the powertrain control module, the A/C-ECU, the
SRS-ECU, the combination meter, the ABS-ECU,
and the middle-grade multi center display. These two
communications groups are connected to form a
dedicated network for sending multiplex data.

NOTE: *

ETACS: Electronic Time and Alarm Control

System
NOTE: *

CAN: Controller Area Network

NOTE: *

: For details on CAN, see Group 54C.

OPERATION

M1549013100566

TONE ALARM FUNCTION

IGNITION KEY REMINDER TONE ALARM
FUNCTION

When the driver’s door is opened with the ignition
key inserted in the ignition key cylinder (ignition
switch is in the OFF position,) the tone alarm sounds
intermittently to indicate that the ignition key has not
been removed.

LIGHT REMINDER TONE ALARM
FUNCTION

When the taillights or headlights are ON, if the igni-
tion key is removed and the driver's door is opened,
a tone alarm will sound continuously to warn that the
light is illuminated. However, if the taillights or head-
lights have been turned off by the headlight auto-
matic-shutdown function, the tone alarm will not
sound.

AC306603

ETACS-ECU

FRONT-ECU

COLUMN SWITCH
(COLUMN-ECU)

SUNROOF-ECU

SWS

CAN

A/C-ECU

POWERTRAIN CONTROL
MODULE

COMBINATION METER

MULTI CENTER
DISPLAY UNIT
(MIDDLE GRADE TYPE)

Single-direction communication

Bidirectional communication

ABS-ECU

SRS-ECU

GENERAL DESCRIPTION

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-3

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 and the vehicle speed signal sent from the
combination meter.

• Sounds the tone alarm for six seconds when the

ignition switch is turned "ON" with the seat belt
switch on (the driver's seat belt is not fastened).
This is called "Timer function".

• Sounds the tone alarm 12 cycles (after 0.5 sec-

onds) if any of the following conditions is met
when sixty seconds or more have elapsed since
the ignition switch is turned "ON". One cycle con-
sists of five-seconds "on" and then three-seconds
"off".

a. The vehicle speed has reached 8 km/h (5

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

b. The seat belt switch has been turned on

(driver's seat belt has not been fastened) for
at least ten seconds while the ignition switch
has been turned "ON" and the vehicle speed
has been 8 km/h (5 mph) or more.

NOTE: Once the tone alarm has sounded 12

cycles, it does not sound again until the vehi-
cle speed reduces to 3 km/h (2 mph) or less
even if any of the following conditions is met.

• The tone alarm stops sounding if the ignition

switch or the seat belt switch is turned off (the
driver's seat belt is fastened) while the timer
operation is active.

DOOR AJAR WARNING BUZZER

The buzzer is sounded 4 times by the ETACS-ECU
to warn the driver if any door is open when the igni-
tion is switched ON and the vehicle speed reaches 8
km/h (5 mph) or faster. The buzzer will continue to
sound for 4 times even if the ignition, door status, or
vehicle speed requirements are not maintained.

MULTI CENTER DISPLAY OPERATION
TONE <VEHICLES WITH MULTI CENTER
DISPLAY (MIDDLE GRADE TYPE)>

The ETACS-ECU sounds the buzzer when the
buzzer signal is sent from the multi center display.

TURN-SIGNAL LIGHT BUZZER

The ETACS-ECU sounds the buzzer in sync with the
turn-signal lights or hazard warning lights.

CENTRAL DOOR LOCKING SYSTEM

CENTRAL DOOR LOCKING SYSTEM
OPERATION

Door unlocking by operating the driver’s door lock
key cylinder:

• When the ignition key is inserted in the driver’s

door lock key cylinder and turned clockwise to
unlock the driver’s door, the ETACS-ECU oper-
ates its door unlock relay and passes a current
through the door lock actuator of the driver’s door
for 0.25 seconds to unlock only the driver’s door.

• When the ignition key is turned clockwise again,

the ETACS-ECU operates its door unlock relay
and passes a current through the door lock actu-
ators of all doors for 0.25 seconds and to unlock
all doors.

Door locking or unlocking by operating the driver ’s or
front passenger ’s door lock switch:

• When the door is locked by the driver’s or front

passenger ’s door lock switch, the ETACS-ECU
operates its door lock relay and passes a current
through the door lock actuators of all doors for
0.25 seconds to lock all doors.

• When the door is unlocked by the driver’s or front

passenger's door lock switch, the ETACS-ECU
operates its door unlock relay and passes a cur-
rent through the door lock actuators of all doors
for 0.25 seconds to unlock all doors.

• When the door is locked and unlocked by driver’s

or front passenger's door lock switch consecu-
tively, the ETACS-ECU operates its door lock
relay and passes a current through the door lock
actuators of all doors for 0.25 seconds to lock all
doors. Then, the ETACS-ECU operates its door
unlock relay and passes a current through the
door lock actuators of all doors for 0.25 seconds
to unlock all doors. Due to this, there may be a
time lag between the driver’s or front passenger's
door lock switch actuation and the time when all
doors are unlocked.

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