Previa Van RWD L4-148.8 2438cc 2.4L DOHC SC (2TZ-FZE) (1996)
Wiper Motor: Description and Operation
Rear Wiper and Washer
When the ignition SW is turned ON, current flows to TERMINAL 1 of the rear wiper control relay through the RR-WIPER fuse. At the same time,
current flows to TERMINAL 2 of the washer motor through FR-WASHER fuse.
1. REAR WIPER NORMAL OPERATION
With the ignition SW turned ON and rear wiper and washer SW turned ON, the current flowing to TERMINAL 1 of the rear wiper control relay
flows to TERMINAL 6 of the relay --> TERMINAL 1 of the rear wiper and washer SW --> TERMINAL 16 --> to GROUND. Thus, the relay
coil is activated and the current to TERMINAL 1 of the relay flows to TERMINAL 3 --> TERMINAL 3 of the rear wiper motor --> motor -->
TERMINAL 2 --> to GROUND and causes the motor to operate the rear wiper.
2. REAR WIPER INTERMITTENT OPERATION
With the ignition SW turned ON and the rear wiper and washer SW turned to INT position, the current flowing to TERMINAL 1 of the rear
wiper relay flows to TERMINAL 4 of the relay --> TERMINAL 10 of the rear wiper SW --> TERMINAL 16 --> to GROUND.
As a result, the relay operates for approx. 9 to 15 seconds. and current flows from TERMINAL 1 of the relay --> TERMINAL 3 -->
TERMINAL 3 of the rear wiper motor --> motor --> TERMINAL 2 --> to GROUND, causing the motor to rotate to operate the rear wiper. At
this time the contact in the wiper motor closes and the current flows from TERMINAL 1 of the rear wiper motor --> TERMINAL 4 -->
TERMINAL 2 of the rear wiper relay --> TERMINAL 3 --> TERMINAL 3 of the rear wiper motor --> TERMINAL 2 --> to GROUND.
Thus, the intermittent-stop circuit operates, the condenser in the circuit charges and the wiper continues to operate until reaching the STOP
position. After the wiper stops, current does not flow to the intermittent-stop circuit from TERMINAL 2 of the relay, but the condenser discharges
current into the intermittent circuit and the circuit operates until the condenser discharge ends. As a result, this discharge interval becomes the
intermittent time.
When the current is discharged completely, the current flowing to TERMINAL 1 of the relay flows to TERMINAL 4 --> TERMINAL 10 of the
rear wiper and washer SW --> TERMINAL 16 --> to GROUND.
Then, the current in TERMINAL 1 of relay flows from TERMINAL 3 --> TERMINAL 3 of the motor --> motor --> TERMINAL 2 --> to
GROUND, and rotates the motor. Through repetition of this process, intermittent operation of the rear wiper occurs.