2-80 Vehicle Access
• Right pickup box auxiliary endgate latch
• Left pickup box endgate latch relay
• Right pickup box endgate latch relay
• Left pickup box auxiliary endgate latch relay
• Right pickup box auxiliary endgate latch relay
Endgate Release Operation (With
MutiPro Tailgate Option)
Interior Endgate Release Switch
The body control module monitors the voltage level of
the endgate unlatch signal circuit so that when the
switch is pressed contacts within the switch closes
providing a ground path for the endgate unlatch signal
circuit, the voltage within the signal circuit is pulled low,
the body control module will detect the voltage drop
and if the passenger doors are unlocked, will energize
the left pickup box endgate latch relay and right pickup
box endgate latch relay.
Exterior Endgate Release Switch
The body control module monitors the status of the
vehicle doors, if the doors are locked the body control
module will ignore the request from the exterior pickup
box endgate control switch. If the passenger doors
have been commanded to unlock, pressing the
appropriate exterior pickup box endgate control switch
will close contacts within the switch and provide a
ground path for the major or minor endgate unlatch
signal circuit, the body control module will detect the
voltage drop and will energize the appropriate pickup
box endgate latch relays.
If the vehicle has been equipped with the passive
keyless entry system and the keyless entry transmit ter
is within 3 feet (1 meter) of the endgate, pressing the
exterior pickup box endgate control switch will also
function in the same manner but without unlocking the
passenger doors. Refer to
Keyless Entry System
Description and Operation for more information on the
passive keyless entry system.
Major Pickup Box Endgate
Note: The auxiliary pickup box endgate must be in the
latched position before commanding the major pickup
box endgate to release. The body control module will
disable the major pickup box endgate release function
if the auxiliary pickup box endgate is open or ajar.
When body control module receives a major endgate
release command from the exterior pickup box endgate
control switch, the body control module applies brief
pulse of voltage to the left and right pickup box endgate
latch relay control circuits, which energizes the coil side
of the relays. The switch side of the left and right pickup
box endgate latch relay then momentarily closes,
supplying a brief pulse of battery positive voltage to the
left and right pickup box endgate latches. The left and
right pickup box endgate latches will become energized
and the latches will activate releasing the major
endgate so that it may be manually lowered to an open
position.
Minor Pickup Box Endgate
When body control module receives a major endgate
release command from the exterior pickup box endgate
control switch, the body control module applies brief
pulse of voltage to the left and right pickup box auxiliary
endgate latch relay control circuits, which energizes the
coil side of the relays. The switch side of the left and
right pickup box auxiliary endgate latch relay then
momentarily closes, supplying a brief pulse of battery
positive voltage to the left and right pickup box auxiliary
endgate latches. The left and right pickup box auxiliary
endgate latches will become energized and the latches
will activate releasing the minor endgate so that it may
be manually lowered to an open position.
Hood Ajar Indicator Description and
Operation
Hood Ajar Switch
The body control module (BCM) applies B+ to the hood
ajar signal circuit and monitors the voltage to determine
the position of the hood. When the hood is open, the
switch is open and voltage remains high. When the
hood is closed, the switch is closed and the voltage is
pulled low.
The BCM uses the hood ajar switch as a content theft
deterrent alarm trigger.
Hood Ajar Indicator/Message
When the hood is ajar, a message is displayed on the
DIC or the hood ajar indicator will be illuminated.
Power Door Locks Description and
Operation
Door Lock System Components
The power door lock system consists of the following
components:
• Driver door lock switch
• Passenger door lock switch
• Left rear door lock switch
• Right rear door lock switch
• Driver front side door window control switch
• Passenger front side door window switch
• Driver front side door latch
• Passenger front side door latch
• Left rear side door latch
• Right rear side door latch
• Exterior door handle switches
• Body control module
• Lighting control module
Door Lock System Controls
The power door lock system can be controlled by any of
the following:
• Power door lock switch activation
• Keyless entry lock or unlock command
• Delayed locking command
2022 - Silverado 1500 (New) Electrical Body Builder Manual
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