Mitsubishi 380. Manual - part 80

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-317

DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

STEP 1. Check the hazard warning lamp.

Q: Which turn-signal lamp does not illuminate?

front turn-signal lamp (LH) : Go to Step 2.
side turn-signal lamp (LH) : Go to Step 8.
front turn-signal lamp (RH) : Go to Step 14.
side turn-signal lamp (RH) : Go to Step 20.
rear combination lamp (LH) : Go to Step 26.
rear combination lamp (RH) : Go to Step 32.
Turn-signal indicators : Refer to Inspection Procedure I-4 

"The turn-signal lamp indicator does not illuminate 
normally 

P.54B-335

."

LH side only : Refer to Inspection Procedure I-1 

"Turn-signal lamps do not flash when the turn-signal 
lamp switch is turned on 

P.54B-310

."

RH side only : Refer to Inspection Procedure I-1 

"Turn-signal lamps do not flash when the turn-signal 
lamp switch is turned on 

P.54B-310

."

Both LH and RH sides : Refer to Inspection Procedure I-2 

"Hazard warning lamps do not flash when the hazard 
warning lamp switch is turned on 

P.54B-314

."

STEP 2. Check front combination lamp (LH) connector 
A-18 for loose, corroded or damaged terminals, or 
terminals pushed back in the connector.
Q: Is front combination lamp (LH) connector A-18 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

. Verify that the turn-signal lamps illuminate 

normally.

STEP 3. Check the front turn-signal lamp bulb (LH).
(1) Remove the front turn-signal (LH) lamp bulb.
(2) Verify that the front turn-signal lamp bulb (LH) is not 

damaged or burned out.

Q: Is the front turn-signal (LH) lamp bulb in good 

condition?
YES : Go to Step 4.
NO :  Replace the front turn-signal (LH) lamp bulb. Verify 

that the turn-signal lamps illuminate normally.

16DB443A

CONNECTOR: A-18, A-17

A-18

A-17

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-318

STEP 4. Check the ground circuit to the ETACS-ECU. 
Measure the resistance at front combination lamp (LH) 
connector A-18.
(1) Disconnect front combination lamp (LH) connector A-18 

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 front 
combination lamp (LH) connector A-18 (terminal 2) and 
ground.
Q: Is the wiring harness between front combination lamp 

(LH) connector A-18 (terminal 2) and ground in good 
condition?
YES : Replace the front combination lamp socket (LH). 

Verify that the turn-signal lamps illuminate normally.

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 turn-signal lamps illuminate normally.

16DB443A

CONNECTOR: A-18, A-17

A-18

A-17

16DB445A

CONNECTOR A-18
(HARNESS SIDE)

16DB443A

CONNECTOR: A-18, A-17

A-18

A-17

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-319

STEP 6. Check ETACS-ECU connector C-219 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is ETACS-ECU connector C-219 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

. Verify that the turn-signal lamps illuminate 

normally.

STEP 7. Check the wiring harness between front 
combination lamp (LH) connector A-18 (terminal 1) and 
ETACS-ECU connector C-219 (terminal 14).

16DB327A

CONNECTOR: C-219

JUNCTION BLOCK

(REAR VIEW)

16DB443A

CONNECTOR: A-18, A-17

A-18

A-17

16DB327A

CONNECTOR: C-219

JUNCTION BLOCK

(REAR VIEW)

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-320

NOTE: Also check junction block connector C-214 for loose, 
corroded, or damaged terminals, or terminals pushed back in 
the connector. If junction block connector C-214 is damaged, 
repair or replace the damaged component(s) as described in 
GROUP 00E, Harness Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between front combination lamp 

(LH) connector A-18 (terminal 1) and ETACS-ECU 
connector C-219 (terminal 14) in good condition?
YES : Replace the front combination lamp socket (LH). 

Verify that the turn-signal lamps illuminate normally.

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 turn-signal lamps illuminate normally.

STEP 8. Check side turn signal- lamp (LH) connector A-17 
for loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is side turn-signal lamp (LH) connector A-17 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

. Verify that the turn-signal lamps illuminate 

normally.

STEP 9. Check the side turn-signal lamp bulb (LH).
(1) Remove the side turn-signal (LH) lamp bulb.
(2) Verify that the side turn-signal lamp bulb (LH) is not 

damaged or burned out.

Q: Is the side turn-signal (LH) lamp bulb in good 

condition?
YES : Go to Step 10.
NO :  Replace the side turn-signal (LH) lamp bulb. Verify 

that the turn-signal lamps illuminate normally.

16DB327A

CONNECTOR: C-219

JUNCTION BLOCK

(REAR VIEW)

16DB443A

CONNECTOR: A-18, A-17

A-18

A-17