After a long road trip I locked up my 2000 rx with the key to also roll up the windows. After several hours I went to get my luggage and used the key to unlock the tailgate manually, I unexpectedly heard a horn chirp when I turned to unlock. Unsure if this was correct or if I was hearing things... I tried to replicate it, but couldn’t. My fiancé also stated they thought the same thing happened at he grocery store, but again couldn’t replicate it after it happens once. I haven’t owned this car long, maybe a month, and it’s been noticed 2-3 times, but not consistently, just curious if anyone else has noticed this?

I’m not sure if mine being a 2000 would differ much from your 01, so it’s interesting yours flashes and chirps the horn with consistency. Mine has never flashed the lights when unlocking the tailgate manually with the key, nor do they flash when manually unlocking/locking the front doors with the key, let alone ever hearing a horn chirp on a regular basis. I generally use my remote, and always lock my car even in the garage, so it’s never, ever left unlocked. I’ve only experience feedback (beeps and lights) when using the remote, expect when an actuator went out, which was fixed, and back to normal now. Ive tried different scenarios to replicate the situation, such as locking driver side with the key manually, as well as with the remote then tried manually unlocking the tailgate without being able to replicate the short horn chirp again which happens as soon as I turn the tail lock to the unlock position, so I’m super confused. Although this isn’t a huge deal to me, I feel bothered, and a bit ocd about the inconsistency, or potential problems this may be hinting at. I’ve checked the owners manual, and see nothing about a horn chirp even being mentioned. I suppose I could have an issue with my locking mechanism, another actuator, or even the alarm system, if in fact this its supposed to be flashing lights, and/or chirping the horn. The locking system seems to works fine, and I recently tested the alarm which functions as it should, so I see no issues with the system, minus the random chirp from the lift gate...Thanks again for the reads and replies in advance, I’d love to figure this out 👍🏼