Nissan Altima (L32) 2007-2012 Service Manual: 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-III. Refer to BCS-26, "WIPER : CONSULT - III Function".

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 OFF.

• IPDM E/R turns the front wiper relay OFF when the ignition switch 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

- Ignition switch ON

• 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. Refer to PCS-43, "Fail Safe".

Component Parts Location

1. Combination switch M28 (wiper switch) (coupe shown, sedan similar)

2. Combination meter M24

3. Front wiper motor E25

4. IPDM E/R E17, E18, E200

5. Front washer motor E226

6. BCM M16, M17, M18, M19 (view with instrument panel removed)

Component Description