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Hello, thanks for posting
Does the engine turn over but not fire up?
What year Tundra is it and which engine?
Thanks for the reply
Have checked the fuses in the box under the hood?
Are you using the same key that worked before?
Is there any kind of aftermarket security system or any security light on the dash flashing?
What does it look like? Is it the shape of a car or a key? Or just a led light? The security system activated when the battery died and it's keeping it from starting.
Ok, that's the factory sec system, do you have a remote for it?
Ok, close all the doors, use the key to lock unlock five times, I''l be back in a few minutes.
Yes, I also wanted to ask if you put the key in and turn to ON does the light still flash?
Ok, that's good, it means the computer is recognizing the key. Try this, it's kind of a long shot but it may reset the sec system:
With the key out disconnect the negative battery cable
Put the key in and turn to on
reconnect the cable
try to start
if that doesn't work
disconnect the battery for about 30 minutes and retry
If neither works please relist the question without leaving a rating so someone else can help with this, I have to leave for a few hours anyway, good luck, hope you get this resolved.