Vehicle Entry Gate Will Not Open on Schedule.

Tailgate? Farm Gate? Automatic sliding gate?

Year make model
in all vehicle questions.

make model (what it is)
in all others please. We need those details to solve!

Here is how it works !
Liftgate Locking Operation
The lift gate will lock any time the vehicle is shifted out of park on vehicles equipped with an automatic transmission and at vehicle speeds exceeding 5 kph with manual transmission. This happens in conjunction with auto door locks if enabled or independently of auto door locks if the feature is disabled. This ensures that the lift gate is locked anytime the vehicle is shifted out of park or when the vehicle is in motion.
The lift gate lock relay supply and coil sides receive a constant voltage through the battery voltage supply circuit and the ECC fuse. The normally closed contact is connected to ground and the control side is connected to the body control module (BCM). A lock function will occur when a door lock switch activation, keyless entry lock transmission, auto door lock function or a lift gate lock function has been received by the BCM. The BCM will then ground the control side of the lift gate lock relay. This energizes the relay and allows voltage to be applied to the lift gate lock actuator lock control circuit. Since the other side of the lift gate lock actuator is connected to the normally closed contacts of the door unlock relay to ground, the lift gate will lock. When an unlock function occurs the BCM will ground the control side of the unlock relay and the rear doors and lift gate will unlock.
The BCM also runs diagnostics on the lift gate lock relay control circuit and will set DTC B3825 as current and also send a Class 2 message to the DIC. The DIC will display REPLACE LIFTGATE FUSE to inform the driver that a fault has been detected in the lift gate lock circuit and that the lift gate is not locked. Faults that will set the DTC and cause the DIC to display the message could be any of the following:
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An open ECC fuse

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An open or short to ground in the lift gate lock relay battery positive voltage circuit

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A faulty lift gate lock relay

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An open or short to ground in the lift gate lock relay control circuit

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A short to ground in the lift gate lock actuator lock control circuit

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A faulty BCM

make and model needs to be reposted

You mite find it on the glove box sides or on the back gate just a sticker with the 5 numbers on it . It is be hind the radio

Try pressing the unlock button twice

first guess a bad electric motor
second guess to much resistance between the gate and the tracks try manually moving the gate does it get stuck at some point
3rd tighten any and all loose bolts throughout the system

It is not standard equipment.
Here is what the manual says (copied and pasted from owners manual)

HOMELINK WIRELESS CONTROL SYSTEM

(IF EQUIPPED )

The HomeLink Wireless Control

System, located on the driver's visor,

provides a convenient way to

replace up to three hand-held

transmitters with a single built-in

device. This feature will learn the

radio frequency codes of most

transmitters to operate garage

doors, entry gate operators, security systems, entry door locks, and
home or office lighting

OPEN THE TAIL GATE ON TH INSIDE OF THE TAIL GATE SOME TIME THEY PUT A LITTLE STICKER WITH THE NUMEROS.

you can increase the timer that the system checks for dial tone... but you BEST bet would be to put the doorking into Intercom mode

make sure the back window is all the way up then try the wiper, if it still does not work then it is a sensor for the rear window (about $30.00) if you installed it yourself

I’m happy to help further over the phone at https://www.6ya.com/expert/john_5260ce46f2f674cc