Verona L6-2.5L (2005)
Information Bus: Description and Operation
Intelligent Switching Unit Description
Intelligent Switching Unit Description
ISU (Intelligent Switching Unit)
Because the conventional electric systems, in which simple timers, relays and individual control units are used, have separate circuit for each system,
they require a lot of components as well as complex wiring.
But ISU does not need such things because it integrates such complex units and wiring into a micro-controller and also controls itself intelligently.
By doing that, the number of components gets smaller and the wiring simpler, in addition, the diagnostics of electrical systems easier by using the scan
tool.
Defogger
Power source is IGN2. If you press the defogger switch ON, the rear glass and ORVM defoggers operate for 15 ± 3 min. automatically. If you press the
switch once again or turn OFF IGN 2 power while the defoggers are operating automatically, then the defoggers are turned OFF.
Central Door Locking (Default Operation)
If you press LOCK/UNLOCK buttons of the door locking switches on the driver or co-driver door, 4 doors are locked/unlocked all together.
If you lock/unlock by the key or knob of the driver door, 4 doors are locked/unlocked all together.
If you press LOCK/UNLOCK buttons of the transmitter while the ignition key is out of the ignition cylinder, 4 doors are locked/unlocked all together. In
this case, according to its condition, the anti-theft system goes into armed or disarmed mode.
The door locking actuator operates for about 0.2 sec.
Key Reminder Warning
If the driver door is opened with IGN ON and Key reminder switch ON, Internal buzzer of ISU operates.
If you remove the ignition key from the key cylinder or turn IGN ON while the buzzer is operating, Buzzer goes OFF.
Light Warning
When you open the driver door with light ON (Light switch 1 or 2 step), Buzzer operates.
If the driver door is closed or the light switch is turned OFF while the buzzer is operating, it goes
OFF.
Seat Belt Warning
When you turn the ignition ON with the driver seat belt unbuckled, (the seat belt switch ON) Buzzer operates for 6 ± 1 sec.
If you buckle up the driver seat belt (the seat belt switch OFF) or turn the ignition OFF within 6 ± 1 sec. since the buzzer operated, the buzzer goes OFF.
Because the seat belt warning lamp is not controlled by ISU but controlled directly by the seat belt switch, the lamp stays ON as long as the seat belt
unbuckled.
Turn Lamp & Hazard Lamp
Power source of the turn lamp is IGN 1 and the hazard lamp's B+.
If one of the turn lamps malfunctions, other turn lamps of that side blink two times faster than normal one. (normal: 85 Hz) But the side turn signal lamp
is not concerned.
Power Window
The power window relay is grounded by ISU when ISU receives IGN 2 power. When the power window relay is energized, the main switch of the driver
power window and the motorized ORVM
are supplied operation power to the driver power window switch of the main switch has 2 steps such as 1st step, manual UP/DOWN, and 2nd step,
automatic UP/DOWN.
The power window motor halts automatically in case that the motor current reaches 85 % of the initial starting current in auto mode UP/DOWN.
The power window motor halts automatically in case that the switch is pressed on again in auto mode UP/DOWN.
Wiper
The wiper can operate when IGN 1 power is supplied.
When the INT signal of the wiper switch is supplied to ISU, the internal relay of ISU is energized for 0.5 sec., and the wiper motor starts to move. After
0.5 sec., the motor operates just one cycle and stops at its parking position by the cam plate switch circuit of the wiper motor.
Intermittent time can be adjusted from 1.5 sec. through 12 sec. by the intermittent time adjusting switch.
If the washer switch input time is more than 0.3 sec., the internal wiper relay of ISU is energized. The wiper motor continue to work while the washer
