Mitsubishi Galant 9G. Manual — part 28

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-108

54B

INSPECTION PROCEDURE B-1: Tone Alarm: Ignition Key Reminder Tone Alarm Function does not
Work 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

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CIRCUIT OPERATION

The ETACS-ECU operates the ignition key reminder
tone alarm function, based on input signals from the
following switches:

• Ignition switch (IG1): OFF

• Key reminder switch: OFF

• Front door switch (LH): ON

The ETACS-ECU operates the ignition key reminder
tone alarm function under the following conditions:

• Ignition key position: "LOCK" (OFF) position

• Ignition key: Inserted in the ignition key cylinder

• Driver’s door: open

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TECHNICAL DESCRIPTION (COMMENT)

If the function does not work normally, the input cir-
cuit system from the switches or the ETACS-ECU
may be defective (refer to "CIRCUIT OPERATION").

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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

Ignition Key Reminder Tone Alarm Function

ETACS-
ECU

· DRIVER'S DOOR SWITCH
· IGNITION SWITCH (IG1)
· KEY REMINDER SWITCH

INPUT SIGNAL

<<PREVIOUS

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-109

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

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(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

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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-110

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

• Ignition switch: OFF (key inserted)

• Driver’s door: open

• Front passenger's door: closed

(1) Operate scan tool MB991958 according to the procedure

below to display "KEY RMND. ALM."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f. Select "BUZZER."
g. Select "KEY RMND. ALM."

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

described in the table below.
NOTE: Scan tool MB991958 display changes when the
driver's or the front passenger's door is opened. If any of the
doors is 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 :

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

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

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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

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Normal condition is not displayed for "BUZZER" : Go to

Step 3.

ITEM NO.

ITEM NAME

NORMAL
CONDITION

ITEM 30

IG SW (IG1)

OFF

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-111

STEP 3. Check the input signal (by using the pulse check
mode of the monitor).
Check the input signals from the key reminder switch.

• Check whether scan tool MB991958 sounds or not when

the ignition key is removed.

(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."

Q: Does scan tool MB991958 sound when the ignition key

is removed and reinserted?
YES : Replace the ETACS-ECU. The ignition key reminder

tone alarm function should now work normally.

NO : Refer to Inspection Procedure N-1 "ETACS-ECU

does not receive any signal from the key reminder
switch

P.54B-497

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AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827