Nissan Maxima Service and Repair Manual: System description

FRONT WIPER AND WASHER SYSTEM

System Diagram

System Description

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

• BCM transmits the front wiper request signal (INT) to IPDM E/R with CAN communication depending on the
  front wiper INT operating condition and intermittent operation delay interval according to the wiper intermittent
  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 (INT).
• BCM detects stop position/except stop position of the front wiper motor according to the front wiper auto stop
  signal received from IPDM E/R with CAN communication.
• BCM transmits the front wiper request signal (INT) again after the intermittent operation delay interval.

NOTE:
Front wiper intermittent operation can be set to the operation with vehicle speed by CONSULT. Refer to BCS-
23, "WIPER : CONSULT Function (BCM - WIPER)".

Front wiper intermittent operation with vehicle speed

• BCM calculates the intermittent operation delay interval from the following

• Vehicle speed signal (received from the combination meter with CAN communication)
• Wiper intermittent dial position

*: When without vehicle speed setting

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).
• 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 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 front washer motor is grounded through the combination switch when the front washer switch is ON.

FRONT WIPER FAIL−SAFE OPERATION

When the front wiper auto stop circuit is malfunctioning, IPDM E/R performs the fail-safe function.

Component Parts Location

1. Front washer motor E226 (view with
   front bumper cover removed)
2. Combination switch (wiper and washer
   switch) M28
3. Combination meter M24
4. Front wiper motor E25
5. IPDM E/R E17, E18, E200
6. BCM M16, M17, M18, M19 (view with
   instrument panel removed)

Component Description

• Diagnosis system (BCM)