Mitsubishi 380. Manual - part 88

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.

16DB451A

CONNECTOTR: A-28

A-28 (B)

A-28 

AC209364GA

CONNECTOR A-28
(HARNESS SIDE)

16DB451A

CONNECTOTR: A-28

A-28 (B)

A-28 

AC305979 AB

CONNECTOR: A-05X

RELAY BOX SIDE

FRONT OF VEHICLE

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

."

.

AC305979 AB

CONNECTOR: A-05X

RELAY BOX SIDE

FRONT OF VEHICLE

16DB451A

CONNECTOTR: A-28

A-28 (B)

A-28 

ETACS-

ECU

COMBINATION

METER

FOG LIGHT

SWITCH

CAN COMMUNICATION LINE

(CAN_H LINE)

CAN COMMUNICATION LINE

(CAN_L LINE)

Fog Light Indicator Light Circuit

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-351

CIRCUIT OPERATION

At the same time that the fog lamps are illuminated, 
the ETACS-ECU sends a signal to illuminate the fog 
lamp indicator via the CAN bus line.

.

TECHNICAL DESCRIPTION (COMMENT)

If the fog lamp indicator does not illuminate normally, 
connector(s), wiring harness in the CAN bus lines, 
the ETACS-ECU or the combination meter may be 
defective.

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• Trouble in input signal system

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

• The combination meter may be defective

• The ETACS-ECU may be defective

.

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-352

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: Diagnostic Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

• MB991813: SWS Monitor Kit

• MB991806: SWS Monitor Cartridge

• MB991812: SWS Monitor Harness (For Column-ECU)

• MB991822: Test Probe Harness

STEP 1. Check the fog lamps.
When the fog lamp switch is operated, check that the fog lamps 
illuminate/go off normally.

Q: Are the fog lamps operating properly?

YES : Go to Step 2.
NO :  First, repair the fog lamps. Refer to Inspection 

Procedure J-3 "One of the fog lamps does not 
illuminate 

P.54B-345

."

STEP 2. Using Diagnostic Tool MB991958, diagnose the 
CAN bus line.

CAUTION

To prevent damage to Diagnostic Tool MB991958, always 
turn the ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting Diagnostic Tool 
MB991958.
(1) Connect Diagnostic Tool MB991958. Refer to "How to 

connect SWS monitor 

P.54B-13

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the CAN bus line found to be normal?

YES : Go to Step 3.
NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-15

).

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827