Mitsubishi Galant. Manual — part 702

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-203

CIRCUIT OPERATION
The ETACS-ECU operates various functions
according to the input signal from the driver's or front
passenger's door switch.

TECHNICAL DESCRIPTION (COMMENT)
The driver's and front passenger's door switch and
door switches are used to operate the following
devices or systems:

•

Ignition key reminder tone alarm function (driver's
door switch only)

•

Light reminder tone alarm function (driver's door
switch only)

•

Forgotten key prevention function (driver's and
front passenger's door switch only)

•

Power window timer function (driver's and front
passenger's door switch only)

•

Keyless entry system <vehicles with keyless
entry system> (door switch)

•

Dome light (door switch)

•

Theft-alarm system <vehicles with theft-alarm
system> (door switch)

If the signal fails, these devices will not work
normally.

TROUBLESHOOTING HINTS

•

Malfunction of the driver's, front passenger's or
rear door switch

•

Malfunction of the ETACS-ECU

•

Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:

•

MB991223: Test Harness Set

•

MB991502: Scan Tool (MUT-II)

AC003415 AC

CONNECTOR: C-71

CONNECTOR
BLOCK (RH)

AC003082 AT

JUNCTION BLOCK
(FRONT VIEW)

CONNECTORS: C-78, C-82

C-78

C-82

AC003080 AJ

JUNCTION BLOCK
(REAR VIEW)

CONNECTORS: C-86, C-87

C-87

C-86

AC003084 AD

D-21

D-08

CONNECTORS: D-08, D-21

AC003085 AB

F-14

CONNECTORS: F-08, F-14

F-08

SWS DIAGNOSIS

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-204

•

MB991529: Diagnostic Trouble Code Check Harness

STEP 1. Check the door switch.

Q: Is the door switch in good condition?

YES : Go to Step 2.
NO : Replace it. The driver's and front passenger's door

switch and door switches input signal should be able
to be checked and the functions, which are described
in the "Technical Description (comment)," should work
normally.

STEP 2. Check the door switch installation state.

NOTE: The door switch is grounded to the body through the
mounting screws.
Remove the cap and measure the resistance between the
lower metal part and the ground.

Q: Is the resistance less than 2 ohm?

YES : Go to Step 3.
NO : Check the installation state and repair. The driver's

and front passenger's door switch and door switches
input signal should be able to be checked and the
functions, which are described in the "Technical
Description (comment)," should work normally.

STEP 3. Check the location of malfunction.

Q: Which door switch signal is not input?

Driver's door : Go to Step 4.
Front passenger's door : Go to Step 6.
Rear door (LH) : Go to Step 8.
Rear door (RH) : Go to Step 10.

SWITCH
POSITION

TESTER
CONNECTION

SPECIFIED
CONDITION

Released

1

−

2

Continuity

Pressed

−

No continuity

1 2 3

ACX01865 AC

ON

OFF

ACX01600AB

METAL PORTION

CUP

SWS DIAGNOSIS

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-205

STEP 4. Check driver's door switch connector D-21 and
ETACS-ECU connector C-86 for damage.
Q: Are driver's door switch connector D-21 and ETACS-

ECU connector C-86 in good condition?
YES : Go to Step 5.
NO : Repair or replace them. Refer to GROUP 00E,

Harness Connector Inspection

P.00E-2

. The driver's

door switch input signal should be able to be checked
and the functions, which are described in the
"Technical Description (comment)," should work
normally.

STEP 5. Check the harness wires between driver's door
switch connector D-21 and ETACS-ECU connector C-86.
NOTE: After checking junction block connector C-87, check the
wires. If junction block connector C-87 is damaged, repair or
replace it. Refer to GROUP 00E, Harness Connector
Inspection

P.00E-2

.

Q: Is the harness wires between the driver's door switch

connector D-21 and ETACS-ECU connector C-86 in
good condition?
YES : Replace the ETACS-ECU. The driver's door switch

input signal should be able to be checked and the
functions, which are described in the "Technical
Description (comment)," should work normally.

NO : Repair them. The driver's door switch input signal

should be able to be checked and the functions,
which are described in the "Technical Description
(comment)," should work normally.

AC003080 AD

JUNCTION BLOCK
(REAR VIEW)

CONNECTOR: C-86

AC003084 AE

CONNECTOR: D-21

AC003080 AJ

JUNCTION BLOCK
(REAR VIEW)

CONNECTORS: C-86, C-87

C-87

C-86

AC003084 AE

CONNECTOR: D-21

SWS DIAGNOSIS

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-206

STEP 6. Check front passenger's door switch connector D-
08 and ETACS-ECU connectors C-82 and C-86 for damage.
Q: Are front passenger's door switch connector D-21 and

ETACS-ECU connectors C-82 and C-86 in good
condition?
YES : Go to Step 7.
NO : Repair or replace them. Refer to GROUP 00E,

Harness Connector Inspection

P.00E-2

. The front

passenger's door switch input signal should be able to
be checked and the functions, which are described in
the "Technical Description (comment)," should work
normally.

AC003082AC

JUNCTION BLOCK
(FRONT VIEW)

CONNECTOR: C-82

AC003080 AD

JUNCTION BLOCK
(REAR VIEW)

CONNECTOR: C-86

AC003084 AF

CONNECTOR: D-08