Mitsubishi Lancer Evolution IX. Manual — part 180
![](/vehicles/winoney/wruvea/ger/tru.png)
INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR
54B-283
INSPECTION PROCEDURE L-14: The rear fog lamp switch signal is not received.
CAUTION
Whenever the ECU is replaced, ensure that the
input signal circuit is normal.
COMMENTS ON TROUBLE SYMPTOM
Input signal from the rear fog lamp switch is used to
operate the rear fog lamps. If the signal is abnormal,
the rear fog lamps will not illuminate and extinguish
normally.
POSSIBLE CAUSES
• Malfunction of the fog lamp switch
• Malfunction of the ETACS-ECU
• Damaged harness wires and connectors
ETACS-
ECU
FOG LAMP
SWITCH
<LHD>
<RHD>
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
Rear Fog Lamp Switch Input Circuit
![](/vehicles/winoney/wruvea/ger/kie.png)
INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR
54B-284
DIAGNOSTIC PROCEDURE
Step 1. Connector check: C-20 fog lamp switch
connector
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the defective connector.
Step 2. Check the rear fog lamp switch.
Refer to GROUP 54A
− Rear fog lamp
.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Replace the fog lamp switch.
Step 3. Resistance measurement at the C-20 fog
lamp switch connector
(1) Remove the fog lamp switch, and measure at the
wiring harness side.
(2) Continuity between C-20 fog lamp switch
connector terminal No.6 and body earth
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 4.
AC310446
Harness side
AH
Connector: C-20
<LHD>
AC310456
Harness side
AI
Connector: C-20
<RHD>
AC310446
Harness side
AH
Connector: C-20
<LHD>
AC310456
Harness side
AI
Connector: C-20
<RHD>
AC301541HA
Connector C-20
(Harness side)
![](/vehicles/winoney/wruvea/ger/lor.png)
INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR
54B-285
Step 4. Check the wiring harness between C-20
fog lamp switch connector terminal No.6 and
body earth.
NOTE:
Prior to the wiring harness inspection, check joint
connector C-101 <LH driver vehicles> or C-06 <RH
drive vehicles>, and repair if necessary.
• Check the earth wires 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. Connector check: C-227 ETACS-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the defective connector.
AC310446
Harness side
AH
Connector: C-20
<LHD>
AC310456
Harness side
AI
Connector: C-20
<RHD>
AC310446
Connector: C-101
<LHD>
AF
Harness side
AC310456
Connector: C-06
<RHD>
AG
Harness side
AC310450
Connector: C-227
AG
Junction block
(rear view)
Harness side
<LHD>
28
37
43
29
44
38
23
32
41
24
25
26
27
34
42
36 35
33
21
22
30
39
40
31
AC310461
Harness side
Junction block (rear view)
Connector: C-227
AF
<RHD>
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
![](/vehicles/winoney/wruvea/ger/eseabb.png)
INPUT SIGNAL PROCEDURES
SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR
54B-286
Step 6. Check the wiring harness between C-227
ETACS-ECU connector terminal No.21 and C-20
fog lamp switch connector terminal No.5.
• Check the input line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair the wiring harness.
Step 7. Retest the system.
Check that the rear fog lamp switch signal is
received 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 ETACS-ECU.
AC310446
Harness side
AH
Connector: C-20
<LHD>
AC310456
Harness side
AI
Connector: C-20
<RHD>
AC310450
Connector: C-227
AG
Junction block
(rear view)
Harness side
<LHD>
28
37
43
29
44
38
23
32
41
24
25
26
27
34
42
36 35
33
21
22
30
39
40
31
AC310461
Harness side
Junction block (rear view)
Connector: C-227
AF
<RHD>
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
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