADLAMP AUTOMATIC
SHUTDOWN
· TAIL LAMP SWITCH
· COMBINATION METER
· HEADLAMP (LH)
HEADLAMP (RH)
Headlamp Relay (High-Beam) Circuit
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-181
DIAGNOSIS PROCEDURE
Step 1. ECU check by using the SWS monitor.
Check that the power supply and earth lines to the
column switch (column-ECU) and the front-ECU and
the SWS communication lines are normal.
• Ignition switch: OFF
ECUS TO BE CHECKED
• COLUMN ECU
• FRONT ECU
OK: "OK" is displayed for all the items
Q: Is the check result normal?
"OK" is displayed for all the items :
Go to Step 2.
"NG" is displayed on the "COLUMN ECU" menu. :
Refer to Inspection Procedure A-2
"Communication with the column switch
(column-ECU) is not possible
."
"NG" is displayed on the "FRONT ECU" menu. :
Refer to Inspection Procedure A-4
"Communication with the front-ECU is not
possible
."
Step 2. Function diagnosis by using the SWS
monitor.
Check the SWS communication signal, which are
related to the high-beam headlamps.
<Selected item> LIGHTING - HEADLAMP HI
• Ignition switch: ON
• Lighting switch: HEAD
• Dimmer switch: from OFF to ON, and then to
OFF again
OK: Normal conditions displayed for all the
items
Q: Is the check result normal?
Normal conditions are displayed for all the items. :
Go to Step 3.
Normal condition is not displayed for item 00, 02 or
03. :
Refer to Inspection Procedure L-4 "The
column switch (lighting and turn-signal lamp
switch) signal is not received
Normal condition is not displayed for item No.30. :
Refer to Inspection Procedure L-2 "The
ignition switch (IG1) signal is not received
."
Normal condition is not displayed for item No.35. :
Refer to Inspection Procedure H-6 "The
headlamp automatic shutdown function
does not work normally
."
Normal condition is not displayed for item No.70. :
Replace the front-ECU.
Item No. Item name
Normal condition
Item 00
HEADLAMP
SW
ON
Item 02
DIMMER SW
from OFF to ON, and
then to OFF again ("ON"
should be displayed
when the dimmer switch
is operated)
Item 03
PASSING SW OFF
Item 30
IG SW(IG1)
ON
Item 35
HD
AUTO-CUT
OFF
Item 70
FRONT ECU
ACK
NORMAL ACK
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-182
Step 3. Retest the system.
Check that the high-beam headlamps illuminate nor-
mally.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
Cope with Intermittent Malfunction
NO :
Replace the front-ECU.
INSPECTION PROCEDURE H-5: The high-beam and low-beam headlamps do not illuminate when the
passing switch is operated.
CAUTION
Whenever the ECU is replaced, ensure that the
input and output signal circuits are normal.
COMMENTS ON TROUBLE SYMPTOM
If the low-beam and high-beam headlamps are nor-
mal, the passing switch input signal circuit or the
front-ECU may be defective.
POSSIBLE CAUSES
• Malfunction of the column switch
• Malfunction of the front-ECU
• Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
Step 1. Check the operation of the headlamps.
Check that the low-beam and high-beam headlamps
illuminate normally.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Refer to Inspection Procedure H-3 "The
low-beam headlamps do not illuminate
normally
." And refer to
Inspection Procedure H-4 "The high-beam
headlamps do not illuminate normally
."
Step 2. Check the SWS monitor data list.
Check the ETACS-ECU signals which are related to
the headlamps.
<Selected item> COLUMN ECU
• Passing lamp switch: ON
OK: Normal condition is displayed.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Refer to Inspection Procedure L-4 "The
column switch (lighting and turn-signal lamp
switch) signal is not received
Step 3. Retest the system.
When the passing switch is turned on, check if the
headlamps illuminate normally.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
Cope with Intermittent Malfunction
NO :
Replace the front-ECU.
Item No.
Item name
Normal condition
Item 03
PASSING SW
ON
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