Here's what's under the driver side dash. What I think I'm looking at is the ABS ECU,Relay box and Cruise control ECU. Does any of that look like an anti theft device ?
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The port added "factory" one is under the driver's seat.
There is a "SRS" plug with a light in the dash. Could be left of the steering wheel or next to the hazard button on the dash.
If you find a square module under the seat, pull the seat, then systematically pull the module and trace EACH wire back to a connector. Unplug that set of connectors and replug the now free connectors together.
I had a grey wire that ran across under the dash from the left kick panel to above the glove box. I didn't know where it attached until I removed the console, glove box, and section below the steering wheel Turns out that wire was just an antenna wire for the FOB.
While I had it all apart, I repurposed a hazard switch into a CDL switch, did the Pin 7 Mod, replaced my firewall boot on the steering column. All of this took me about 6 hours taking my time. My CDL switch is now where the alarm light used to be.
What you could also be looking for is a random button or toggle switch that seems NOT factory or is mounted through a kick panel or under the dash. It's an alarm bypass used for valet service. This would all be from an aftermarket alarm added by a PO.
I don;t see anything in your pics specifically denoting anything alarm related, but that's not to say there's not a port added alarm in that harness. It is done very well and is very factory looking.