2:17 a.m., truck stop lot, 2018 Accord lockout — every time I stepped in, the horn blasted and the immobilizer lit up like a warning beacon… Spare fob was stuffed in a chip bag as a DIY Faraday and the RF bounce had the car confused. Got them in and re-synced the fob; anyone else getting heckled by security systems while doing a simple lockout?
Had a 10th-gen Accord do the same, and my fix is the simple “tin can trick”: if I find a spare in the car, I drop it into a stainless cup or metal toolbox and close it before I touch the handle so the LF/RF stays quiet. If it’s sitting right by the console, I slide it to the rear floor first or it still wakes the car. You seeing it trigger more off the driver handle or the trunk sensor?
I carry a cheap RFID sleeve and drop any found fob into it before touching the handle — cleaner and more reliable than the “chip bag Faraday.” @taylor57k, you ever pull the horn fuse first so you’re not conducting a 2 a.m. honk concerto?
Quick fix: I pop the spare fob and lift the coin cell with a thin pick to kill the proximity, then reseat it after the door’s open — faster than chasing Faraday hacks, but go easy on the spring clip; @victorh99, you do this or prefer a pouch?