Mitsubishi 380. Manual - part 87

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

AC305979

CONNECTOR: A-05X

AC

16DB450A

CONNECTOR: A-22

A-22 (B)

A-22

16DB451A

CONNECTOTR: A-28

A-28 (B)

A-28 

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.

16DB450A

CONNECTOR: A-22

A-22 (B)

A-22

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.

16DB450A

CONNECTOR: A-22

A-22 (B)

A-22

AC209364FZ

CONNECTOR A-22
(HARNESS SIDE)

16DB450A

CONNECTOR: A-22

A-22 (B)

A-22

AC305979 AB

CONNECTOR: A-05X

RELAY BOX SIDE

FRONT OF VEHICLE

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.

AC305979 AB

CONNECTOR: A-05X

RELAY BOX SIDE

FRONT OF VEHICLE

16DB450A

CONNECTOR: A-22

A-22 (B)

A-22

16DB451A

CONNECTOTR: A-28

A-28 (B)

A-28