MITSUBISHI 380 2005 Workshop Manual

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-341
STEP 2. Check the input signal by using "FUNCTION
DIAG." menu of the SWS monitor.
Set each switch to the following condition before checking input
signal from the fog lamp switch:
Ignition switch: ON
Fog lamp switch: ON
NOTE: Turn the ignition switch to the "ON" position in order to
disable the headlamp automatic shutdown function.
To prevent damage to Diagnostic Tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting Diagnostic Tool
MB991958. Connect special tool MB991910 before con-
necting special tool MB991812. Be sure to connect special
tool MB991806 after turning on special tool MB991824.
(1) Connect the special tool. Refer to "How to connect SWS
monitor P.54B-13."
(2) Operate Diagnostic Tool MB991958 according to the
procedure below to display "F.FOG."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f. Select "LIGHTING."
g. Select "F.FOG."
(3) Check that normal conditions are displayed for the items
described in the table below.
Q: Does the Diagnostic Tool MB991958 display the items
"IG SW (IG1)" and "F.FOG LAMP" as normal condition?
Normal conditions are displayed for all the items : Go to
St e p 3 .
Normal condition is not displayed for "IG SW (IG1)" :
Refer to Inspection Procedure M-2 "ETACS-ECU
does not receive any signal from the ignition switch
(IG1) P.54B-408."
Normal condition is not displayed for "F.FOG LAMP" :
Refer to Inspection Procedure M-3 "ETACS-ECU
does not receive any signal from the fog lamp switch
P.54B-410." ITEM NO. ITEM NAME NORMAL CONDITION
ITEM 30 IG SW (IG1) ON
ITEM 36 F.FOG LAMP ON

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-342
STEP 3. Check fog lamp relay connector A-05X for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is fog lamp relay connector A-05X in good condition?
YES : Go to Step 4.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. Verify that the fog lamps illuminate normally.
STEP 4. Check the fog lamp relay.
Q: Is the fog lamp relay in good condition?
YES : Go to Step 5.
NO : Replace the fog lamp relay. Verify that the fog lamps
illuminate normally.
BATTERY VOLTAGE TESTER
CONNECTIONSPECIFIED
CONDITION
Not applied 1
4 Open circuit
Connect terminal 2
to the positive
battery terminal
Connect terminal 3
to the negative
battery terminal1
4 Less than 2 ohms

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-343
STEP 5. Check the battery power supply circuit to the fog
lamp relay. Measure the voltage at fog lamp relay
connector A-05X.
The top and bottom of the fog lamp relay are difficult to
identify. Prior to inspection, confirm the triangle mark on
the relay box.
(1) Disconnect fog lamp relay connector A-05X and measure
the voltage available at the relay box side of the connector.
(2) Measure the voltage between terminal 1 and ground, and
also between terminal 2 and ground.
The voltage should measure approximately 12 volts
(battery positive voltage).
Q: Is the measured voltage approximately 12 volts (battery
positive voltage)?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Check the wiring harness between fog lamp relay
connector A-05X (terminals 1 and 2) and the battery.
Q: Is the wiring harness between fog lamp relay connector
A-05X (terminals 1 and 2) and the battery in good
condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify that
the fog lamps illuminate normally.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-344
STEP 7. Check front-ECU connector A-11X for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is front-ECU connector A-11X in good condition?
YES : Go to Step 8.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. Verify that the fog lamps illuminate normally.
STEP 8. Check the wiring harness between fog lamp relay
connector A-05X (terminal 3) and front-ECU connector
A-11X (terminal 11).
Q: Is the wiring harness between fog lamp relay connector
A-05X (terminal 3) and front-ECU connector A-11X
(terminal 11) in good condition?
YES : Go to Step 9.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify that
the fog lamps illuminate normally.
STEP 9. Replace the ECU.
(1) Replace the front-ECU.
(2) The fog lamps should illuminate normally.
Q: Do the fog lamps illuminate normally?
YES : No action is necessary and testing is complete.
NO : Replace the ETACS-ECU. Verify that the fog lamps
illuminate normally.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-345
INSPECTION PROCEDURE J-2: Fog Light: Fog lamps do not go out when the headlamps (low-beam)
are turned off while the fog lamps are on.
.
TECHNICAL DESCRIPTION (COMMENT)
If the trouble above occurs, the front-ECU may be
defective.
.
TROUBLESHOOTING HINT
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
The front-ECU may be defective
DIAGNOSIS
Replace the front-ECU.
The fog lamps should go out when the headlamps (low-beam)
are turned off while the fog lamps are on.
INSPECTION PROCEDURE J-3: Fog Light: One of the fog lamps does not illuminate.
.
TECHNICAL DESCRIPTION (COMMENT)
If one of the fog lamps does not illuminate, the fog
lamp relay or the fog lamp bulb may be defective. If
the fog lamp indicator lamp does not illuminate, the
combination meter may be defective.
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
The fog lamp bulb may be defective
.
DIAGNOSIS
Required Special Tool:
MB991223: Harness Set

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-346
STEP 1. Verify that the fog lamps and the fog lamp
indicator lamp illuminate.
Q: Do the fog lamps and the fog lamp indicator lamp
illuminate normally?
Only the fog lamp (LH) does not illuminate : Go to Step
2.
Only the fog lamp (RH) does not illuminate : Go to Step
8.
Only the fog lamp indicator does not illuminate : Refer
to Inspection Procedure J-4 "The fog lamp indicator
does not illuminate normally P.54B-350."
Both of the fog lamps do not illuminate : Refer to
Inspection Procedure J-1 "Fog lamps do not
illuminate when the fog lamp switch is turned on
P.54B-340."
STEP 2. Check fog lamp (LH) connector A-22 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is fog lamp (LH) connector A-22 in good condition?
YES : Go to Step 3.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. Check that the fog lamps illuminate
normally.
STEP 3. Check the fog lamp bulb (LH).
(1) Remove the fog lamp bulb (LH).
(2) Verify that the fog lamp bulb (LH) is not damaged or burned
out.
Q: Is the fog lamp bulb (LH) in good condition?
YES : Go to Step 4.
NO : Replace the fog lamp bulb (LH). Verify that the fog
lamps illuminate normally.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-347
STEP 4. Check the ground circuit to the fog lamp (LH).
Measure the resistance at fog lamp (LH) connector A-22.
(1) Disconnect fog lamp (LH) connector A-22 and measure the
resistance available at the wiring harness side of the
connector.
(2) Measure the resistance value between terminal 2 and
ground.
The resistance should be 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
YES : Go to Step 6.
NO : Go to Step 5.
STEP 5. Check the wiring harness between fog lamp (LH)
connector A-22 (terminal 2) and ground.
Q: Is the wiring harness between fog lamp (LH) connector
A-22 (terminal 2) and ground in good condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify that
the fog lamps illuminate normally.
STEP 6. Check fog lamp relay connector A-05X for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is fog lamp relay connector A-05X in good condition?
YES : Go to Step 7.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. Check that the fog lamps illuminate
normally.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-348
STEP 7. Check the wiring harness between fog lamp relay
connector A-05X (terminal 4) and fog lamp (LH) connector
A-22 (terminal 1).
Q: Is the wiring harness between fog lamp relay connector
A-05X (terminal 4) and fog lamp (LH) connector A-22
(terminal 1) in good condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify that
the fog lamps illuminate normally.
STEP 8. Check fog lamp (RH) connector A-28 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is fog lamp (RH) connector A-28 in good condition?
YES : Go to Step 9.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. Check that the fog lamps illuminate
normally.
STEP 9. Check the fog lamp bulb (RH).
(1) Remove the fog lamp bulb (RH).
(2) Verify that the fog lamp bulb (RH) is not damaged or burned
out.
Q: Is the fog lamp bulb (RH) in good condition?
YES : Go to Step 10.
NO : Replace the fog lamp bulb (RH). Verify that the fog
lamps illuminate normally.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-349
STEP 10. Check the ground circuit to the fog lamp (RH).
Measure the resistance at fog lamp (RH) connector A-28.
(1) Disconnect fog lamp (RH) connector A-28 and measure the
resistance available at the wiring harness side of the
connector.
(2) Measure the resistance value between terminal 2 and
ground.
The resistance should be 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
YES : Go to Step 12.
NO : Go to Step 11.
STEP 11. Check the wiring harness between fog lamp (RH)
connector A-28 (terminal 2) and ground.
Q: Is the wiring harness between fog lamp (RH) connector
A-28 (terminal 2) and ground in good condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify that
the fog lamps illuminate normally.
STEP 12. Check fog lamp relay connector A-05X for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is fog lamp relay connector A-05X in good condition?
YES : Go to Step 13.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. Check that the fog lamps illuminate
normally.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-350
STEP 13. Check the wiring harness between fog lamp relay
connector A-05X (terminal 4) and fog lamp (RH) connector
A-28 (terminal 1).
Q: Is the wiring harness between fog lamp relay connector
A-05X (terminal 4) and fog lamp (RH) connector A-28
(terminal 1) in good condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify that
the fog lamps illuminate normally.
INSPECTION PROCEDURE J-4: The fog lamp indicator does not illuminate normally.
NOTE: This troubleshooting procedure requires the
use of Diagnostic Tool MB991958 and SWS monitor
kit MB991813. For details on how to use the SWS
monitor, refer to "How to connect SWS monitor
P.54B-13."
.