Vehicle Access 2-79
For vehicles without the optional passive keyless entry,
when the exterior pickup box endgate control switch is
pressed, the rear gate module will check the status of
the vehicle door locks by sending a serial data
message to the body control module requesting the
door lock status. If the vehicle doors are locked, the
rear gate module will ignore the signal from the exterior
pickup box endgate control switch. If the vehicle doors
are unlocked, the rear gate module will permit the
endgate to unlatch and power open when the exterior
pickup box endgate control switch is pressed.
For vehicles with the optional passive keyless entry
system, the keyless entry control module monitors the
proximity of the keyless entry transmitter. If the exterior
pickup box endgate control switch is pressed and the
keyless entry transmitter is within range, the keyless
entry control module will send a serial data message to
the rear gate module indicating the presence of the
keyless entry transmitter and the rear gate module will
permit the endgate to unlatch and power open. If the
doors are locked and the keyless entry transmitter is
not within range, the rear gate module will ignore the
signal from the exterior pickup box endgate control
switch.
Manual Endgate Operation
The endgate can be manually closed from the full-open
position when the endgate is lifted in a continuou s
motion. If the endgate motion is stopped between the
full-open and half-closed positions, the lift to close
feature can engage and power close the endgate. If the
touch pad is pressed during power operation, the
endgate will stop and allow manual operation. The
endgate must be held after stopping, or it will continue
to open
Tailgate Release Unavailable Driver
Information Center Message
Power Endgate Functions Disabled Without
Setting DTCs
The driver information center displays Tailgate Release
Unavailable when a thermal inhibit occurs in the latch
or drive unit or the position count is out of range.
The power endgate functions will be restored by
performing the following actions:
• Closing the endgate which will reset the position
counts
• Closing the endgate and removing the F20DL 30A
fuse for greater than 5 minutes
Power Endgate Functions Disabled With DTCs
Current
The driver information center displays Tailgate Release
Unavailable when the rear gate module control module
detects a malfunction in the power endgate system and
the system is disabled.
Endgate Description and Operation
(QT5 Without MultiPro Tailgate)
Endgate Release System Components
• Body control module (BCM)
• Pickup box endgate control switch-interior (Part of
the instrument panel multifunction switch)
• Pickup box endgate control switch-exterior
• Pickup box endgate unlatch actuator
• Pickup box endgate unlatch relay
Endgate Release Operation (Without
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 pickup box endgate unlatch 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 exterior
pickup box endgate control switch will close contacts
within the switch and provide a ground path for the
endgate unlatch signal circuit, the body control module
will detect the voltage drop and will energize the pickup
box endgate unlatch relay.
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.
Pickup Box Endgate Unlatch actuator
When body control module receives a endgate release
command from the exterior pickup box endgate control
switch, the body control module applies brief pulse of
voltage to the pickup box endgate unlatch relay control
circuit, which energizes the coil side of the relay. The
switch side of the pickup box endgate unlatch relay
then momentarily closes, supplying a brief pulse of
battery positive voltage to the pickup box endgate
unlatch actuator. The pickup box endgate unlatch
actuator is continuously grounded and when it receives
the voltage pulse, it will become energized and the
latch will activate releasing the endgate so that it may
be manually lowered to an open position.
Endgate Description and Operation
(QT5 With MultiPro Tailgate)
Endgate Release System Components
• Body control module (BCM)
• Pickup box endgate control switch-interior (Part of
the instrument panel multifunction switch)
• Pickup box endgate control switch-exterior
• Left pickup box endgate latch
• Right pickup box endgate latch
• Left pickup box auxiliary endgate latch
2022 - Silverado 1500 (New) Electrical Body Builder Manual
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