Mitsubishi 380. Manual - part 89

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-353

STEP 3. Using Diagnostic Tool MB991958, read the 
combination meter diagnostic trouble code.
(1) Check whether a combination meter-related DTC is set.
(2) Turn the ignition switch to the "ON" position.

Check whether the combination meter-related DTC is set.

(3) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES : Diagnose the combination meter. Refer to 

P.54A-48

.

NO :  Go to Step 4.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-354

STEP 4. Use Diagnostic Tool MB991958 to select "ECU 
COMM Check" on the SWS monitor display. 
Check the ETACS-ECU.

CAUTION

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 SWS monitor. Refer to "How to connect SWS 

monitor 

P.54B-13

."

(2) Turn the ignition switch to the "ON" position.
(3) Operate Diagnostic Tool MB991958 according to the 

procedure below to display "ECU COMM Check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "ECU COMM Check."

(4) Diagnostic Tool MB991958 should show "OK" on the "ECU 

COMM Check" menu for the "ETACS ECU" menu.

Q: Is "OK" displayed for the "ETACS ECU" menu?

YES : Go to Step 5.
NO :  Refer to Inspection Procedure A-3 "Communication 

with the ETACS-ECU is not possible 

P.54B-74

."

STEP 5. Replace the combination meter.
(1) Replace the combination meter.
(2) Check that the fog lamp indicator lamp illuminates normally.

Q: Is the fog lamp indicator lamp operating properly?

YES : No action is necessary and testing is complete.
NO :  Replace the ETACS-ECU. Check that the fog lamp 

indicator lamp illuminates normally.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC302210

COLUMN SWITCH 
CONNECTOR

COLUMN SWITCH 
CONNECTOR AT 
HARNESS SIDE 

MB991812

AB

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SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-355

54B

INTERIOR LAMP

GENERAL DESCRIPTION CONCERNING THE INTERIOR LAMP

M1549021800236

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

The following ECUs affect the functions and control 
of the interior lamps.

Interior lamp control function

The ETACS-ECU controls the interior lamps by turn-
ing them on and off in the following way:

• When a door is opened with the ignition switch 

off, the interior lamps up to a luminance of 100 
percent. When a door is closed, the interior lamps 
dims at a luminance of 65 percent, and goes off 
30 seconds later. However if the ignition switch is 
turned ON or if a door is locked while the interior 
lamps is dimming, the dome lamp will go off at 
that point.

• When a door is opened with the ignition switch 

ON, the interior lamps up at a luminance of 100 
percent. When a door is closed, the interior lamps 
go off.

• When the ignition key is removed with all doors 

closed, the interior lamps up at a luminance of 
100 percent, and goes off 30 seconds later. How-
ever if the ignition key is inserted again or if a 
door is locked while the interior lamps is lighting, 
the interior lamps will go off at that point.

• To check keyless entry operations more easily, 

the interior lamps is flashed once when the doors 
are locked. When the doors are unlocked, the 
interior lamps at a luminance of 100 percent, and 
go off 15 seconds later.

NOTE: The dimmer function can be customised on 
vehicles equipped with a multi center display (middle 
grade type).  Refer to 

P.54B-486

.

NOTE: The dotted lines indicate that lighting mode 
when the ignition switch is turned ON, door is locked, 
or any door is opened during the timer illumination 
time.

FUNCTION

CONTROL ECU

Interior lamp control function

ETACS-ECU

Interior lamp automatic-shutoff function

ETACS-ECU

Ignition key hole illumination lamp function

ETACS-ECU

Door ajar indicator

ETACS-ECU

Seat belt indicator

ETACS-ECU

AC101555AF

ON

ACC

LOCK (OFF)

Key removed

ON (Any door is open)

OFF (All doors are closed)

LOCK

OFF

UNLOCK

100 %

65 %

0 %

t1: 30 seconds

t2: 15 seconds

t1

t1

t2

Ignition switch

Door switch

Keyless entry system

door lock or unlock signal

Interior light intensity

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SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-356

Interior lamp automatic-shutoff function

Illuminated interior lamps such as the front dome 
lamp, etc. (all lamps using the dome lamp fuse as the 
power supply) will automatically go off in the follow-
ing conditions to prevent the battery from discharging 
as a result of forgetting to turn off the lamps or 
incomplete closing of the door.

• When the ignition switch is turned off and more 

than 30 minutes pass with the interior lamp illumi-
nated, the interior lamps will go off automatically.

• When the ignition switch is turned off and one of 

the door switches remains open for 30 minutes 
continuously, the interior lamps will go off auto-
matically.

NOTE: The interior lamp automatic shutoff function 
can be customised on vehicles equipped with a multi 
center display (middle grade type).  Refer to 

P.54B-486

.

Ignition key hole illumination lamp function

The ignition key hole illumination lamp illuminates when the 
driver's door is opened with the ignition switch off, and for 30 
seconds after the driver's door is closed. It also illuminates for 
30 seconds after the ignition key is pulled out. In any case, it 
goes out when the ignition switch is turned on.

Door ajar indicator

The combination meter receives the signal sent from the 
ETACS-ECU about whether each door is open or closed and 
turns the door ajar indicator on and off. While the door ajar indi-
cator is illuminated, the door ajar warning function is activated 
and the door ajar indicator flashes 4 times. If the door remains 
open even after the 4 warning flashes, the door ajar indicator 
will be illuminated again. And when the interior lamp auto-
matic-shutoff function is activated, the door ajar indicator is 
extinguished.

AC210856AB

T1

T2

T2

ON

ON (Any door is open)

Illuminated

ACC

OFF

Extinguished

Ignition switch

Door switch

Interior light

ON

DOOR

Dome light switch

T1: 30 minutes
T2: Within 30 minutes

T1

T2

OFF (All doors are closed)

T1