Mitsubishi 380. Manual - part 25

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-97

Door ajar warning buzzer

The buzzer is sounded 4 times by the ETACS-ECU to warn the
driver if any door is open when the ignition is switched ON and
the vehicle speed reaches 8 km/h (5 mph) or faster. The buzzer
will continue to sound for 4 times even if the ignition, door sta-
tus, or vehicle speed requirements are not maintained.

NOTE: The warning buzzer can be customized on vehicles
equipped with a multi center display. Refer to

P.54B-486

Multi center display operation tone <vehicles with multi
center display >

The ETACS-ECU sounds the buzzer when the buzzer signal is
sent from the center display.

Turn-signal lamp buzzer

The ETACS-ECU sounds the buzzer in sync with the turn-sig-
nal lamps or hazard warning lamps.

NOTE: The turn-signal lamp buzzer can be customized on
vehicles equipped with a multi center display (middle grade
type). Refer to

P.54B-486

General circuit diagram for lamp reminder tone alarm function.

P.90-111

General circuit diagram for seat belt tone alarm function.

P.90-113

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-98

54B

INSPECTION PROCEDURE B-2: Tone Alarm: Light Reminder Tone Alarm Function does not Work
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

CIRCUIT OPERATION

The ETACS-ECU operates the light reminder tone
alarm function according to the following signals:

• Ignition switch (IG1): OFF

• Ignition key reminder switch: ON

• Front door switch (RH): ON
• Taillamp switch: ON
• Headlamp switch: ON

The ETACS-ECU operates the lamp reminder tone
alarm function under the following conditions:

• Ignition switch: "LOCK" (OFF) position

• Ignition key: Removed from the ignition key cylin-

der

• Driver’s door: open
• Taillamps or headlamps: ON

TECHNICAL DESCRIPTION (COMMENT)

If the function does not work normally, the input cir-
cuit system from the switches or the ETACS-ECU
may be defective (refer to "CIRCUIT OPERATION").

TROUBLESHOOTING HINTS

• 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 ETACS-ECU may be defective

• Refer to circuit diagrams GROUP-

• Refer to configuration diagrams GROUP-

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

Light Reminder Tone Alarm Function

ETACS-

ECU

· DRIVER'S DOOR SWITCH

· HEADLIGHT SWITCH

· IGNITION SWITCH (IG1)

· TAILLIGHT SWITCH

INPUT SIGNAL

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-99

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

• MB991822: Test Probe Harness

STEP 1. Use diagnostic tool MB991958 to select "ECU
COMM Check" on the SWS monitor display.
Check the following ECUs:

• ETACS-ECU

• Column switch (column-ECU)

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. Connect special tool MB991910 before con-
necting 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

monitor

P.54B-13

(2) Turn the ignition switch to the "LOCK" (OFF) 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" menus for both the "ETACS ECU" and the
"COLUMN ECU" menus.

Q: Is "OK" displayed for both the "ETACS ECU" and

"COLUMN ECU" menus?
"OK" is displayed for all the items : Go to Step 2.
"NG" is displayed for the "ETACS ECU" menu : Refer to

Inspection Procedure A-3 "Communication with the
ETACS-ECU is not possible

P.54B-74

"NG" is displayed for the "COLUMN ECU" menu : Refer

to Inspection Procedure A-2 "Communication with the
column switch (column-ECU) is not possible

P.54B-68

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-100

STEP 2. Check the input signal by using "FUNCTION
DIAG." menu of the SWS monitor.
Check the input signals from the following switches:

• Ignition switch: OFF (key removed)
• Lighting switch: TAIL or HEAD

• Driver’s door: open

• Front passenger's door: closed

(1) Operate diagnostic tool MB991958 according to the

procedure below to display "LGT MONI. ALRM."
a. Select "Interactive Diagnosis."
b. Select "System Select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f.

Select "BUZZER."

g. Select "LGT MONI. ALRM."

(2) Check that normal conditions are displayed for the items

described in the table below.

NOTE: diagnostic tool MB991958 display changes when
the driver's or the front passenger's door is opened. If any of
the doors is open, the system cannot be checked correctly.

Q: Does diagnostic tool MB991958 display "HEADLAMP

SW", "TAILLAMP SW", "IG SW IG1", "FRONT DOOR
SW", "H/L AUTO-CUT" and "BUZZER" as normal
condition?
Normal conditions are displayed for all the items :

Replace the ETACS-ECU. The lamp reminder tone
alarm function should now work normally.

Normal condition is not displayed for "HEADLIGHT SW"
:

Refer to Inspection Procedure M-5 "ETACS-ECU
does not receive any signal from the headlamp switch

P.54B-420

Normal condition is not displayed for "TAILLIGHT SW" :

Refer to Inspection Procedure M-5 "ETACS-ECU
does not receive any signal from the taillamp switch

P.54B-420

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)

P.54B-408

ITEM NO.

ITEM NAME

NORMAL CONDITION

ITEM 00

HEADLAMP SW

Either of items is ON

ITEM 01

TAILLAMP SW

ITEM 30

IG SW IG1

OFF

ITEM 32

FRONT DOOR SW

ITEM 35

H/L AUTO-CUT

OFF

ITEM 43

BUZZER

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

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