Wipers / Washers; General Description; Wiper/Washer System Description And Operation; Schematic And Routing Diagram - Suzuki XL7 2007 Service Manual

9D-1 Wipers / Washers:

Wipers / Washers

Wiper/Washer System Description and
Operation
The windshield wiper/washer system consists of front
and rear wipers. The front and rear wipers are operative
when the vehicle is in accessory or run. The front wipers
have 4 different modes: Mist, Intermittent, Low, and
High. When the front wipers are in the intermittent mode,
there are 5 delay modes to chose from, commanded by
the windshield wiper washer switch through the body
control module (BCM). The rear wipers has an only one
mode.
Rear Wiper Operation
During rear wiper operation, the wiper switch portion of
the rear wiper/washer switch provides a ground signal to
the rear wiper motor indicating the rear wipers are
requested. At this point the rear will motor will activate.
The wiper motor is supplied B+ through the I/P fuse
block and accessory voltage from the BCM.
Rear wiper operation will be suspended when the liftgate
is open. The rear wiper motor monitors the liftgate ajar
switch to determine when the liftgate is open.
Low and Intermittent Operation (Front Wipers)
During Low and Intermittent operation, the windshield
wiper washer switch provides a resistor ladder to
determine the amount of wiper delay requested. The
wiper delay is determined by the BCM based on the
input from the wiper washer switch. In the Low and
Intermittent position, the windshield wiper washer switch
supplies a ground signal to the windshield wiper switch
low signal circuit indicating to the BCM that intermittent
or low speed wiper operation is request. The resistor
ladder determines the voltage signal seen at the BCM,
with various voltage levels equaling different delay
speeds. Upon this signal, the BCM will apply B+ to the
WIPER PCB relay coil. The relay coil will become
energized, creating a magnetic field and closing the
relay switch. B+ will be applied to the windshield wiper
motor low control circuit. During low speed operation, the
BCM will supply B+ to relay continuously, operating the
wipers at a steady low speed. During intermittent
operation, the BCM will selectively supply B+, providing
the intermittent delay.

Wiper/Washer Schematics

General Description

Schematic and Routing Diagram

High Operation (Front Wipers)
In the High position, the windshield wiper washer switch
supplies a ground signal to the windshield wiper switch
high signal circuit indicating to the BCM that high speed
wipers are requested. Upon this signal, the BCM will
ground the WIPER HIGH PCB relay coil via the Front
Windshield Wiper High Signal Control circuit. The relay
coil will become energized, creating a magnetic field and
closing the relay switch. B+ will be applied to the
windshield wiper motor high control circuit.
Mist Operation (Front Wipers Only)
In the Mist position, the windshield wipers make one
sweep at low speed and returns to the park position and
functions in the same manner as the low speed
operation. If the windshield wiper washer switch is held
in Mist position, the windshield wipers will continue to
operate until the switch is released.
Park Position Operation
When the wipers are commanded on, B+ is supplied to
the windshield wiper motor park switch signal. With B+
applied, the wipers will park when in the at rest state.
Wash Operation (Front and Rear Wipers)
The front and rear washer systems use a common
windshield washer fluid pump. When either the front or
rear wiper is in the washer position voltage will be
supplied to one side of the windshield washer fluid pump
(depending on whether front or rear washer has been
requested), while the other side of the pump is
grounded.
During front washer requests, the windshield wiper
washer switch supplies a ground signal to the windshield
washer switch signal circuit indicating to the BCM that
washers are requested. Upon this signal, the BCM will
ground the WIPER PCB relay coil and the FRT
WASHER PCB relay. This will operate the wipers at a
low speed and activate the washer pump for as long as
the Wash switch is held.
During front washer requests, the washer portion of the
rear wiper/washer switch provides ground to the RR
WASH PCB relay and also supplies a signal to the rear
wiper motor indicating washer and wiper events are
requested.