Eclipse V6-3.0L SOHC (2003)
Information Bus: Description and Operation
GENERAL DESCRIPTION
COMMUNICATION METHOD
As shown signal wires used exclusively for transmitting multiplex signal data connect the ETACS-ECU, front-ECU, column switch (incorporating the
column-ECU) and sunroof motor assembly (incorporating the sunroof-ECU) and these components communicate with each other.
OPERATION
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 "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 headlights are switched off through the headlight automatic shutdown function. In addition, the
ignition key reminder tone alarm function has a priority over this function.
Seat Belt Tone Alarm Function
When the ignition switch is turned to the "ON" position without fastening the seat belts (seat belt switch OFF), the tone alarm will sound for
approximately six seconds to warn the driver to fasten the seat belts. When the seat belts are fastened, the tone alarm will stop sounding.
CENTRAL DOOR LOCKING SYSTEM
Central Door Locking System Operation
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When the driver's inside lock knob is locked, the lock relay inside the ETACS-ECU turns on to lock all doors. However, even if the driver's inside
lock knob is unlocked, the all doors are not unlocked.
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With all the doors locked, turning the key in the driver's door lock key cylinder unlocks the door. Turning it again makes the door unlock relay
close to send a signal for unlocking all doors. When the key in the front passenger's door locks key cylinder is operated, the lock or unlock relay
inside the ETACS-ECU is turned on to lock or unlock all doors.
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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
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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 0.25 seconds to prevent the door from being locked.
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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
0.25 seconds.
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
