Mitsubishi Galant 9G. Manual — part 127

INPUT SIGNAL PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-504

STEP 5. 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 6.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. If the equipment described in "CIRCUIT

OPERATION" work normally, the input signal from the
hazard warning light switch should be normal.

STEP 6. Check the wiring harness between hazard warning
light switch connector C-08 (terminal 1) and ETACS-ECU
connector C-218 (terminal 55).
Q: Is the wiring harness between hazard warning light

switch connector C-08 (terminal 1) and ETACS-ECU
connector C-218 (terminal 55) in good condition?
YES : Replace the ETACS-ECU. If the equipment described

in "CIRCUIT OPERATION" work normally, the input
signal from the hazard warning light switch should be
normal.

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. If the
equipment described in "CIRCUIT OPERATION" work
normally, the input signal from the hazard warning
light switch should be normal.

AC305413AN

CONNECTOR: C-218

JUNCTION BLOCK
(REAR VIEW)

C-218 (GR)

HARNESS SIDE

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AC305233AS

CONNECTOR: C-08

HARNESS SIDE

AC305413AN

CONNECTOR: C-218

JUNCTION BLOCK
(REAR VIEW)

C-218 (GR)

HARNESS SIDE

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INPUT SIGNAL PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-505

INSPECTION PROCEDURE N-3: ETACS-ECU does not receive any signal from any of the door
switches.

JUNCTION BLOCK

ETACS-
ECU

JUNCTION BLOCK SIDE

REAR DOOR
SWITCH (RH)

FRONT DOOR
SWITCH (RH)

FRONT DOOR
SWITCH (LH)

REAR DOOR
SWITCH (LH)

Door Switches Input Circuit

AC305233 DC

CONNECTOR: C-28

AC305415AL

CONNECTOR: C-204

JUNCTION BLOCK

(FRONT VIEW)

INPUT SIGNAL PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-506

.

CIRCUIT OPERATION

The ETACS-ECU operates the following functions or
systems according to signal from the front or rear
door switches:

• Ignition key reminder tone alarm function <front

door switch (LH)>

• Light reminder tone alarm function <front door

switch (LH)>

• Door ajar warning buzzer <all door switches>

• Ignition key reminder tone alarm <front door

switches>

• Power window timer function <front door

switches>

• Sunroof timer function <front door switch (LH)>

• Headlight automatic shutdown function <front

door switch (LH)>

• Keyless entry system <all door switches>

• Timer lock <all door switches>

• Dome light <all door switches>

• Interior light automatic-shutdown function <all

door switches>

• Ignition key hole illumination light <front door

switch (LH)>

• Door-ajar indicator light <all door switches>

.

TECHNICAL DESCRIPTION (COMMENT)

If the signal is not normal, the functions or systems
described in "CIRCUIT OPERATION" do not work
normally. If the signal is not normal, the front or rear
door switches or the ETACS-ECU may be defective.

.

TROUBLESHOOTING HINTS

• The front or rear door switches may be defective

• 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

AC305413

C-219

C-217

CONNECTORS: C-217, C-219

AF

JUNCTION BLOCK

(REAR VIEW)

AC400530

AN

CONNECTOR: D-06

AC400532

AI

CONNECTOR: D-16

INPUT SIGNAL PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-507

STEP 1. Check the input signal (by using the pulse check
mode of the monitor).
Check the input signals from the all door switches.

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 the scan tool MB991958. Refer to "How to connect

SWS monitor

P.54B-13

."

(2) 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."

(3) Check that scan tool MB991958 sounds.
Q: When the front and rear doors are opened/closed, does

the scan tool MB991958 sound?
When the front doors are opened and closed, scan tool
MB991958 does not sound. : Refer to Inspection

Procedure M-4 "ETACS-ECU does not receive any
signal from the front door switches

P.54B-477

."

When the rear door (LH) is opened and closed, scan tool
MB991958 does not sound. : Go to Step 2.
When the rear door (RH) is opened and closed, scan
tool MB991958 does not sound. : Go to Step 7.

STEP 2. Check rear door switch (LH) connector D-16 for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is rear door switch (LH) connector D-16 in good

condition?
YES : Go to Step 3.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. If the functions described in "CIRCUIT

OPERATION" work normally, the input signal from the
rear door switch (LH) should be normal.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC400532

AJ

CONNECTOR: D-16

HARNESS SIDE