Hi, welcome to the forum!
There are two spots in the 7th Gen Celica that I am tracking where the key-less entree have been installed in the United States Models
There is a location in the panel behind the driver seat where they were installed for that that did not have the alarm system.
it was closer to where the top of the rear seats meets the back pillar behind the plastic trim.
Edit: I mean the security system when I stated "did not have an alarm system"
The other location is behind the knee board plastic trim. This location was used for a lot of Celica's that used an alarm system,
because it was an easy location to install the plastic box that held the alarm/keyless entree system.
under the knee board for the driver side there should be a wire plug for the a plug and play VIP Security system. if its not directly under the knee board, check in the drivers left kick board/ plastic trim to the left of where your left foot rests.
I had ran all over the place trying to figure out how to get my 2000 Celica GT keyless entree and those were the locations I found.
Last edited by Zaon_Prime; Oct 1, 2019 2:42pm.