Mitsubishi Lancer Evolution IX. Manual — part 181
INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR
54B-287
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
INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR
54B-288
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
POSSIBLE CAUSES
• Malfunction of the ETACS-ECU
• Damaged wiring harness or connector(s)
DIAGNOSTIC PROCEDURE
Step 1. Check the power supply circuit.
When the ignition switch is turned to the LOCK
(OFF) position, check if the hazard warning lamps
illuminate.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Refer to inspection procedure A-2 "Check
the battery power supply circuit to the
ETACS-ECU
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.
(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.
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
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
INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR
54B-289
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.
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.
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>
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
INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR
54B-290
Step 6. Check the wiring harness between C-226
ETACS-ECU connector terminal No.4 and the
ignition switch (ACC).
NOTE:
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
AC310456
Connector: C-23
AJ
<RHD>
C-23 (B)
Harness side
AC310448
Junction block (front view)
Connector: C-210
AK
<LHD>
Harness side
10
1
6
14
5
12
13
4
11
7
2
3
8
9
AC310458
Junction block (front view)
Connector: C-210
AH
<RHD>
Harness side
10
1
6
14
5
12
13
4
11
7
2
3
8
9
AC310446
Connector: C-129
<LHD>
AI
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