Mitsubishi Galant. Manual — part 652

GENERAL DESCRIPTION

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-3

POWER WINDOW RELAY CONTROL

Power Window Relay Operation
If the ignition switch is turned to "ON" position, the
power window relay is energized to activate the
power windows.

Power Window Timer Function
When the ignition switch is turned from "ON" position
to "LOCK" (OFF) or "ACC" position, the power
windows will be ready to work for 30 seconds, the
power windows will be immobilized at that point.

KEYLESS ENTRY SYSTEM

Keyless Entry Answerback Function
If the transmitter "LOCK" or "UNLOCK" switch is
pressed while the ignition key is removed, the doors
can be locked or unlocked. If the doors are closed,
the hazard warning lights, the dome light and the
horn will operate due to answerback function.
Because of the answerback function, the hazard
warning lights flash twice, and the horn sounds once,
the dome light flashes twice when the doors are
locked. Meanwhile, when the doors are unlocked,
the hazard warning lights flash and the dome light
illuminates for 30 seconds. The hazard and the horn
answerback functions can be cancelled by using the
transmitter.

WINDSHIELD WIPERS AND WASHERS

Windshield Low-speed (and High-speed) Wiper
Operation

•

If the windshield low-speed wiper switch is turned
to ON position with the ignition switch at the
"ACC" or "ON" position, the column switch sends
a low-speed wiper ON and high-speed wiper OFF
signals to the front-ECU. This turns the wiper
signal on and the wiper speed switching relay off
(low-speed), causing the wipers to operate at
low-speed.

•

If the windshield high-speed wiper switch is
turned to ON position, the column switch sends a
low-speed wiper OFF and high-speed wiper ON
signals to the front-ECU. This turns both the
wiper signal and the wiper speed switching relay
on (high-speed), causing the wipers to operate at
high-speed.

Windshield Intermittent Wiper Operation
The ETACS-ECU calculates the wiper operation
interval according to the voltage signal sent from the
column switch. Then the ETACS-ECU sends a signal
to the front-ECU. The front-ECU determines the
wiper operation interval and turns on the wiper relay
signal relay. This causes the wiper auto stop relay to

turn on. Then the wiper auto stop relay to turn on.
Then the wiper auto stop relay will turn off after the
wipers reach the park position. This causes the wiper
signal relay and then the wipers to turn off. If the
wiper signal relay remains off for the wiper operation
interval, the relay turns on again, causing the wipers
to operate in intermittent mode.

Windshield Mist Wiper Operation

•

If the windshield mist wiper switch is turned to ON
position with the ignition switch at "ACC" or "ON"
position, the mist wiper high-speed operation
signal is sent to the front-ECU. This signal turns
on the wiper speed switching relay, causing the
wipers to work at high-speed while the mist
switch is on.

•

While the windshield mist wiper switch remains
turned on when the intermittent mode is still
working, the wipers work as the mist wiper.
However, the wipers return to the intermittent
mode again when the wiper auto stop signal turn
on after the windshield mist wiper switch is turned
off.

Windshield Washer Operation

•

If the windshield washer switch is turned to ON
position with the ignition switch at "ACC" or "ON"
position, the windshield washer ON signal is sent
to the front-ECU, causing the windshield wiper
signal to turn on after 0.6 seconds. After the
windshield washer switch signal turns off, the
windshield wiper signal turns off in three seconds.

•

If the windshield washer switch is turned on while
the windshield wiper is at intermittent mode, the
windshield washer works for that period when the
windshield washer switch remains on. Then the
wipers return to the intermittent mode.

SEAT BELT WARNING LIGHT

If the driver turns the ignition switch to the "ON"
position without wearing the seat belt, the seat belt
warning light illuminates to alert the driver to wear
the seat belt.

IGNITION KEY HOLE ILLUMINATION
LIGHT

When the ignition switch is turned to "LOCK" (OFF)
or "ACC" position with the driver's door opened, the
ignition key hole illumination light is illuminated. If the
door is closed in that state, the light goes out after 30
seconds or it illuminates for 30 seconds after the
ignition key is removed. In either case the light goes
out when the ignition switch is turned to the "ON"
position.

GENERAL DESCRIPTION

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-4

HEADLIGHT

Headlight Automatic Shutdown Function
If ignition switch is turned to "LOCK" (OFF) or "ACC"
position or the taillights are on, the headlights will be
switched off in 3 minutes. If the driver's door is
opened within that 3 minute period, the headlights
will be switched off automatically. This prevents the
battery from discharging. In addition, if the headlights
or the taillights are turned on when the ignition switch
is at "LOCK" (OFF) or "ACC" position or the ignition
key is removed, the headlights will not be switched
off.

Headlight Dimmer Switch Automatic Resetting
Function
This function allows the dimmer switch to be reset to
the low-beam position whenever the headlight switch
is turned to ON position.

FLASHER TIMER

Turn-signal Light
When the ignition switch is turned to "ON" position
and turn-signal light switch is placed in the ON
position for right or left turn-signaling, the system
generates turn-signal light drive signals (flashing
signals). The system also notifies of a blown turn-
signal light bulb by shortening the flashing intervals
of the corresponding indicator light.

Hazard Warning Light
The system detects a change from OFF to ON of the
hazard warning input signal and activates the hazard
warning lights if they are not in operation or
deactivates the lights if they are operating (reversal
of state between activation and deactivation).

FOG LIGHT

The fog light switch becomes active only when the
headlights are at the low-beam mode. Therefore, if
the headlights are turned off, the fog lights will also
be switched off. Whenever the headlights are turned
on at the next time, the fog light will always be off
regardless of the switch position.

DOME LIGHT

With the dome light switch in the "door controlled
operation" position, the ETACS-ECU controls the
dome light operation as follows:

•

When a door is opened from outside or inside
[with the ignition switch turned to "LOCK" (OFF)]:
When a door is opened, the ETACS-ECU causes
the dome light to be illuminated at the 100%
intensity. When the door is closed, it dims out the
dome light to 65% intensity and approximately 30
seconds later, turns out the light completely.
During this period (timer controlled period), the
dome light goes out if the ignition switch is turned
"ON" or the doors are locked.

•

When a door is opened or closed with the ignition
switch in the "ON" position: The dome light
illuminates at 100% intensity when a door is
opened and turned out when it is closed.

•

When no door is opened and the ignition key is
removed: When the ignition key is removed with
all the doors closed, the dome light is illuminated
at 100% intensity and turned out approximately
30 seconds later. During that time (timer-
controlled period), the dome light goes out if the
ignition key is inserted and turned to "ON" or the
door locking system is activated.

•

Dome light's answerback operation in response
to door lock control by keyless entry system: To
allow the driver to ascertain the result of the door
locking/unlocking control action by the use of the
keyless entry system, the ETACS-ECU causes
the dome light to blink twice when the doors are
locked through the system and to illuminate for
approximately 15 seconds when the doors are
locked. The dome light's answerback operation in
response to a keyless entry system control action
is accompanied by operation of the hazard
warning lights.

THEFT-ALARM SYSTEM

Theft-alarm System Operation
When the theft-alarm system has been armed if a
door, trunk lid or hood is opened, the horn will sound
and headlights flash (high-beam) intermittently for a
period of 180 seconds.

Panic Alarm Function
With the theft-alarm function armed, pressing the
panic button on the keyless entry system transmitter
causes the theft-alarm horn to sound for about 180
seconds in an attempt to prevent theft. The alarm is
turned off by pressing any switch on the transmitter.

SWS DIAGNOSIS

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SW S DIA G NO SIS

INTRODUCTION TO SWS DIAGNOSIS

M1549001900071

The SWS reduces the number of wires by sending
multiple signals along a single wire. This reduces
vehicle weight and simplifies construction by
reducing wiring harness complexity weight. The
ETACS-ECU, front-ECU and column switch
(incorporated in column-ECU) have multiplex signal
circuits that enable them to transmit and/or receive
multiple signals and communicate with other control
unit.

SWS DIAGNOSTIC TROUBLESHOOTING STRATEGY

M1549000500081

Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted most of the possible ways to find a
SWS fault.
1. Gather information about the problem from the

customer.

2. Verify that the condition described by the

customer exists.

3. Check the vehicle for any SWS DTC.

4. If you cannot verify the condition and there are no

SWS DTCs, the malfunction is intermittent. Refer
to GROUP 00, How to Use Troubleshooting/
inspection Service Points

−

How to Cope with

Intermittent Malfunctions

P.00E-5

.

5. If you can verify the condition but there are no

SWS DTCs, or the system cannot communicate
with the scan tool, refer to Symptom Chart.

6. If there is a SWS DTC, perform the diagnostic

procedures for the DTC. Refer to Diagnostic
Trouble Chart.

SWS TROUBLE CODE DIAGNOSIS

M1549000600077

Retrieving SWS Diagnostic Trouble Codes

Required Special Tool:

•

MB991502: Scan Tool (MUT-II)

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
1. Connect scan tool MB991502 to the data link connector.

2. Use scan tool MB991502 to check for SWS diagnostic

trouble codes.

3. Turn the ignition switch to "LOCK" (OFF) position.

4. Disconnect scan tool MB991502.

Input Signal Check Function

This mode checks the switch input signals to each ECU
incorporated in the SWS. If a defect is found at this check, carry
out the troubleshooting by referring to Symptom Chart.

AC003081 AB

16 PIN

MB991502

SWS DIAGNOSIS

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-6

<When using scan tool MB991502>

Required Special Tool:

•

MB991502: Scan Tool (MUT-II)

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
1. Connect scan tool MB991502 to the data link connector.

2. If input signal is sent to the data link connector, tone alarm of

scan tool MB991502 will sound.

3. Turn the ignition switch to "LOCK" (OFF) position.

4. Disconnect scan tool MB991502.

<When using a voltmeter>

Required Special Tool

•

MB991529: Diagnostic Trouble Code Check Harness

1. Connect special tool MB991529 to connect a voltmeter

between grounded terminal 4 or 5 and ETACS-ECU terminal
9 of the 16 pin data link connector.

2. If input signal is sent to the data link connector, the voltmeter

needle will fluctuate once.

3. Disconnect special tool MB991529.

Requirements for which switches send input signals

AC003081 AB

16 PIN

MB991502

AC003083

16 PIN

AB

ETACS-ECU
TERMINAL

GROUNDED TERMINAL

MB991529

SWITCHES WHICH SEND INPUT SIGNAL

REQUIREMENTS FOR SWITCHES SEND
INPUT SIGNAL

Ignition switch (ACC)Turn from "LOCK" (OFF)

to "ACC"

Ignition switch (IG1)Turn from "ACC" to "ON"

Key reminder switch

Remove the ignition key from ignition key
cylinder (from inserted position)

Hazard warning light switch

Turn from OFF to ON

Fog light switch

Driver's seat belt switch

Remove the seat belt tongue from the seat belt
buckle with the ignition key "ON" position

Driver's or passenger's door switch

Open the door

Door switches

Open any door when all doors are closed

Driver's or front passenger's door lock key cylinder switch Turn the key to the lock or unlock position

Driver's or front passenger's door lock actuator switch

Move the door lock knob from lock position to
unlock position or vice versa

Rear door lock actuator switch <Vehicles with theft-alarm
system>