Lancer L4-2.0L SOHC (2004)
Information Bus: Description and Operation
GENERAL DESCRIPTION
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 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 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 <Vehicles without keyless entry system>
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.
SEAT BELT TONE ALARM FUNCTION <Vehicles with keyless entry system>
If any of the following conditions is met with the ignition 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.
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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)
(timer operation).
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Sounds the tone alarm 12 cycles (after 0.5 seconds) if any of the following conditions is met 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: Once the tone alarm has sounded 12 cycles, it does not sound again until the vehicle speed reduces to 3 km/h (2 mph) or less even if any
of the following conditions is met.
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.
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.
CENTRAL DOOR LOCKING SYSTEM
Central door locking system operation
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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.
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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 signal
for unlocking all doors.