System Description

FRONT WIPER AND WASHER SYSTEM : System Description


OUTLINE
For improving front visibility in rainy weather, front wiper motor and front wiper drive are controlled according to LO or HI operation of front wiper. Wiping angle is enlarged.
The front wiper is controlled by each function of BCM and IPDM E/R.

Control by BCM
- Combination switch reading function
- Front wiper control function

Control by IPDM E/R
- Front wiper control function
- Relay control function
Combination meter indicates low washer fluid warning judged by the signal from the washer level switch. For details of low washer fluid warning, System Description.

FRONT WIPER BASIC OPERATION
- BCM detects the combination switch condition by the combination switch reading function.
- BCM transmits the front wiper request signal to IPDM E/R via CAN communication depending on each operating condition of the front wiper.
- Front wiper motor transmits the front wiper position signal to IPDM E/R.
- IPDM E/R operates ON/OFF of front wiper main relay, front wiper HI/LO relay, and wiper reverse relay according to front wiper request signal and front wiper position signal. Rotation direction, ON/OFF of wiper motor, and HI/LO operation of front wiper are controlled by IPDM E/R.

FRONT WIPER LO OPERATION
- BCM transmits the front wiper request signal (LO) to IPDM E/R via CAN communication according to the front wiper LO operating condition.

Front wiper LO operating condition
- Ignition switch ON
- Front wiper switch LO or front wiper switch MIST (while pressing)
- When detecting that front wiper request signal changes from OFF to LO, IPDM E/R turns front wiper main relay ON. Power supply is supplied to LO terminal of front wiper motor. Being connected to ground by wiper reverse relay, front wiper motor operates clockwise at LO.
- When detecting that front wiper request signal changes from HI to LO, IPDM E/R performs HI operation
(front wiper motor rotation is counter clockwise) until detecting that front wiper position signal from front wiper motor is in near range of the upper or lower reversal position. When detecting the upper or lower reversal position, IPDM E/R turns front wiper main relay ON, front wiper HI/LO relay OFF, and wiper reverse relay OFF. Front wiper motor operates clockwise at LO.

FRONT WIPER HI OPERATION
- BCM transmits the front wiper request signal (HI) to IPDM E/R via CAN communication according to the front wiper HI operating condition.

Front wiper HI operating condition
- Ignition switch ON
- Front wiper switch HI
- When detecting that front wiper request signal changes from OFF to HI or from LO to HI, IPDM E/R performs
LO operation (front wiper motor rotation is clockwise) until detecting front wiper position signal from front wiper motor is in near range of the upper or lower reversal position. When detecting the upper or lower reversal position, IPDM E/R turns front wiper main relay OFF, front wiper HI/LO relay ON, and wiper reverse relay ON. Front wiper motor operates counterclockwise at HI.

FRONT WIPER AUTO OPERATION

Rain Detection
Rain level and sensor conditions are detected by rain sensor.
- BCM transmits the vehicle condition signal (vehicle speed, front wiper condition, rain sensor sensitivity setting, etc.) to the rain sensor via the rain sensor serial link.
- Rain sensor judges a wiping speed for front wiper by rain condition and the vehicle conditions. And it transmits the front wiper request signal to the BCM via the rain sensor serial link.

Auto Wiping Operation
- BCM receives the wiping speed request signal from the rain sensor via the rain sensor serial link.
- BCM controls front wiper operation according to the front wiper request signal. And it transmits the front wiper request signals (LO or HI) to the IPDM E/R via CAN communication line.

Front wiper AUTO operating condition
- Ignition switch ON
- Front wiper switch AUTO

NOTE:
When the front wiper switch is turned to AUTO position, front wiper operates once regardless of rainy conditions.

Rain Sensor Sensitivity Setting
BCM determines rain sensor sensitivity according to wiper volume dial position.






NOTE:
When the wiper volume dial position is turned up by 1 level under front wiper AUTO operating condition, front wiper operates once.

Splash Mode Operation
Front wiper is operated at HI regardless of the wiper volume adjustment position, when water drops are instantaneously sprayed over the windshield glass due to water splash from oncoming vehicles or other causes.
After that, AUTO operation is performed depending on the amount of water drops.

Splash mode operation conditions
- Front wiper switch AUTO
- Ignition switch ON

NOTE:
Splash mode is not operated and auto wiping operation is performed, while the vehicle is stopped.

FRONT WIPER AUTO STOP OPERATION
- BCM stops transmitting the front wiper request signal when the front wiper switch is turned OFF.
- IPDM E/R detects the front wiper position signal from the front wiper motor and detects the front wiper motor position (stop position/except stop position).
- When the front wiper request signal is stopped, IPDM E/R turns ON the front wiper main relay until the front wiper motor returns to the stop position.






NOTE:
- BCM stops the transmitting of the front wiper request signal when the ignition switch is OFF.
- IPDM E/R turns the front wiper main relay OFF when the ignition switch is OFF.

FRONT WIPER OPERATION LINKED WITH WASHER
- BCM transmits the front wiper request signal (LO) to IPDM E/R via CAN communication according to the washer linked operating condition of the front wiper.
- BCM transmits the front wiper request signal (LO) so that the front wiper operates approximately 2 times when the front washer switch OFF is detected.

Washer linked operating condition of front wiper
- Ignition switch ON
- Front washer switch ON (0.4 second or more)
- IPDM E/R turns ON the integrated front wiper main relay according to the front wiper request signal (LO).
- The washer pump is grounded through the combination switch with the front washer switch ON.

FRONT WIPER DROP WIPE OPERATION
- BCM controls the front wiper to operate once according to the conditions of front wiper drop wipe operation.

Front wiper drop wipe operating condition
- Ignition switch ON
- Front wiper switch OFF
- Front washer switch OFF
- BCM transmits the front wiper request signal (LO) to IPDM E/R with CAN communication so that the front wiper operate once three seconds after front wiper operation linked with washer.
- IPDM E/R turns ON the integrated front wiper main relay according to the front wiper request signal (LO).

FRONT WIPER SERVICE POSITION OPERATION
- When front wiper switch MIST is operated 2 times, front wiper operates at LO and stops so that front wiper can be locked back.

Front wiper service position operation conditions
- Ignition switch ON.
- Front wiper switch OFF.
- Shift position N or P
- Vehicle speed is 4 km/h or less
- Front wiper operates at LO and stops, when IPDM E/R detects that front wiper request signal from BCM via
CAN communication changes from LO to OFF 2 times while the stop position of front wiper position signal is detected (last detection is OFF).

WIPER LINKED AUTO LIGHTING FUNCTION
When light switch is in the AUTO position, front wiper operates, and then headlamp illuminates. System Description.