Wiper and Washer Systems: Description and Operation

FRONT WIPER AND WASHER SYSTEM

System Description
Through the adoption of vehicle speed detect-type intermittent wiper, Front Wiper System changes wiper's intermittent time when the engine is stopped and while driving.

Vehicle speed signal is send from the combination meter to BCM. BCM controls intermittent activation time and coupled activation of washer and wiper.

WIPER OPERATION

Description

The wiper switch is controlled by a lover built into the combination switch.

There are three wiper switch positions
- LO speed
- HI speed
- INT (intermittent)

Power is supplied at all times
- through 10 A fuse [No.3, located in the fuse block (J/B) No.1]
- to BCM terminal 105

With the ignition switch in the ON or START position, power is supplied
- through 20 A fuse [No.34, located in the fuse block (J/B) No.2]
- to front wiper motor terminal 4 and
- to front wiper relay terminal 1
- through 10 A fuse [No.1, located in the fuse block (J/B) No.1]
- to BCM terminal 68
- through 10 A fuse [No.9, located in the fuse block (J/B) No.1]
- to combination meter terminal 59

Ground is supplied to front wiper switch terminals 17 and 20 through grounds M25 and M115.

Low (MIST) and High Speed Wiper Operation
When the front wiper switch is placed in the LO or MIST position, ground is supplied
- through front wiper switch terminal 14
- to front wiper motor terminal 6.

With power and ground supplied, the front wiper motor operates at low speed.

When the front wiper switch is placed in the HI position, ground is supplied
- through front wiper switch terminal 16
- to front wiper motor terminal 5.

With power and ground supplied, the front wiper motor operates at high speed.

Auto Stop Operation
When the front wiper switch is placed in the OFF position, the front wiper motor will continue to operate until the wiper arms reach the base of the windshield (Auto stop). When the front wiper switch is placed in the OFF position, ground is supplied
- from front wiper switch terminal 14
- to front wiper motor terminal 6, in order to continue front wiper motor operation at low speed.

Ground is also supplied until the wiper arms reaches the base of the windshield
- through front wiper switch terminal 13
- to front wiper relay terminal 3
- through front wiper relay terminal 4
- to front wiper motor terminal 3
- through front wiper motor terminal 1, and
- through grounds E42 and E62.

When the wiper arms reach the base of the windshield, the switch in the front wiper motor moves to the "STOP" position. The ground path is interrupted and the front wiper motor stops.

Intermittent Operation
Intermittent operation is controlled by the BCM. When the front wiper switch is placed in the INT position, ground is supplied
- to BCM terminal 9
- from front wiper switch terminal 15
- through grounds M25 and M115.

The desired interval time is input
- to front wiper switch terminal 19
- from BCM terminal 48
- to BCM terminal 49
- from combination meter terminal 18 (vehicle speed pulse).

The desired interval time is input
- to front wiper relay terminal 2
- from BCM terminal 128.

With power and ground supplied, the front wiper relay is activated. When activated, an intermittent ground is supplied
- to front wiper motor terminal 6
- through front wiper switch terminal 14
- to front wiper switch terminal 13
- through front wiper relay terminal 3
- to front wiper relay terminal 5

- through grounds E24 and E44.

Front wiper motor operates at desired interval with BCM terminal 9 grounded. Intermittent operation can be adjusted from:
- Approx. 0.9 - 45 sec. (when vehicle is stopped)
- Approx. 0.4 - 30 sec. (when vehicle is moving)

Judgement on vehicle stopped or moving:
- Stopped -> Moving: More than 5 km/h (3 MPH)
- Moving -> Stopped: Less than 2 km/h (1 MPH)

WASHER OPERATION
With the ignition switch in the ON or START position, power is supplied
- through 20 A fuse [No. 34, located in the fuse block (J/B) No. 2]
- to front washer motor terminal 1.

When the lever is pulled to the WASH position, ground is supplied
- to front washer motor terminal 2, and
- to BCM terminal 4
- from terminal 18 of front wiper switch
- through terminal 17 of front wiper switch
- through grounds M25 and M115.

With power and ground supplied, the front washer motor operates. The front wiper motor operates at low speed for about 3 seconds. This feature is controlled by the BCM in the same manner as the intermittent operation.