Content .. 110 111 112 113 ..

Mitsubishi Galant 9G. Manual - part 112

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-444

CIRCUIT OPERATION

• When the driver's door is opened with the ignition

switch at "ACC" position, the ETACS-ECU illumi-
nates the ignition key hole illumination light.

• The ignition key hole illumination light goes out in

30 seconds after the driver's door is closed. The
ignition key hole illumination light remains illumi-
nated for 30 seconds after the ignition key is
pulled out.

• The ETACS-ECU operates the ignition key hole

illumination light according to the input signals
from the following switches:

• Ignition switch (IG1): OFF

• Key reminder switch: OFF

• Interior light loaded signal: ON

• Vehicle condition:

• Ignition switch: "LOCK" (OFF) or "ACC" posi-

tion

• Ignition key: Removed from the ignition key

cylinder

• Driver’s door: Opened or closed

TECHNICAL DESCRIPTION (COMMENT)

If the ignition key hole illumination light does not illu-
minate, the input circuits from the switches described
in "CIRCUIT OPERATION", the key reminder switch
(ignition key hole illumination light bulb) 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

AC305235

CONNECTOR: C-310

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-445

STEP 1. Use scan tool MB991958 to select "ECU COMM
Check" on the SWS monitor display.
Check the ETACS-ECU.

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. 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 special tool. Refer to "How to connect SWS

monitor

P.54B-13

(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Operate scan 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) Scan 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 2.
NO : Refer to Inspection Procedure A-3 "Communication

with the ETACS-ECU is not possible

P.54B-78

AC305411AB

MB991910

DATA LINK

CONNECTOR

MB991827

MB991824

MB991806

MB991812

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-446

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: OFF

• Driver's door: open

• Front passenger's door: closed

(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)

OFF

ITEM 32

FRONT DOOR SW

AC305411AB

MB991910

DATA LINK

CONNECTOR

MB991827

MB991824

MB991806

MB991812

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-447

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

(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) When the switches (see table below), which are applicable

for the input signal check, are operated, check if scan tool
MB991958 sounds or not.

Q: When the key reminder switch and the interior light are

operated, does scan tool MB991958 sound in each
case?
Buzzer of scan tool MB991958 sounds normally. : Go to

Step 4.

When the ignition key is removed and reinserted, scan
tool MB991958 does not sound : 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

STEP 4. Check ETACS-ECU connector C-218 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector C-218 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 ignition key hole illumination

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

AC305412

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305413AN

CONNECTOR: C-218

JUNCTION BLOCK
(REAR VIEW)

C-218 (GR)

HARNESS SIDE

Content .. 110 111 112 113 ..