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Would you be able to capture a noise clip of this, I no its random so it may be kind of hard.
Is there any aftermarket accessories in this Tundra, remote start, security, navigation, event a power supply inverter?
Two things I would suspect.First would be the door adjar indicator, this would also produce a door ajar light but it may be happening to fast for you to see but your able to here it, you can try cracking door open while driving to see if that's the same noise. Second could be the switch in ignition, this would be the same noise as leaving key in ignition with door open.
Yes the dinging noise for the you ignition indicator, is that the same noise as in pitch?
What is the make/model of your inverter?