Toyota tundra ac light switch keeps blinking

Question edited for clarity.
Question moved to model category.

With mine I just turned the AC off, counted to 10 and switched it back on.

Blinking light means that the unit is trying to engage.
I've read that if the light is blinking and won't go out on it's own during engaging or disengaging, you can go underneath and tap the selonoid

check to see if the release of the parking brake actually engages the warning light switch fully.

Have you checked the gear position sensor? That would be my first place to start.

Well, check if you have brake lights to start with? If you dont have brake lights, it is possibly a brake light switch under the brake pedal or a stop fuse blown. ( with brake switch malfunctioning, this could set ur check engine light and also ur brake and abs light. Check this and get back to me. By the sounds of the other accessories not working, check your 10 amp guage fuse which i am not quite sure, could be under the hood or in the cabin. keep me updated.

Seeing as how you go to a dealer vs: a repair
shop,take it back to the dealer

What else can you do?

You can not resolve yourself without factory service
& diagnostic manuals,you could purchase them

4 wheel drive does not engage on a 2004 toyota tundra

Its possible the 4wd actuator on the transfer case is sticking from lack of use. Its a black plastic part located on your transfer case on the drivers side rear with a electrical connector attached. Tap on it lightly while someone activates the 4wd button. Have truck running in neutral with foot on brake. (dont get run over). If it goes into 4wd, then just remember to cycle it into 4wd and back again once or twice a month to keep it from sticking.
If all this doesn't work a dealer will need to look at it.

The light blinks to alert you that a problem exists in the control module for the 4X4, contact expert Toyota Ed he is the service manager of a Toyota dealer, he knows his stuff