Infiniti QX56 (JA60). Manual - part 1032

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FRONT WIPER AND WASHER SYSTEM

FUNCTION DIAGNOSIS

FRONT WIPER AND WASHER SYSTEM

System Diagram

INFOID:0000000005146758

System Description

INFOID:0000000005146759

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 with 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 (LO) to IPDM E/R with 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 with 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).

FRONT WIPER INT OPERATION (LINKED WITH VEHICLE SPEED)

ALLIA0427GB

FRONT WIPER AND WASHER SYSTEM

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• BCM transmits the front wiper request signal (INT) to IPDM E/R with CAN communication according to the

front wiper INT operation condition and the intermittent operation delay interval judged value.

Front wiper INT operating condition

- Ignition switch ON

- Front wiper switch INT

Intermittent operation delay interval judgment

- BCM calculates the intermittent operation delay interval from the vehicle speed signal received from the

wiper dial position and the combination meter with CAN communication.

• IPDM E/R turns the integrated front wiper relay ON so that the front wiper is operated only once according to

the front wiper request signal (INT).

• 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 with CAN communication.

• BCM transmits the front wiper request signal (INT) again after the intermittent operation delay interval after

the front wiper motor 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 auto stop signal from the front wiper motor and detects the front wiper

motor position (stop position/except stop position).

Wiper intermittent dial posi-

tion

Intermittent 

operation 

interval

Intermittent operation delay Interval (s)

Vehicle speed

Vehicle stopped or 

less than 5 km/h 

(3.1 MPH)

5 km/h (3.1 MPH) 

or more or less 

than 35 km/h (21.7 

MPH)

35 km/h (21.7 

MPH) or more or 

less than 65 km/h 

(40.4 MPH)

65 km/h (40.4 

MPH) or more

1

Short

↑

↓

Long

0.8

0.6

0.4

0.24

2

4

3

2

1.2

3

10

7.5

5

3

4

16

12

8

4.8

5

24

18

12

7.2

6

32

24

16

9.6

7

42

31.5

21

12.6

JPLIA0094GB

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< FUNCTION DIAGNOSIS >

FRONT WIPER AND WASHER SYSTEM

• 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 with 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 3 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 front and rear washer motor 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).

FRONT WIPER FAIL

−SAFE OPERATION

• IPDM E/R performs the fail-safe function when the front wiper auto stop circuit is malfunctioning. Refer to

WW-68, "Fail Safe"

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JPLIA0095GB

FRONT WIPER AND WASHER SYSTEM

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Component Parts Location

INFOID:0000000005146760

Component Description

INFOID:0000000005146761

1.

IPDM E/R E121, E122, E124

2.

Air cleaner case

3.

Front and rear washer motor E105

4.

Washer fluid reservoir

5.

Front wiper motor E23
(view with cowl top removed)

6.

Combination switch M28

7.

BCM M18, M20

ALLIA0841ZZ

Part

Description

BCM

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

IPDM E/R.

IPDM E/R

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

Combination switch
(Wiper and washer 
switch)

Refer to 

WW-4, "System Diagram"

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Combination meter

Transmits the vehicle speed signal to BCM with CAN communication.