GMC Chevy Colorado 2023 Manual page 76

2-52 Wipers and Washers
bouncing off the windshield. With a dry windshield, all
light bounced off the windshield is returned to the optic
sensor. As water accumulates on the windshield, the
light input to the optic sensor is diffused and reduced.
The amount of light reduction corresponds directly to
the amount of water on the windshield. The
B117A Windshield Outside Moisture/Ambient Light and
Humidity Sensor interprets the amount of light returned
and communicates this info to the K9 Body Control
Module, which will control intermittent wiper operation
based on the sensitivity selection of the S82 Windshield
Wiper/Washer Switch and the amount of water on the
windshield.
M75 Windshield Wiper Motor
The M75 Windshield Wiper Motor receives a constant
chassis ground. B+ is controlled by the
KR12B Windshield Wiper Relay and KR12C Windshield
Wiper Speed Control Relay being operated by the
K219 Lighting Control Module.
The M75 Windshield Wiper Motor includes a DC motor
and an internal position switch to indicate the wiper
park position. When wiper operation is requested, the
DC motor spins. The spinning motor is directed to a
wiping motion through the windshield wiper
transmission. When wiper operation is no longer
required, the M75 Windshield Wiper Motor will continue
spinning until the internal position switch indicates it is
in the park position.
Windshield Washer Operation
The windshield washer system allows the driver to
clean the vehicle s windshield using a discrete switch.
The washer system uses the S82 Windshield Wiper/
Washer Switch as the primary means of driver control.
The S82 Windshield Wiper/Washer Switch is a discrete
input to the K9 Body Control Module. The K9 Body
Control Module communicates with the K219 Lighting
Control Module over CAN to control G24 Windshield
Washer Pump activation. The K9 Body Control Module
also communicates with the K219 Lighting Control
Module to control B+ to the M75 Windshield Wiper
Motor during operation.
The windshield wiper system consists of the following
electrical components:
S82 Windshield Wiper/Washer Switch
K9 Body Control Module
K219 Lighting Control Module
KR12B Windshield Wiper Relay
KR11 Windshield Washer Pump Relay
G24 Windshield Washer Pump
M75 Windshield Wiper Motor
B118B Windshield Washer Fluid Level Switch
Windshield Washer Components
S82 Windshield Wiper/Washer Switch
The S82 Windshield Wiper/Washer Switch is the
primary input to the K9 Body Control Module for the
driver to control windshield washer operation.
The K9 Body Control Module provides the
S82 Windshield Wiper/Washer Switch with ground
through a single low reference circuit and monitors the
switch position through a single signal circuit. Voltage is
applied by the K9 Body Control Module to this signal
circuit and voltage drop is monitored to determine
switch selection. The S82 Windshield Wiper/Washer
Switch contains an internal switch dedicated to
windshield washer operation. When the switch is
closed, the signal circuit is pulled to ground, indicating
washer operation is requested.
K9 Body Control Module
The K9 Body Control Module responds to input
requests from the S82 Windshield Wiper/Washer
Switch. The K9 Body Control Module provides a
constant ground for the S82 Windshield Wiper/Washer
Switch and monitors a signal circuit to determine the
requested windshield wiper position.
When washer operation is requested, the K9 Body
Control Module will send a CAN message to the
K219 Lighting Control Module to enable the
G24 Windshield Washer Pump, as well as supply B+ to
the M75 Windshield Wiper Motor for low speed wiper
operation.
K219 Lighting Control Module
The K219 Lighting Control Module controls B+ to the
G24 Windshield Washer Pump. When washer
operation is requested from a CAN message from the
K9 Body Control Module, the K219 Lighting Control
Module will apply voltage via a high side driver to the
KR11 Windshield Washer Pump Relay. The
K219 Lighting Control Module also controls B+ to the
M75 Windshield Wiper Motor. When washer operation
is requested, the K219 Lighting Control Module will
apply voltage via a high side driver to the
KR12B Windshield Wiper Relay.
The K219 Lighting Control Module also monitors the
B118B Windshield Washer Fluid Level Switch through a
discrete signal circuit.
KR12B Windshield Wiper Relay
The KR12B Windshield Wiper Relay supplies B+ to the
M75 Windshield Wiper Motor and is controlled by the
K219 Lighting Control Module. The coil side of the relay
receives a constant chassis ground and the switch side
receives a constant B+. When wiper operation is
requested, the K219 Lighting Control Module will
provide voltage to the coil side of the relay. This will
energize the relay, closing the high current contact, and
supply B+ to the M75 Windshield Wiper Motor through
the KR12C Windshield Wiper Speed Control Relay,
enabling wiper operation.
KR11 Windshield Washer Pump Relay
The KR11 Windshield Washer Pump Relay supplies B+
to the G24 Windshield Washer Pump and is controlled
by the K219 Lighting Control Module. The coil side of
the relay receives a constant chassis ground and the
switch side receives a constant B+. When wiper
operation is requested, the K219 Lighting Control
Module will provide voltage to the coil side of the relay.
This will energize the relay, closing the high current
contact, and supply B+ to the G24 Windshield Washer
Pump, enabling washer pump operation.
2023 - Colorado Electrical Body Builder Manual