Mitsubishi Galant 9G. Manual — part 32

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-124

STEP 5. Check the input signal by using "FUNCTION
DIAG." menu of the SWS monitor.
Check the input signals from the following switches:

• Ignition switch: ON

• Driver’s door: Open

• Vehicle speed: 8 km/h (5 mph) or more

(1) Operate scan tool MB991958 according to the procedure

below to display "OTHER ALARM"
a. Select "Interactive Diagnosis."
b. Select "System Select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f. Select "BUZZER."
g. Select "OTHER ALARM"

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

described in the table below.
NOTE: The scan tool MB991958 display changes when the
driver's or the front passenger's door is opened. If any of the
doors are open, the system cannot be checked correctly.

Q: Does scan tool MB991958 display the items "IG SW

(IG1)", "FRONT DOOR SW" and "BUZZER" as normal
condition?
Normal conditions are displayed for all the items : Go to

Step 6.

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-470

."

Normal condition is not displayed for "FRONT DOOR
SW" : Refer to Inspection Procedure M-4 "ETACS-ECU

does not receive any signal from the front door
switches

P.54B-477

."

Normal condition is not displayed for "BUZZER" :

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

ITEM NO.

ITEM NAME

NORMAL
CONDITION

ITEM 30

IG SW (IG1)

ON

ITEM 32

FRONT DOOR SW

ON

ITEM 43

BUZZER

ON

AC305411AB

MB991910

DATA LINK

CONNECTOR

MB991827

MB991824

MB991806

MB991812

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

AB

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-125

STEP 6. Check the input signal (by using the pulse check
mode of the monitor).
Check the following switches and input signals:

• Doors switches

(1) Operate scan 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."

(2) Check if scan tool MB991958 sounds or not.

Q: When any door switch is operated, does scan tool

MB991958 sound?
YES : Replace the ETACS-ECU. The door ajar warning

buzzer function should now work normally.

NO : Refer to Inspection Procedure N-3 "ETACS-ECU

does not receive any signal from any of the door
switches

P.54B-505

."

ITEM NAME

CONDITION

door switch

Open or close one of the doors

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-126

INSPECTION PROCEDURE B-5: Tone Alarm: The Multi center Display does not Sound Normally When
it is Operated. <Multi center Display (Middle-grade Type)>

NOTE: This troubleshooting procedure requires the
use of scan tool MB991958 and SWS monitor kit
MB991813. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor

P.54B-15

."

.

CIRCUIT OPERATION

The ETACS-ECU sounds the buzzer when it
receives buzzer signal from the multi center display
(middle-grade type).

.

TECHNICAL DESCRIPTION (COMMENT)

If this function does not work normally, connector(s),
wiring harness in the CAN bus lines, the mid-
dle-grade multi center display unit or the
ETACS-ECU may be defective.

.

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

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: Scan 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: Probe Harness

STEP 1. Check the operation of the multi center display
(middle-grade type).
Q: Does the multi center display (middle-grade type) work

normally?
YES : Go to Step 2.
NO : First, replace the multi center display (middle-grade

type) unit.

ETACS-
ECU

MULTI CENTER
DISPLAY UNIT

CAN COMMUNICATION LINE
(CAN_L LINE)

CAN COMMUNICATION LINE
(CAN_H LINE)

Multi Center Display Annunciation Function

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-127

STEP 2. Using scan tool MB991958, diagnose the CAN bus
line.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan 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-14

).

STEP 3. Using scan tool MB991958, read the multi center
display (middle-grade type) diagnostic trouble code.
Check that a multi center display DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the multi center display DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the multi center display unit (middle-grade

type) (Refer to GROUP 54A, Diagnosis

P.54A-224

).

NO : Go to Step 4.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827