Mitsubishi Galant 9G. Manual — part 107

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-424

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

• Ignition switch: ON or START

• Driver’s or front passenger’s door: open

(1) Operate scan tool MB991958 according to the procedure

below to display "ETACS ECU."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Data List."
f. Select "ETACS ECU."

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

described in the table below.

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

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

Step 3.

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

."

ITEM NO.

ITEM NAME

NORMAL CONDITION

ITEM 30

IG SW (IG1)

ON

ITEM 32

FRONT DOOR SW

ON

AC305411AB

MB991910

DATA LINK

CONNECTOR

MB991827

MB991824

MB991806

MB991812

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

AB

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-425

STEP 3. Check the input signal (by using the pulse check
mode of the monitor).
Check the following switches and input signals:

• Key reminder switch

• Interior light loaded signal

• Door 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 the key reminder switch, any door switch or

interior light is operated, does scan tool MB991958
sound?
Buzzer of scan tool MB991958 sounds normally. : Go to

Step 4.

Scan tool MB991958 does not sound when the ignition
key is removed and reinserted : Refer to Inspection

Procedure N-1 "ETACS-ECU does not receive any
signal from the key reminder switch

P.54B-497

."

When one of the interior lights is illuminated, scan tool
MB991958 does not sound : Refer to Inspection

Procedure N-9 "ETACS-ECU does not receive any
interior light loaded signal

P.54B-542

."

When one of the doors is opened and closed, scan tool
MB991958 does not sound : Refer to Inspection

Procedure N-3 "ETACS-ECU does not receive any
signal from any of the door switches

P.54B-505

."

STEP 4. 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 5.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. Verify that the dome light illuminates

normally.

ITEM NAME

CONDITION

key reminder switch

Remove and reinsert the ignition
key

interior light loaded signal Turn on one of the interior lights

door switches

Open or close one of the doors

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305413 AG

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-426

STEP 5. Check the wiring harness between map light
assembly connector D-02 (terminal 1) <without sunroof>
or overhead console assembly connector D-03 (terminal 1)
<with sunroof> and ETACS-ECU connector C-219 (terminal
6).

NOTE: Also check junction block connector C-205 for loose,
corroded, or damaged terminals, or terminals pushed back in
the connector. If junction block connector C-205 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 map light assembly

connector D-02 (terminal 1) <without sunroof> or
overhead console assembly connector D-03 (terminal 1)
<with sunroof> and ETACS-ECU connector C-219
(terminal 6) in good condition?
YES : Replace the ETACS-ECU. Verify that the dome light

illuminates 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 dome light illuminates normally.

AC305413 AG

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

AC400530

CONNECTORS: D-02, D-03

D-02
D-03

AE

D-02

D-03

HARNESS SIDE

AC305415

C-205

CONNECTOR: C-205

AT

JUNCTION BLOCK
(FRONT VIEW)

HARNESS SIDE

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-427

INSPECTION PROCEDURE K-2: Interior Light: The front dome light, rear dome light or trunk light do
not illuminate or go out normally.

JUNCTION BLOCK

ETACS-
ECU

TRUNK
LIGHT

MAP LIGHT
ASSEMBLY

OVERHEAD
CONSOLE
ASSEMBLY

REAR DOME
LIGHT

JUNCTION
BLOCK SIDE

NOTE

WITHOUT SUNROOF
WITH SUNROOF

Interior Light Circuit