Mitsubishi Grandis. Manual — part 203
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-274
"OK" are 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 are displayed for all
the items
Q: Are 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 Q-6 "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 Q-2 "The
ignition switch (IG1) signal is not received
Normal condition is not displayed for item No.35. :
Refer to Inspection Procedure M-5 "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-14X 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-14X front-ECU
connector.
(1) Remove the front-ECU, and measure at the relay
box side.
(2) Voltage between A-14X 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.
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
AC311521AB
Connector: A-14X
Relay box side
AC311521AB
Connector: A-14X
Relay box side
AC310507CE
Connector A-14X
(Relay box side)
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-275
Step 5. Check the wiring harness between A-14X
front-ECU connector terminal No.5 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 6. Retest the system.
Check that the tail/stop 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.
Inspection Procedure M-2: 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
AC311521AB
Connector: A-14X
Relay box side
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
FRONT-ECU
HEADLAMP
RELAY: LO
RELAY
BOX
INPUT SIGNAL
· HEADLAMP AUTOMATIC
SHUTDOWN
· HEADLAMP SWITCH
HEADLAMP (LO: LH)
HEADLAMP (LO: RH)
Headlamp Relay (Low-Beam) Circuit
FUSIBLE LINK
26
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-276
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" are displayed for all the items
Q: Are the check result normal?
"OK" are 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 are displayed for all
the items
Q: Are the check result normal?
Normal conditions are displayed for all the items. :
Go to Step 3.
Normal condition is not displayed for item No.00 or
03. :
Refer to inspection procedure Q-6 "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 Q-2 "The
ignition switch (IG1) signal is not received
."
Normal condition is not displayed for item No.35. :
Refer to Inspection Procedure M-5 "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-14X 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-14X front-ECU
connector.
(1) Remove the front-ECU, and measure at the relay
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
AC311521AB
Connector: A-14X
Relay box side
AC311521AB
Connector: A-14X
Relay box side
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-277
box side.
(2) Voltage between A-14X front-ECU connector
terminal Nos.3, 4 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-14X
front-ECU connector terminal Nos.3, 4 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 6. Retest the system.
Check that the low-beam headlamps 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.
AC310507CD
Connector A-14X
(Relay box side)
AC311521AB
Connector: A-14X
Relay box side
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