Mitsubishi 380. Manual - part 79

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-313

STEP 7. Check the input signal by using "FUNCTION
DIAG." menu of the SWS monitor.
Check the input signals from the following switches:

• Ignition switch: ON

• Turn-signal lamp switch: RH

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 "TURN SIG.RH."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f.

Select "TURN SIGNAL."

g. Select "TURN SIG.RH."

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

described in the table below.

Q: Does the Diagnostic Tool MB991958 display the items

"T/S RH SW" and "IG SW (IG1)" as normal condition?
Normal conditions are displayed for all the items : Go to

Step 8.

Normal condition is not displayed for "T/S RH SW" :

Refer to Inspection Procedure M-5 "ETACS-ECU
does not receive any signal from the turn-signal lamp
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 10

T/S RH SW

ITEM 30

IG SW (IG1)

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-314

STEP 8. Check the input signal by using "FUNCTION
DIAG." menu of the SWS monitor.
If the Ignition switch is turned to the "ON" position and the
turn-signal lamp switch (LH) is turned on, normal conditions
should be displayed for the items described in the table below.
(1) Operate Diagnostic Tool MB991958 according to the

procedure below to display "TURN SIG.LH."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f.

Select "TURN SIGNAL."

g. Select "TURN SIG.LH."

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

described in the table below.

Q: Do the Diagnostic Tool display the item "T/S LH SW" as

normal condition?
YES : Replace the ETACS-ECU. Verify that the turn-signal

lamps illuminate normally.

NO : Refer to Inspection Procedure M-5 "ETACS-ECU

does not receive any signal from the turn-signal lamp
switch

P.54B-420

INSPECTION PROCEDURE I-2: Flasher Timer: Hazard warning lamps do not flash when the hazard
warning lamp switch is turned on.

CIRCUIT OPERATION

If the ETACS-ECU receives "ON" signal from the
hazard warning lamp switch, the ETACS-ECU turns
on the flasher timer (incorporated in the
ETACS-ECU), thus causing the turn-signal lamps to
flash.

TECHNICAL DESCRIPTION (COMMENT)

If the hazard warning lamps do not flash, the power
supply line to the ETACS-ECU (dedicated to the
turn-signal lamps) or the ETACS-ECU may be defec-
tive.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

• Refer to configuration diagrams GROUP-

• 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

ITEM No.

ITEM NAME

NORMAL CONDITION

ITEM 11

T/S LH SW

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-315

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

STEP 1. Check the turn-signal lamps.

Q: Do the turn-signal lamps illuminate normally?

YES : Go to Step 2.
NO : Refer to Inspection Procedure I-1 "Turn-signal lamps

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

P.54B-310

STEP 2. Check the input signal (by using the pulse check
mode of the monitor).
Check input signal from the hazard warning lamp switch.

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 the special tool. Refer to "How to connect SWS

monitor

P.54B-13

(2) Operate Diagnostic Tool MB991958 according to the

procedure below to display "Pulse check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "Pulse Checking."

(3) Check that Diagnostic Tool MB991958 sounds when the

hazard warning lamp switch is turned from "OFF" to "ON."

Q: Does Diagnostic Tool MB991958 sound when the hazard

warning lamp switch is turned from "OFF" to "ON"?
YES : Replace the ETACS-ECU. Verify that the hazard

warning lamps illuminate normally.

NO : Refer to Inspection Procedure N-2 "ETACS-ECU

does not receive any signal from the hazard warning
lamp switch

P.54B-436

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-316

INSPECTION PROCEDURE I-3: Flasher Timer: One of the turn-signal lamps does not illuminate.

TECHNICAL DESCRIPTION (COMMENT)

If the right or left turn-signal lamp does not illuminate,
their bulb may be defective.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

• Refer to configuration diagrams GROUP-

• The turn-signal lamp bulb may be defective

• The wiring harness or connectors may have

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

16DB443A

CONNECTOR: A-18, A-17

A-18

A-17

16DB444A

CONNECTOR: A-34, A-35

A-34

A-35

16DB327A

CONNECTOR: C-219

JUNCTION BLOCK

(REAR VIEW)

AC305260

F-09

F-03

CONNECTORS: F-03, F-09

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