Vehicle Access 2-81
• Automatic door lock command
• When the OnStar
®
system is used to unlock the
driver door
Door Lock and Unlock Operation
The driver or passenger front side door window control
switch will monitor the voltage of their respective door
lock switches, when the driver or passenger door lock
switch is activated in the lock or unlock position the
signal voltage will be pulled low, the corresponding
front side door window control switch will detect the
voltage drop in the signal circuit and will send a serial
data message to the body control module requesting
the door lock or unlock command.
The lighting control module will monitor the voltage of
the left rear and right rear door lock switches, when the
left rear or right rear door lock switch is activated in the
lock or unlock position the signal voltage will be pulled
low, the lighting control module will detect the voltage
drop in the signal circuit and will send a serial data
message to the body control module requesting the
door lock or unlock command.
The body control module upon receipt of a lock or
unlock request, will supply battery voltage to the door
lock actuator lock or unlock control circuits. Since the
opposite side of the lock actuator is connected to
ground through the other lock actuator control circuit,
the doors, and fuel filler door will then lock or unlock as
commanded.
The following control circuits are used to operate the
door lock actuators:
• Driver door unlock only
• Passenger and rear door unlock
• All door lock
This sequence and be modified through the
personalization settings
Passive Door Lock/Unlock Operation
The exterior door handle switch signal circuits provide
inputs to the body control module when the exterior
door handle switches are activated. These inputs allow
the body control module to detect a door lock or a door
unlock request. The body control module provides a 7 V
signal to each exterior door handle switch via the door
handle switch signal circuits. When a door handle
switch is pressed , the switch closes and the voltage
signal within the signal circuit is pulled to ground. The
body control module will detect the voltage drop and a
low frequency antenna will transmit a challenge to the
keyless entry transmitter. If the challeng e is met, the
keyless entry transmitter will respond, and the body
control module will command the door(s) to be locked
or unlocked
2022 - Silverado 1500 (New) Electrical Body Builder Manual
To Next Page
Loading...