Identify Ticking Switch

[Tango22]

I have a 2005 4runner 4WD. Periodically while I am driving I can hear what sounds like a switch ticking fairly loudly under the dash near the glove box. It only lasts less than a minute and goes away. It is infrequent, maybe 3 week intervals. Have never heard it activate with truck running in driveway. Only while driving. It comes on then goes off.

Any ideal what switch that could be? Haven't noticed any effect on anything else. Maybe switch is going out or loose. Appreciate assistance.