Mitsubishi Galant 9G. Manual — part 101
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
54B-400
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 light switch:
• Ignition switch: ON
• Fog light switch: ON
NOTE: Turn the ignition switch to the "ON" position in order to
disable the headlight automatic shutdown function.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958. Connect
special tool MB991910 before connecting 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
."
(2) Operate scan 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 scan tool MB991958 display the items "IG SW
(IG1)" and "F.FOG LIGHT" as normal condition?
Normal conditions are displayed for all the items : Go to
Step 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)
Normal condition is not displayed for "F.FOG LIGHT" :
Refer to Inspection Procedure M-3 "ETACS-ECU
does not receive any signal from the fog light switch
ITEM NO.
ITEM NAME
NORMAL CONDITION
ITEM 30
IG SW (IG1)
ON
ITEM 36
F.FOG LIGHT
ON
AC305411AB
MB991910
DATA LINK
CONNECTOR
MB991827
MB991824
MB991806
MB991812
AC302210
COLUMN SWITCH
CONNECTOR
COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE
MB991812
AB
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
54B-401
STEP 3. Check fog light relay connector A-05X for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is fog light 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
. Verify that the fog lights illuminate normally.
STEP 4. Check the fog light relay.
Q: Is the fog light relay in good condition?
YES : Go to Step 5.
NO : Replace the fog light relay. Verify that the fog lights
illuminate normally.
AC305979 AB
CONNECTOR: A-05X
RELAY BOX SIDE
FRONT OF VEHICLE
BATTERY VOLTAGE TESTER
CONNECTION
SPECIFIED
CONDITION
Not applied
1
− 4
Open circuit
• Connect terminal 2
to the positive
battery terminal
• Connect terminal 3
to the negative
battery terminal
1
− 4
Less than 2 ohms
1
4
3
2
AC306645
2
1
3
4
FRONT OF
VEHICLE
FOG LIGHT RELAY
AB
CONNECTOR: A-05X
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
54B-402
STEP 5. Check the battery power supply circuit to the fog
light relay. Measure the voltage at fog light relay connector
A-05X.
CAUTION
The top and bottom of the fog light relay are difficult to
identify. Prior to inspection, confirm the triangle mark on
the relay box.
(1) Disconnect fog light 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 light relay
connector A-05X (terminals 1 and 2) and the battery.
Q: Is the wiring harness between fog light 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 lights illuminate normally.
AC305979 AB
CONNECTOR: A-05X
RELAY BOX SIDE
FRONT OF VEHICLE
AC209365
CONNECTOR A-05X
(RELAY BOX SIDE)
EK
AC305979 AB
CONNECTOR: A-05X
RELAY BOX SIDE
FRONT OF VEHICLE
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
54B-403
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
. Verify that the fog lights illuminate normally.
STEP 8. Check the wiring harness between fog light relay
connector A-05X (terminal 3) and front-ECU connector
A-11X (terminal 11).
Q: Is the wiring harness between fog light 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 lights illuminate normally.
STEP 9. Replace the ECU.
(1) Replace the front-ECU.
(2) The fog lights should illuminate normally.
Q: Do the fog lights illuminate normally?
YES : No action is necessary and testing is complete.
NO : Replace the ETACS-ECU. Verify that the fog lights
illuminate normally.
AC305979 AB
CONNECTOR: A-05X
RELAY BOX SIDE
FRONT OF VEHICLE
AC305987AB
CONNECTORS: A-05X, A-11X
RELAY BOX SIDE
A-11X
A-05X
A-05X
A-11X
FRONT OF VEHICLE
RELAY BOX SIDE
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