Mitsubishi Lancer Evolution IX. Manual — part 262
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INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-307
INSPECTION PROCEDURE L-15: Interior lamp loaded signal is not detected.
CAUTION
Whenever the ECU is replaced, ensure that the
input signal circuit is normal.
IGNITION
SWITCH (IG1)
IGNITION
SWITCH (ACC)
COMBINATION
METER
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
KEEP RELAY
ETACS-ECU
INTERIOR LAMP CUT
BACK-UP CIRCUIT
POWER
SOURCE
LOAD
DETERMINATION
CIRCUIT
BATTERY
J/B SIDE
<LHD>
<RHD>
· LUGGAGE COMPARTMENT LAMP
· FRONT ROOM LAMP
· REAR ROOM LAMP
RELAY
BOX
Interior Lamp Automatic Shutdown Function Circuit
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INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-308
COMMENTS ON TROUBLE SYMPTOM
The interior lamp automatic shutdown function oper-
ates in accordance with the interior lamp loaded sig-
nal. If this signal is abnormal, the functions below will
not work normally.
• Ignition key cylinder illumination lamp
• Room lamps
• Interior lamp automatic shutdown function
POSSIBLE CAUSES
• Malfunction of the ETACS-ECU
• Damaged wiring harness or connector(s)
DIAGNOSIS PROCEDURE
Step 1. ECU check by using the SWS monitor.
Check that the power supply and earth lines to the
ETACS-ECU and the SWS communication lines are
normal.
• Ignition switch: OFF
ECUS TO BE CHECKED
• ETACS ECU
OK: "OK" is displayed on the "ETACS ECU"
menu.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Refer to Inspection Procedure A-3
"Communication with the ETACS-ECU is
not possible
Step 2. Connector check: C-226 ETACS-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the defective connector.
Step 3. Voltage measurement at the C-226
ETACS-ECU connector
(1) Remove the ETACS-ECU, and measure at the
junction block side.
AC310450
Connector: C-226
AB
Junction block side
Junction block (rear view)
<LHD>
AC310461
Junction block (rear view)
Connector: C-226
AB
<RHD>
Junction block side
AC310450
Connector: C-226
AB
Junction block side
Junction block (rear view)
<LHD>
AC310461
Junction block (rear view)
Connector: C-226
AB
<RHD>
Junction block side
![](/vehicles/winoney/wruvea/ger/rake.png)
INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-309
(2) Turn the ignition switch to the ON position.
(3) Voltage between C-226 ETACS-ECU connector
terminal No.8 and body earth
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 4.
Step 4. Check the wiring harness between C-226
ETACS-ECU connector terminal No.8 and the
ignition switch (IG1).
NOTE:
Prior to the wiring harness inspection, check junction
block connector C-211, and repair if necessary.
• Check the power supply line to the ignition switch
(IG1) 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.
AC301541GU
Connector C-226
(Junction block side)
2019
7
13
17
18
1615 14
10
11
12
9 8
2
6 5
3
4
1
AC310450
Connector: C-226
AB
Junction block side
Junction block (rear view)
<LHD>
AC310461
Junction block (rear view)
Connector: C-226
AB
<RHD>
Junction block side
AC310448
Harness side
Junction block (front view)
Connector: C-211
AB
<LHD>
4
6 5
3
2
1
AC310458
Harness side
Junction block (front view)
Connector: C-211
AB
<RHD>
![](/vehicles/winoney/wruvea/ger/syorhenig.png)
INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-310
Step 5. Voltage measurement at the C-226
ETACS-ECU connector
(1) Remove the ETACS-ECU, and measure at the
junction block side.
(2) Turn the ignition switch to the ACC position.
(3) Voltage between C-226 ETACS-ECU connector
terminal No.4 and body earth
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 6.
Step 6. Check the wiring harness between C-226
ETACS-ECU connector terminal No.4 and the
ignition switch (ACC).
AC310450
Connector: C-226
AB
Junction block side
Junction block (rear view)
<LHD>
AC310461
Junction block (rear view)
Connector: C-226
AB
<RHD>
Junction block side
AC301541HB
Connector C-226
(Junction block side)
2019
7
13
17
18
1615 14
10
11
12
9 8
2
6 5
3
4
1
AC310450
Connector: C-226
AB
Junction block side
Junction block (rear view)
<LHD>
AC310461
Junction block (rear view)
Connector: C-226
AB
<RHD>
Junction block side
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