System Description

SYSTEM DIAGRAM

Component		Function
Front wiper motor		Refer to Front Wiper Motor.
IPDM E/R		Controls integrated relays according to the request (via CAN communication) from BCM.
BCM		Judges each switch status by the combination switch reading function. Requests (via CAN communication) the front wiper relay and the front wiper HI/LO relay ON to IPDM E/R.
Combination switch (wiper & washer switch)		Combination switch: Transmits the status of the combination switch (wiper and washer) to BCM.
ABS actuator and electric unit (control unit)		Transmits vehicle speed signal to BCM via CAN communication.
Washer pump		Refer to Front And Rear Washer Pump.
Front washer pump relay		Controls washer pump according to the request from IPDM E/R.
Light & rain sensor^*		Refer to Light and rain sensor.

^*: With light & rain sensor

OUTLINE

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

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.
IPDM E/R turns ON/OFF the integrated front wiper relay and the front wiper HI/LO relay according to the front wiper request signal. IPDM E/R provides the power supply to operate the front wiper High/Low operation.

FRONT WIPER LOW OPERATION

BCM transmits the front wiper request signal (LOW) to IPDM E/R via CAN communication according to the front wiper low operating condition.
Front wiper low operating condition
- Electric motor switch ON
- Front wiper switch LO or front wiper switch MIST (while pressing)
IPDM E/R turns ON the integrated front wiper relay according to the front wiper request signal (LOW).

FRONT WIPER HIGH OPERATION

BCM transmits the front wiper request signal (HIGH) to IPDM E/R via CAN communication according to the front wiper high operating condition.
Front wiper high operating condition
- Electric motor switch ON
- Front wiper switch HI
IPDM E/R turns ON the integrated front wiper relay and the front wiper HI/LO relay according to the front wiper request signal (HIGH).

FRONT WIPER INTERMITTENT OPERATION <WITHOUT LIGHT & RAIN SENSOR>

BCM transmits the front wiper request signal (LOW) to IPDM E/R via CAN communication depending on the front wiper intermittent operating condition and intermittent operation delay interval according to the wiper volume dial position.
Front wiper intermittent operating condition
- Electric motor switch ON
- Front wiper switch INT
IPDM E/R turns ON the integrated front wiper relay so that the front wiper is operated only once according to the front wiper request signal (LOW) and front wiper request signal (RETURN).
BCM detects stop position/except stop position of the front wiper motor according to the front wiper stop position signal received from IPDM E/R via CAN communication.
BCM transmits the front wiper request signal (LOW) again after the intermittent operation delay interval.

note	The front wiper intermittent operation setting of the linked or not linked with vehicle speed can be changed by combination meter setting.

Front wiper intermittent operation with vehicle speed

BCM calculates the intermittent operation delay interval from the following
- Vehicle speed signal
- Wiper volume dial position

Intermittent operation delay Interval

Unit: Second

Intermittent operation interval	Vehicle speed
	Accelerating		0 – 30 km/h (0 – 18.6 MPH)	31 – 60 km/h (18.7 – 37.3 MPH)	61 – 105 km/h (37.4 – 65.2 MPH)	106 km/h (65.3 MPH) or more
	Decelerating		0 – 25 km/h (0 – 16.5 MPH)	26 – 55 km/h (16.6 – 34.2 MPH)	56 – 100 km/h (34.3 – 62.1 MPH)	101 km/h (62.2 MPH) or more
Long ↑ ↓ Short	Wiper volume dial position	1	21.0*	18.9	15.8	12.6
		2	11.2*	10.1	8.4	6.7
		3	5.6*	5.0	4.2	3.4
		4	2.8*	2.5	2.1	1.7
		5	1.4*	1.3	1.1	0.8

*: When operation setting is not linked with vehicle speed.

FRONT WIPER AUTO OPERATION <WITH LIGHT & RAIN SENSOR>

Rain Detection

Rain level and sensor conditions are detected by light & rain sensor.

BCM transmits the vehicle conditions (vehicle speed, front wiper condition, light & rain sensor sensitivity setting, etc.) to the light & rain sensor via the LIN communication line.
Light & rain sensor judges a wiping speed for front wiper by rain condition and the vehicle conditions. And it transmits the wiping speed request signal to the BCM via the light & rain sensor LIN communication line.

Auto Wiping Operation

BCM receives the wiping speed request signal from the light & rain sensor via the LIN communication line.
BCM controls front wiper operation according to the wiping speed request signal. And it transmits the front wiper request signal (LOW or HIGH) to the IPDM E/R via CAN communication line.
Front wiper AUTO operating condition
- Electric motor 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.

Light & rain Sensor Sensitivity Setting

BCM determines light & rain sensor sensitivity according to wiper volume dial position.

Wiper volume dial position	Sensitivity
1	Low sensitivity
2	Low-medium sensitivity
3	Medium-high sensitivity
4	High sensitivity

note	The auto wiping operation setting of the linked or not linked with light & rain sensor can be changed by combination meter setting.

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

Splash mode operation

Front wiper is operated at high 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
Electric motor 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 transmits the front wiper request signal (RETURN) to IPDM E/R via CAN communication when the front wiper switch is turned OFF.
IPDM E/R detects the front wiper stop position signal from the front wiper motor to find out the front wiper motor position (stop position/except stop position).
When IPDM E/R receives the front wiper request signal (RETURN) from BCM and the front wiper motor position is not in the stop position, IPDM E/R turns ON the front wiper relay until the front wiper motor returns to the stop position.
When the front wiper motor returns to the stop position, IPDM E/R transmits front wiper status signal to BCM via CAN communication.
When BCM receives front wiper status signal from IPDM E/R, BCM transmits the front wiper request signal (STOP) to IPDM E/R via CAN communication.

FRONT WIPER OPERATION LINKED WITH WASHER

BCM transmits the front wiper request signal (LOW) 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 (LOW) so that the front wiper operates approximately two times when the front washer switch OFF is detected.
Washer linked operating condition of front wiper
- Electric motor switch ON
- Front washer switch ON
IPDM E/R turns ON the integrated front wiper relay according to the front wiper request signal (LOW).
BCM transmits the front washer pump request signal to IPDM E/R via CAN communication depending on operating condition.
IPDM E/R turns ON /OFF the front washer relay according to the front washer pump request signal. IPDM E/R provides the power supply to operate the front and rear washer pump.

WIPER LINKED AUTO LIGHTING FUNCTION

When lighting switch is in the AUTO position, front wiper operates, and then headlight ON. Refer to System Description

<Without light & rain sensor> or System Description

<With light & rain sensor>.

FRONT WIPER SERVICE POSITION OPERATION

When this operation is activated, front wiper operates at low speed and stops in the service position so that front wiper arms can pulled up without contacting the hood.

Following two methods are the operation procedures.

Method A: With Electric Motor Switch ON

Turn the power supply mode of the electric motor switch to ON.
Confirm the vehicle is stop.
Confirm front wiper is in stop position.
Quickly (Within 0.5 second) move wiper switch lever to MIST position twice, wiper will move to service position.
To exit service position, operate front wiper switch.

Method B: With Electric Motor Switch OFF

Turn the power supply mode of the electric motor switch to OFF from any other position.
Confirm front wiper is in stop position.
Within 1 minute after turning the power supply mode of the electric motor switch to OFF, quickly (Within 0.5 second) move wiper switch lever to MIST position twice, wiper will move to service position.
To exit service position, turn the power supply mode of the electric motor switch to ON and operate front wiper switch.

note	Front wiper arms can exit from service position without turning the power supply mode of the electric motor switch to ON if front wiper switch is operated within 1 minute after turning the power supply mode of the electric motor switch to OFF.