[Buick Lesabre 2004 Custom] Security light on, and a few other things, not sure how to fix

[Pwr_Commander]

So as of today my car ran perfectly fine but all of a sudden pulling back into my house the:

-Security light is on when I turn the car on. Turns off after the car is off for a while.
-The indicator showing Drive, Neutral, Reverse went away. (I can still shift into any of those fine, I just have to 'feel' when it sets into one of those positions to operate the car)
-The unlock/lock buttons don't work inside the car.
-The key FOB doesn't work, I have to open the door manually and also lock it manually from inside the car.
-The radio doesn't turn on. In fact, the clock isn't even on the display.
-The A/C seems to be blowing just hot air.
-The lights won't turn on.

The car drives fine, but all of this happened all of a sudden. I was wondering if anyone else had a similar issue to this and found out what the problem could be before I take it to a mechanic.
Thank you for any help you might have.

 

[MelsRegal]

Do you have more than one fob/key to try?
Have you checked for blown fuses in all fuse boxes?

 

[SAYBER]

So as of today my car ran perfectly fine but all of a sudden pulling back into my house the:

-Security light is on when I turn the car on. Turns off after the car is off for a while.
-The indicator showing Drive, Neutral, Reverse went away. (I can still shift into any of those fine, I just have to 'feel' when it sets into one of those positions to operate the car)
-The unlock/lock buttons don't work inside the car.
-The key FOB doesn't work, I have to open the door manually and also lock it manually from inside the car.
-The radio doesn't turn on. In fact, the clock isn't even on the display.
-The A/C seems to be blowing just hot air.
-The lights won't turn on.

The car drives fine, but all of this happened all of a sudden. I was wondering if anyone else had a similar issue to this and found out what the problem could be before I take it to a mechanic.
Thank you for any help you might have.

As far as your lights not on and things, check your dimmer lever in the headlamp switch on lower left dash. You have have it all the way down.

 

[SAYBER]

So as of today my car ran perfectly fine but all of a sudden pulling back into my house the:

-Security light is on when I turn the car on. Turns off after the car is off for a while.
-The indicator showing Drive, Neutral, Reverse went away. (I can still shift into any of those fine, I just have to 'feel' when it sets into one of those positions to operate the car)
-The unlock/lock buttons don't work inside the car.
-The key FOB doesn't work, I have to open the door manually and also lock it manually from inside the car.
-The radio doesn't turn on. In fact, the clock isn't even on the display.
-The A/C seems to be blowing just hot air.
-The lights won't turn on.

The car drives fine, but all of this happened all of a sudden. I was wondering if anyone else had a similar issue to this and found out what the problem could be before I take it to a mechanic.
Thank you for any help you might have.

Security light should go off after a bit. Normal.

 

[SAYBER]

So as of today my car ran perfectly fine but all of a sudden pulling back into my house the:

-Security light is on when I turn the car on. Turns off after the car is off for a while.
-The indicator showing Drive, Neutral, Reverse went away. (I can still shift into any of those fine, I just have to 'feel' when it sets into one of those positions to operate the car)
-The unlock/lock buttons don't work inside the car.
-The key FOB doesn't work, I have to open the door manually and also lock it manually from inside the car.
-The radio doesn't turn on. In fact, the clock isn't even on the display.
-The A/C seems to be blowing just hot air.
-The lights won't turn on.

The car drives fine, but all of this happened all of a sudden. I was wondering if anyone else had a similar issue to this and found out what the problem could be before I take it to a mechanic.
Thank you for any help you might have.

AC blows warm mostly because low on freon.

 

[SAYBER]

So as of today my car ran perfectly fine but all of a sudden pulling back into my house the:

-Security light is on when I turn the car on. Turns off after the car is off for a while.
-The indicator showing Drive, Neutral, Reverse went away. (I can still shift into any of those fine, I just have to 'feel' when it sets into one of those positions to operate the car)
-The unlock/lock buttons don't work inside the car.
-The key FOB doesn't work, I have to open the door manually and also lock it manually from inside the car.
-The radio doesn't turn on. In fact, the clock isn't even on the display.
-The A/C seems to be blowing just hot air.
-The lights won't turn on.

The car drives fine, but all of this happened all of a sudden. I was wondering if anyone else had a similar issue to this and found out what the problem could be before I take it to a mechanic.
Thank you for any help you might have.

Try replacing the battery in the key fob.

 

[SAYBER]

So as of today my car ran perfectly fine but all of a sudden pulling back into my house the:

-Security light is on when I turn the car on. Turns off after the car is off for a while.
-The indicator showing Drive, Neutral, Reverse went away. (I can still shift into any of those fine, I just have to 'feel' when it sets into one of those positions to operate the car)
-The unlock/lock buttons don't work inside the car.
-The key FOB doesn't work, I have to open the door manually and also lock it manually from inside the car.
-The radio doesn't turn on. In fact, the clock isn't even on the display.
-The A/C seems to be blowing just hot air.
-The lights won't turn on.

The car drives fine, but all of this happened all of a sudden. I was wondering if anyone else had a similar issue to this and found out what the problem could be before I take it to a mechanic.
Thank you for any help you might have.

On the dic, there is a step you can do to check if it's set up in the program to see if your locks are engaging. Press and hold the reset button for about 6 seconds or so with car running. It should appear on the digital readout to walk you through some steps and will eventually say something like auto door locks, on or off. This step will also be in your owners manual.

 

[Pwr_Commander]

*Fixed*
Unplugged both battery connectors, let sit for around 6 minutes, then connected it all back up and everything worked. Even the key fob, everything.

And yes Frampton, the car was low on freon and now it blows cold yet again.
Thank you for all the helpful suggestions!!

 

[SAYBER]

*Fixed*
Unplugged both battery connectors, let sit for around 6 minutes, then connected it all back up and everything worked. Even the key fob, everything.

And yes Frampton, the car was low on freon and now it blows cold yet again.
Thank you for all the helpful suggestions!!

Great!