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System Description
 
 
SYSTEM DIAGRAM
ComponentFunction
Front wiper motorRefer to Front Wiper Motor.
IPDM E/RControls 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 pumpRefer to Front And Rear Washer Pump.
Front washer pump relayControls 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 HIGH relay according to the front wiper request signal. IPDM E/R provides the power supply to operate the front wiper HI/LO operation.
 
 
FRONT WIPER LO OPERATION
  • BCM transmits the front wiper request signal (LOW) 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)
  • IPDM E/R turns ON the integrated front wiper relay according to the front wiper request signal (LOW).
 
 
FRONT WIPER HI OPERATION
  • BCM transmits the front wiper request signal (HIGH) 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
  • IPDM E/R turns ON the integrated front wiper relay and the front wiper HIGH relay according to the front wiper request signal (HIGH).
 
 
FRONT WIPER INT 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 INT operating condition and intermittent operation delay interval according to the wiper volume dial position.
    Front wiper INT operating condition
    • Ignition 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.
noteThe front wiper INT 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 intervalVehicle speed
Accelerating0 – 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
Decelerating0 – 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 position121.0*18.915.812.6
211.2*10.18.46.7
35.6*5.04.23.4
42.8*2.52.11.7
51.4*1.31.10.8
*: 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
    • Ignition switch ON
    • Front wiper switch AUTO
noteWhen 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 positionSensitivity
1Low sensitivity
2Low-medium sensitivity
3Medium-high sensitivity
4High sensitivity
noteThe auto wiping operation setting of the linked or not linked with light & rain sensor can be changed by combination meter setting.
noteWhen 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
noteSplash 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 2 times when the front washer switch OFF is detected.
    Washer linked operating condition of front wiper
    • Ignition 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.
 
 
FRONT WIPER SERVICE POSITION OPERATION
When this operation is activated, front wiper operates at LO speed and stops in the service position so that front wiper arms can pulled up without contacting the hood.
Following 2 methods are the operation procedures.
 
 
Method A: With Ignition Switch ON
  1. Ignition switch ON.
  2. Confirm the vehicle is stop.
  3. Confirm front wiper is in stop position.
  4. Quickly (Within 0.5 second) move wiper switch lever to MIST position twice, wiper will move to service position.
  5. To exit service position, operate front wiper switch.
 
 
Method B: With Ignition Switch OFF
  1. Ignition switch OFF from any other position.
  2. Confirm front wiper is in stop position.
  3. Within 1 minute after turning ignition switch OFF, quickly (Within 0.5 second) move wiper switch lever to MIST position twice, wiper will move to service position.
  4. To exit service position, turn ignition switch ON and operate front wiper switch.
noteFront wiper arms can exit from service position without turning ignition switch ON if front wiper switch is operated within 1 minute after turning ignition switch OFF.