Mitsubishi Grandis. Manual — part 222
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-350
YES :
Go to Step 2.
NO :
Repair the tail/stop lamp(s) and
headlamp(s). Refer to trouble symptom
chart
Step 2. ECU check by using the SWS monitor
Check that the power supply and earth lines to the
column switch (column-ECU), the ETACS-ECU and
the front-ECU and the SWS communication lines are
normal.
• Ignition switch: OFF
ECUS TO BE CHECKED
• COLUMN ECU
• ETACS ECU
• FRONT ECU
OK: "OK" are displayed for all the items
Q: Are the check result normal?
"OK" are displayed for all the items :
Go to Step 3.
"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 "ETACS ECU" menu. :
Refer to Inspection Procedure A-3
"Communication with the ETACS-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 3. Function diagnosis by using the SWS
monitor
Check the SWS communication signal, which are
related to the front fog lamps.
<Selected item> LIGHTING - F.FOG LAMP
• Ignition switch: ON
• Lighting switch: "TAIL" or "HEAD"
• Front fog lamp switch: ON
OK: Normal conditions are displayed for all
the items.
Q: Are the check result normal?
Normal conditions are displayed for all the items. :
Go to Step 4.
Normal condition is not displayed for item 00 or 01.
:
Refer to inspection procedure Q-6 "The
column switch (lighting and turn-signal lamp
and headlamp washer switch) signal is not
received
Normal condition is not displayed for item No.30. :
Refer to inspection procedure Q-2 "The
ignition switch (IG1) signal is not received
."
Normal condition is not displayed for item No.36. :
Refer to inspection procedure Q-4 "The
front fog lamp switch signal is not received
."
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 or
HEAD
Item 30
IG SW(IG1)
ON
Item 36
F.FOG LAMP
ON
Item 70
FRONT ECU
ACK
NORMAL ACK or
HI-BEAM ACK
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-351
Step 4. Connector check: A-08X front fog lamp
relay connector
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the defective connector.
Step 5. Check the front fog lamp relay.
Refer to GROUP 54A
.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Replace the front fog lamp relay.
Step 6. Voltage measurement at the A-08X front
fog lamp relay connector.
(1) Remove the front fog lamp relay, and measure at
the relay box side.
(2) Check the voltage between the front fog lamp
relay connector and body earth.
• Voltage between A-08X front fog lamp relay
connector terminal No.1 and body earth
• Voltage between A-08X front fog lamp relay
connector terminal No.2 and body earth
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Go to Step 7.
Step 7. Check the wiring harness between A-08X
front fog lamp relay connector (terminal
Nos.1and 2) and the fusible link (26).
• 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 8. Connector check: A-14X front-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Repair the defective connector.
AC311521AD
Connector: A-08X
1
3
2
4
Front of
vehicle
Relay box side
AC311521AD
Connector: A-08X
1
3
2
4
Front of
vehicle
Relay box side
AC310507 BT
Connector A-08X
(Relay box side)
2
4
1
3
AC311521AD
Connector: A-08X
1
3
2
4
Front of
vehicle
Relay box side
AC311521AB
Connector: A-14X
Relay box side
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-352
Step 9. Check the wiring harness between A-08X
front fog lamp relay connector terminal No.3 and
A-14X front-ECU connector terminal No.1.
• Check the output lines for open circuit.
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Repair the wiring harness.
Step 10. Retest the system.
Check that the front fog 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 ETACS-ECU.
AC311937AB
Connectors: A-08X, A-14X
1
3
2
4
Front of
vehicle
Relay box side
A-08X
A-14X
A-08X
A-14X
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-353
Inspection Procedure O-2: The rear fog lamp do not illuminate normally.
CAUTION
Whenever the ECU is replaced, ensure that the
input and output signal circuits are normal.
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
ETACS-ECU
FUSIBLE
LINK
REAR FOG
LAMP
REAR
FOG
LAMP
RELAY
30
Rear Fog Lamp Circuit <LHD>
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