Mitsubishi Galant 9G. Manual — part 111

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-440

STEP 3. 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 4.
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

AB

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-441

STEP 4. 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 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 item

described in the table below.

Q: Does the scan tool MB991958 display "IG SW (IG1)" as

normal condition?
YES : Go to Step 5.
NO : Refer to Inspection Procedure M-2 "ETACS-ECU

does not receive any signal from the ignition switch
(IG1)

P.54B-470

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ITEM NO.

ITEM NAME

NORMAL CONDITION

ITEM 30

IG SW (IG1)

OFF

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-442

STEP 5. Check the input signal (by using the pulse check
mode of the monitor).
Check the input signals from the following switches:

• Key reminder switch

• Door switches

• Trunk lid latch assembly

(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 the

trunk lid is operated, does scan tool MB991958 sound?
Buzzer of scan tool MB991958 sounds normally. :

Replace the ETACS-ECU. Verify that the dome light
dimming function works normally.

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 a
signal from the key reminder switch

P.54B-497

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Scan tool MB991958 does not sound whenever a door
switch is operated : Refer to Inspection Procedure N-3

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

P.54B-505

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When the trunk lid is opened and closed, scan tool
MB991958 does not sound. : Refer to Inspection

Procedure N-7 "ETACS-ECU does not receive any
signal from trunk lid latch assembly

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ITEM NAME

CONDITION

key reminder switch

Remove and reinsert the ignition
key

door switches

Open or close one of the doors

trunk lid latch assembly

Open or close the trunk lid

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-443

INSPECTION PROCEDURE K-4: Interior Light: The ignition key hole illumination light does not
illuminate or go out normally.

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

."

BATTERY

RELAY
BOX

KEY REMINDER
SWITCH

IGNITION
KEY HOLE
ILLUMINATION
LIGHT

· FRONT DOOR SWITCH
· IGNITION SWITCH (IG1)
· KEY REMINDER SWITCH

ETACS-
ECU

JOINT
CONNECTOR (1)

Ignition Key Hole Illumination Light Circuit

AC305231

C-01

C-29

CONNECTORS: C-01, C-29

BI

AC305413AL

CONNECTOR: C-218

C-218 (GR)