As shown below, signal wires used exclusively for
transmitting multiplex signal data connect the
ETACS-ECU, front-ECU, column switch (incorporat-
ing the column-ECU), sunroof motor assembly
(incorporating the sunroof-ECU), RV meter and
these components communicate with each other.

OPERATION

M1549013100458

TONE ALARM FUNCTION

Ignition key reminder tone alarm function
When the driver's door is opened (driver's door
switch ON) without removing the ignition key [ignition
switch to the "LOCK" (OFF) or "ACC" position], the
tone alarm will sound intermittently to remind the
driver that the ignition key has not been removed.

Light reminder tone alarm function
When the driver's door is opened (driver's door
switch ON) with lighting switch (taillight switch or
headlight switch) in the ON position and ignition
switch in the "LOCK" (OFF) or "ACC" position, the
tone alarm will sound continuously to remind the
driver that the lights (taillights or headlights) are ON.
This function does not work if the taillights or head-
lights are switched off through the headlight auto-
matic shutdown function. In addition, the ignition key
reminder tone alarm function has a priority over this
function.

Seat belt tone alarm function
If any of the following conditions is met with the igni-
tion switch at "ON" or "ST", the ETACS-ECU sounds
the tone alarm by using the driver's seat belt switch
signal.

• The ETACS-ECU sounds the tone alarm for six

seconds if the ignition switch is turned "ON" while
the seat belt switch is on (the driver's seat belt is
not fastened).

• The ETACS-ECU sounds the tone alarm 12

cycles (after 0.5 seconds) if the seat belt switch is
on (driver's seat belt is not fastened) when sixty
seconds or more have elapsed since the ignition
switch is turned "ON". One cycle consists of
five-second "on" and then three-second "off".

NOTE: The ETACS-ECU stops sounding immedi-
ately when the seat belt witch is off (driver's seat belt
is fastened) or the ignition switch is turned to the
"OFF" or "ACC" position while the seat belt tone
alarm function is working.

RV meter tone alarm function
When tone alarm sounding is requested from the RV
meter, the ETACS-ECU activates the built-in tone
alarm. The RV meter will "beep" when adjusting the
brightness level, only with the ignition key in the
"ACC" position.

AC203687

SCAN TOOL MB991502

SWS MONITOR KIT

MB991862

FRONT-ECU

ETACS-ECU

SUNROOF MOTOR
ASSEMBLY*¹
(SUNROOF-ECU)

COLUMN SWITCH
(COLUMN-ECU)

NOTE
*¹: Vehicles with sunroof
*²: Vehicles with RV meter

RV METER*²

GENERAL DESCRIPTION

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-3

CENTRAL DOOR LOCKING SYSTEM

Central door locking system operation

• When the driver's inside lock knob is locked or

unlocked, the lock relay inside the ETACS-ECU
turns on to lock or unlock all doors.

• With all the doors locked, turning the key in the

driver's door unlocks the door. Turning it again
makes the door unlock relay close to send a sig-
nal for unlocking all doors.

• When the door lock switch (built into the power

window switch) is operated, the lock or unlock
relay inside the ETACS-ECU is turned on to lock
or unlock all doors.

Forgotten key prevention function

• If the driver's door is open (door switch turned

ON), when the key is inserted in the ignition
switch (key reminder switch turned OFF), the
ETACS-ECU activates the door unlock relay for
0.5 second to prevent the door from being locked.

• If you try to lock either the driver's or passenger's

door when the passenger's door is open (door
switch turned ON) and the key is inserted in the
ignition switch (key reminder switch turned OFF),
the ETACS-ECU prevents the doors from being
locked by activating the door unlock relay for 0.5
second.

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 the "ON"
position to "LOCK" (OFF) or "ACC" position, the
power windows can be operated for 30 seconds. If
any door is opened for the 30 seconds, the power
windows will be immobilized at that point.

KEYLESS ENTRY SYSTEM

If the RKE 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 15 seconds. The hazard and the horn
answerback functions can be cancelled by using the
RKE transmitter.

SUNROOF

Sunroof operation

• All of the slide open/close, tilt up/down, and stop

operations can be performed by a single switch.

• When the roof lid glass is tilted up, the sunshade

opens approximately 98 mm (3.9 inches) in com-
bined operation with the roof lid glass for better
ventilation.

• A jam preventing mechanism has been adopted.

When a slide-close or tilt-down operation is
blocked by an external force, the roof lid glass
moves back and stops.

• The electronic sunroof system cannot be oper-

ated manually. The sunroof wrench that was used
in previous models is not provided. If the anti-jam
mechanism reverses the sunroof five or more
times consecutively due to deformation or other
problem with the sunroof components, it deacti-
vates and allows the sunroof to make small
movements [30 mm (1.2 inches)] until it closes
completely.

Sunroof timer function
When the ignition switch is turned from "ON" position
to "LOCK" (OFF) or "ACC" position, the sunroof can
be operated for thirty seconds. If any door is opened
for the 30 seconds, the sunroof will be immobilized at
that point.

WINDSHIELD WIPERS AND WASHERS

Windshield low-speed (and high-speed) wiper
operation

• If the windshield low-speed wiper switch is turned

to the 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 sig-
nal on and the wiper speed control relay off
(low-speed), causing the wipers to operate at
low-speed.

• If the windshield high-speed wiper switch is

turned to the 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 control
relay on (high-speed), causing the wipers to
operate at high-speed.

GENERAL DESCRIPTION

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-4

NOTE: The windshield wiper speed is changed by
wiper speed control relay incorporated in front-ECU.
When the wiper speed control relay is at "ON" posi-
tion, the windshield wiper operates at high-speed,
and the wiper speed control relay is at "OFF" posi-
tion, the windshield wiper operates at low-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 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 the

ON position with the ignition switch at the "ACC"
or "ON" position, the mist wiper high-speed oper-
ation signal is sent to the front-ECU. This signal
turns on the wiper speed control 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 work-
ing, the wipers work as the mist wiper. However,
the wipers return to the intermittent mode again
when the switch is changed back to "INT" posi-
tion.

• To prevent the windshield mist wiper from operat-

ing when the windshield wiper switch is turned
OFF, the windshield mist wiper does not work for
0.5 second after the windshield intermittent wiper
switch, the windshield low-speed wiper switch
and the windshield high-speed wiper switch are
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. After 0.3 seconds, the wind-
shield wiper signal to turn on. 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,
when the windshield washer switch is turned OFF
within 0.2 second, the wiper works only once to
perform mist operation by the windshield washer
switch. When the ON condition of the windshield
washer switch continues more than 0.2 second,
the wiper performs the same movement as nor-
mal condition from the time when 0.2 second has
elapsed and then returns to the intermittent
motion.

REAR WIPER AND WASHER

Rear wiper operation
If the rear wiper and washer switch is turned to "INT"
position with the ignition switch at "ACC" or "ON"
position, the ETACS-ECU turns ON the rear wiper
drive signal for three seconds (approximately two
cycles), then 7.4 seconds later the intermittent
motion operates every eight seconds. If the selector
lever is moved to the "R" position when the rear
wiper and washer switch is turned to the "INT" posi-
tion and the ignition switch is at the "ACC" or "ON"
position, the transmission range switch "R" turns ON.
One second later, the ETACS-ECU turns ON the rear
wiper drive signal for three seconds (approximately
two cycles). Then, 7.4 seconds later, the intermittent
motion of eight seconds' cycle is restored.

Rear washer operation
If the rear wiper and washer switch is turned to the
ON (washer) position with the ignition switch at the
"ACC" or "ON" position, the rear washer ON signal is
sent to the ETACS-ECU, causing the rear wiper sig-
nal to turn on after 0.3 seconds. After the rear
washer switch signal turns off, the rear wiper signal
turns off in three seconds. If the rear washer switch is
turned to the ON position while the rear wiper is in
intermittent mode, the rear washer works for that
period when the washer switch remains on. Then the
rear wipers return to the intermittent mode.

HEADLIGHT WASHER

If the washer switch on the steering column is placed
in the ON position when the ignition switch is in the
"ACC" or "ON" position and the headlight switch is in
the ON position, the headlight washer drive signal is
turned ON for 0.5 second.

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