Infiniti QX56 (Z62). Manual - part 1382

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< SYSTEM DESCRIPTION >

COMPONENT PARTS

Component Description

INFOID:0000000006300449

Washer Switch

INFOID:0000000006300450

• Washer switch is integrated combination switch.
• Combination switch switches polarity between front washer operating and rear washer operating to supply

power to the washer pump on ground.

Part

Description

IPDM E/R

• Controls the integrated relay according to the request (via CAN communication) from BCM.
• Performs the auto stop control of the front wiper.

BCM

• Judges the each switch status by the combination switch reading function.
• Requests (via CAN communication) the front wiper relay and the front wiper high relay ON to 

IPDM E/R.

• Supplies power to the rear wiper motor.
• Performs the auto stop control of the rear wiper.
• Requests (via CAN communication) the headlamp washer relay ON to IPDM I/R.

TCM

Transmits the shift position signal to BCM via CAN communication.

Light & rain sensor

Detects water droplets on the windshield with infrared rays, and transmits the rain sensor signal 
to BCM via the rain sensor serial link.

Combination switch
(Wiper & washer switch)

Refer to 

BCS-7, "COMBINATION SWITCH READING SYSTEM : System Description"

.

Washer switch

Refer to 

WW-6, "Washer Switch"

.

Washer pump

• Washer fluid is sprayed according to washer switch states.
• Switching between front washer and rear washer is performed according to the voltage polarity 

change to washer pomp.

Headlamp washer pump

Washer fluid is sprayed according to washer switch states and headlamp switch status.

Front wiper motor

• IPDM E/R controls front wiper operation.
• Front wiper auto stop signal is transmitted to IPDM E/R.

Rear wiper motor

• BCM controls rear wiper operation.
• Rear wiper auto stop signal is transmitted to BCM.

Combination meter

Transmits the vehicle speed signal to BCM via CAN communication.

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SYSTEM

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< SYSTEM DESCRIPTION >

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SYSTEM

FRONT WIPER AND WASHER SYSTEM

FRONT WIPER AND WASHER SYSTEM : System Diagram

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FRONT WIPER AND WASHER SYSTEM : System Description

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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
Combination meter indicates low washer fluid level warning judged by the signal from the washer level switch.
For details of low washer fluid level warning, refer to 

MWI-16, "MASTER WARNING LAMP : System Descrip-

tion"

.

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 oper-

ating 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 (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)
• IPDM E/R turns ON the integrated front wiper relay according to the front wiper request signal (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
• IPDM E/R turns ON the integrated front wiper relay and the front wiper high relay according to the front wiper

request signal (HI).

JPLIA1630GB

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< SYSTEM DESCRIPTION >

SYSTEM

FRONT WIPER AUTO OPERATION

Rain Detection

Rain level and sensor conditions are detected by light & rain sensor.
• BCM transmits the vehicle conditions (vehicle speed, front wiper condition, rain sensor sensitivity setting,

etc.) to the light & rain sensor via the rain sensor serial link.

• 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 rain sensor serial link.

Auto Wiping Operation 

• BCM receives the wiping speed request signal from the light & rain sensor via the rain sensor serial link.
• BCM controls front wiper operation according to the wiping speed request signals. 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 condi-
tions.

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 instan-
taneously 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 stop position signal from the front wiper motor and detects the front wiper

motor position (stop position/except stop position).

Wiper volume dial position

Sensitivity

1

High sensitivity

2

3

Medium

−

high sensitivity

4

5

Low

−

medium sensitivity

6

7

Low sensitivity

SYSTEM

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• When the front wiper request signal is stopped, IPDM E/R turns ON the front wiper 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 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 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 relay according to the front wiper request signal (LO).

WIPER LINKED AUTO LIGHTING FUNCTION

When light switch is in the AUTO position, front wiper operates, and then headlamp illuminates. Refer to 

EXL-

11, "AUTO LIGHT SYSTEM : System Description (For CANADA)"

 or 

EXL-12, "AUTO LIGHT SYSTEM : Sys-

tem Description (Except for CANADA)"

.

FRONT WIPER AND WASHER SYSTEM : Fail-safe

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IPDM E/R

When CAN communication with ECM and BCM is impossible, IPDM E/R performs fail-safe control. After CAN
communication recovers normally, it also returns to normal control.

If No CAN Communication Is Available With BCM

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