Keyless entry is not working

Because it needs to be deactivated by the remote control first the alarm thinks a theft is in progress when you you use your key it's only turning the cylinder it doesn't deactivate the alarm the key is mechanically unlocking the door lock at the back of the door where you close it and it locks on the door post attached to the frame the alarm is electronic and works off the interior lights once that light goes on it activates so when you open the door it happens completely normal operations if you have keyless entry it is connected to the alarm and it will not sound it but just the key will ok Heidi your fine no problems here have a great day and relax good luck stephen

The Lock's lock from the door switches ? If they do it's not a fuse problem . Which of these does your vehicle have ?
Keyless Entry System Description and Operation (with Accessory 2 Way Remote)
Keyless Entry System Description and Operation (without Accessory 2 Way remote)

The keyless entry system is a vehicle entry device. The keyless entry system is used in conjunction with the body control module (BCM) to remotely activate certain vehicle features. Keyless entry will lock/unlock the doors/liftgate when a corresponding button on the keyless entry transmitter is pressed. This is accomplished by the transmitter sending a radio frequency to the remote control door lock receiver (RCDLR). The RCDLR interprets the signal and activates the requested function via a serial data message to the BCM. A low transmitter or vehicle battery or radio frequency (RF) interference from aftermarket devices, such as 2-way radios, power inverters, computers, etc., may cause a system malfunction. High RF traffic areas may also cause interference that could lead to a malfunction. Keyless entry allows you to operate the following components:
• Door locks
• Liftgate lock
• Vehicle locator/Panic alarm
• Illuminated entry lamps
• Remote vehicle start
The keyless entry system has the following components:
• Keyless entry transmitters
• Keyless entry antenna
• 2 Way Advanced Remote Start RCDLR
• BCM

Your best bet , take it to a GM dealer .

Viper Keyless Entry Systems

https://www.viper.com/car/keylessentry/

Viper is the industry leader in keyless entry systems. Add the convenience of keylessentry to virtually any vehicle - even vehicles without power door locks!

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20 out of 32 products in Alarms, Remote Car Starters, Keyless Entry & Locks ..... ofKeyless Entry & Car Alarms allow you to lock and unlock power door locks.
How to program your keyless entry keypad - Ford Ownerhttps://owner.ford.com/.../locks.../how-to-program...Ford Motor CompanyDiscover how to lock and unlock your doors and how to program memory settings that will adjust seats & mirrors for each driver.SecuriCode™ Keyless Entry Keypad - Ford Ownerowner.ford.com/.../locks.../securicode-keyless-entr...Ford Motor CompanyLearn how to set a 5 digit SecuriCode on the Ford keyless entry keypad. ... Sign out. Register/Sign In · Your Vehicle. Service & Maintenance. Service & .... vehicle's SecuriCode keypad to lock and unlock your doors without having to use a key. ... Thekeypad will go into an anti-scan mode if you enter the wrong code seven ...How Programming Your Keyless Entry Can Make ... - Ford Life

Go on youtube and put in how to reset your car key after renewing key fob battery good luck colin

The 'Keyless Entry & Burglar Alarm System" is activated. You must 'Disarm' the system using the Keyless Entry Remove (Key Fob) to "Reset" the system. The reason the engine won't start is due to the burglar alarm - it has a "Starter Kill" circuit which is activated when the alarm is activated. The alarm must be DEactivated to DEactivate the 'Starter Kill' circuit.
Another way to start the engine is to get in the car, put the key in the ignition and turn it to 'ON" and wait 3 to 5 minutes until the emergency flashers stop/turn off. Afterward, you should be able to start the engine. NOTE: This does NOT reset the burglar alarm. It will go off again when you enter the vehicle without using the remote/key fob.

usually after opening the door you can deactivate the alarm by pushing th unlock button or simply insert keyy in ignition and turn it on.

locking and unlocking the drivers door with the key should deactivate the alarm

locking and unlocking with the key is to deactivate the alarm not activate it, the alarm is activated every time the car is locked with the remote automatically, u need do nothing else

System operation
System will automatically lock all doors when vehicle is driven in excess of 15 mph
Pressing UNLOCK (on remote) once deactivates system and unlocks driver door only
Pressing UNLOCK (on remote) twice w/in 5 seconds deactivates system and unlocks all doors
Alarm/central locking functions can be altered using remote transmitter


Programming

Access data link connector (DLC)- druvers sude fascia
Switch ignition on
Jump DLC terminal 1 and ground
Ensure doors lock and unlock, indicating programming mode active
Press any button of each remote to be programmed
Ensure doors lock and unlock after each remote operation - indicating programming complete
Remove jump lead to exit programmming code

A maximum of two remotes can be programmed

The fuse for the alarm is under the hood. Give a good look and you should find it. Once you have pulled it it will deactivate the alarm I am not sure if this is exactly your problem since you said that the car wont start.... but it is worth a try.