ECU FUNCTIONS AND CONTROLS IN THE SWS
SIMPLIFIED WIRING SYSTEM (SWS)
54B-19
Mist wiper control
When the ignition switch is in the ACC or ON posi-
tion, and the windshield mist wiper switch of the col-
umn switch is turned ON, the front-ECU turns ON the
windshield wiper drive signal. At the same time, the
wiper speed switching relay is turned ON
(HIGH-SPEED). While the windshield mist wiper
switch is ON, the windshield wiper will operate at
high speed. Then, if the windshield mist wiper switch
is turned off, the wiper operates at low speed until it
stops at the predetermined park position.
When the windshield mist switch is turned on briefly,
the wiper operates once at low speed.
At the point the windshield mist switch is turned ON,
if the windshield wiper has been operating intermit-
tently, the same operations as the above will be per-
formed while the windshield mist wiper switch is ON.
After the windshield mist wiper switch goes OFF, the
intermittent operations will be set again T1 seconds
after the last windshield wiper auto-stop signal turn-
ing ON.
.
Low speed wiper, high speed wiper control
When the ignition switch in at the ACC or ON posi-
tion, and the windshield low speed wiper switch of
the column switch is turned ON, the front-ECU turns
ON the windshield wiper drive signal, turns OFF (LO)
the windshield wiper speed relay, and operates the
windshield wiper at low speed. Next, when the wind-
shield high speed wiper switch is turned ON, the
windshield wiper drive signal is turned ON, the wind-
shield wiper speed switching relay is turned ON (HI),
and the windshield wiper is operated at high speed.
.
AC200047AB
ON
OFF
ON
OFF
ON
OFF
ON (HIGH)
Windshield mist wiper switch
Windshield wiper auto-stop
signal
Windshield wiper drive signal
Windshield wiper speed
switching relay
OFF (LOW)
When windshield
wiper switch is OFF
When windshield intermittent
wiper is operating
T1: Intermittent time
T1
T1
AC005437AF
ON
OFF
ON
OFF
ON
OFF
ON (HIGH)
Windshield low-speed
wiper switch
Windshield high-speed
wiper switch
Windshield wiper auto-stop
signal
ON
OFF
Windshield wiper
drive signal
Windshield wiper
speed switching relay OFF (LOW)
Low speed operations
High speed operations