Mitsubishi Galant. Manual — part 717

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-263

STEP 3. Check the harness wire between column switch
connector C-60 and ETACS-ECU connector C-82.
Q: Is the harness wire between column switch connector

C-60 and ETACS-ECU connector C-82 in good
condition?
YES : Go to 4.
NO : Repair it. Check that the input signal from the

windshield intermittent wiper interval adjusting knob
can be checked and the wiper interval can be
adjusted.

STEP 4. Replacement of ECU
(1)Replace the ETACS-ECU.
(2) Check that the input signal from the windshield intermittent

wiper interval adjusting knob can be checked and the wiper
interval can be adjusted.

Q: Is the input signal from the windshield intermittent

wiper interval adjusting knob input normally?
YES : There is no action to be taken.
NO : Replace the column switch. Check that the input

signal from the windshield intermittent wiper interval
adjusting knob can be checked and the wiper interval
can be adjusted.

AC003078 AB

CONNECTOR: C-60

COLUMN SWITCH

AC003082AC

JUNCTION BLOCK
(FRONT VIEW)

CONNECTOR: C-82

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-264

Inspection Procedure N-17: Transmitter: The lock, unlock, trunk or panic switch singal is not sent to
the ETACS-ECU.

CIRCUIT OPERATION
The ETACS-ECU receives an input signal from the
transmitter through its built-in receiver, and evaluates
the signal to operate various functions.

TECHNICAL DESCRIPTION (COMMENT)
The transmitter input signal is used to operate the
following systems:

•

Keyless entry system

•

Theft-alarm system <vehicles with theft-alarm
system>

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

TROUBLESHOOTING HINTS

•

Malfunction of the transmitter

•

Malfunction of the ETACS-ECU

STEP 1. Register the transmitter.
Register the transmitter (Refer to GROUP 42, Keyless Entry
System

−

On-vehicle Service

−

How To Secret Registration

Method

P.42-70

.)

Q: Is the transmitter registered successfully?

YES : The transmitter input signal should be able to be

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

NO : Go to Step 2.

STEP 2. Check the transmitter battery.
Measure the transmitter battery's voltage.

Q: Is the voltage approximately 2.5

−−−−

3.2 volts?

YES : Go to Step 3.
NO : Replace the battery. If the transmitter is registered

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

AC004205

Receiver and Transmitter Communication System

ACX01609

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-265

STEP 3. Check the transmitter.
(1)Use an other transmitter to register the secret code. (Refer

to GROUP 42, Keyless Entry System

−

On-vehicle Service

−

How To Secret Registration Method

P.42-70

.)

Q: Is the transmitter registered successfully?

YES : The transmitter input signal should be able to be

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

NO : Replace the ETACS-ECU. The transmitter input

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

Inspection Procedure O-1: Check the circuit (power supply line) from the battery to the ETACS-ECU.

CHECK THE CIRCUIT (POWER SUPPLY LINE) FROM BATTERY

•

Refer to Inspection Procedure A-1 (

P.54B-31

).

CIRCUIT OPERATION
The ETACS-ECU is always energized by the battery.

TECHNICAL DESCRIPTION (COMMENT)
If that power supply circuit is defective, the circuit
flowing through the ignition switch (IG1) will function
as a backup circuit. In this case, the following
functions will not work when the ignition switch is at
"LOCK" (OFF) position:

•

Ignition key reminder tone alarm function

•

Light reminder tone alarm function

•

Central door locking system

•

Hazard warning light

•

Dome light dimming function

•

Theft-alarm system <vehicles with theft-alarm
system>

TROUBLESHOOTING HINTS

•

Malfunction of the ETACS-ECU

•

Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:

•

MB991223: Test Harness Set

•

MB991502: Scan Tool (MUT-II)

•

MB991529: Diagnostic Trouble Code Check Harness

STEP 1. Check the battery circuit at the ETACS-ECU
connector C-86.
(1)Disconnect the ETACS-ECU connector C-86 and measure

at the junction block side.

(2)Measure the Voltage between terminal 2 and ground.

Q: Is the voltage approximately 12 volts (battery positive

voltage)?
YES : Replace the ETACS-ECU. The functions, which are

described in the "Technical Description (comment),"
should work normally.

NO : Go to Step 2.

19

20

18 17 16 15 14 13 12 11 10 9

8

7

6

5

4

3

2

1

AC002181

CONNECTOR C-86
(JUNCTION BLOCK SIDE)

AB

SWS DIAGNOSIS

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-266

STEP 2. Check ETACS-ECU connector C-86 for damage.
Q: Is ETACS-ECU connector C-86 in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. The functions, which

are described in the "Technical Description
(comment)," should work normally.

STEP 3. Check the harness wires between ETACS-ECU
connector C-86 and battery.
NOTE: After checking junction block connector C-84 and
intermediate connector C-66, check the wires. If junction block
connector C-84 and intermediate connector C-66 are
damaged, repair or replace them. Refer to GROUP 00E,
Harness Connector Inspection

P.00E-2

.

Q: Are the harness wires between ETACS-ECU connector

C-86 and battery in good condition?
YES : There is no action to be taken.
NO : Repair them. The functions, which are described in

the "Technical Description (comment)," should work
normally.

AC003080 AD

JUNCTION BLOCK
(REAR VIEW)

CONNECTOR: C-86

AC003080 AD

JUNCTION BLOCK
(REAR VIEW)

CONNECTOR: C-86

AC003079 AB

CONNECTOR
BLOCK (LH)

CONNECTOR: C-66

AC003080 AB

JUNCTION BLOCK
(REAR VIEW)

CONNECTOR: C-84