Mitsubishi Lancer Evolution IX. Manual — part 229
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-175
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 tail lamps.
<Selected item> LIGHTING - TAIL LAMP
• Ignition switch: ON
• Lighting switch: TAIL
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, 01 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 when the
lighting switch is at
HEAD
Item 01
TAIL LAMP SW
ON when the
lighting switch is at
TAIL
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-176
Step 3. Connector check: A-10X front-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the defective connector.
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 No.5 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 No.5 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 tail lamps 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.
AC310572AB
Connector: A-10X
Relay box side
10
11
5
9 8 7 6
4 3
1
2
Battery
AC310572AB
Connector: A-10X
Relay box side
10
11
5
9 8 7 6
4 3
1
2
Battery
AC301541 DB
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-177
INSPECTION PROCEDURE H-3: The low-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 low-beam headlamps do not illuminate, the
headlamp 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
HEADLAMP
RELAY: LO
RELAY
BOX
INPUT SIGNAL
· HEADLAMP AUTOMATIC
SHUTDOWN
· TAIL LAMP SWITCH
HEADLAMP
ASSEMBLY (LH)
HEADLAMP
ASSEMBLY (RH)
Headlamp Relay (Low-Beam) Circuit
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-178
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 low-beam headlamps.
<Selected item> LIGHTING - HEADLAMP LO
• Ignition switch: ON
• Lighting switch: HEAD
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 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.
Step 3. Connector check: A-10X front-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the defective connector.
Item No. Item name
Normal condition
Item 00
HEADLAMP SW
ON
Item 03
PASSING SW
OFF
Item 30
IG SW(IG1)
ON
Item 35
HD AUTO-CUT
OFF
Item 70
FRONT ECU ACK NORMAL ACK
AC310572AB
Connector: A-10X
Relay box side
10
11
5
9 8 7 6
4 3
1
2
Battery
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