How to disable or bypass MKIII Anti-Theft device?

Bru · 11-17-2023, 01:07 PM

This was one of the first things I had to fix on my '87 Supra 27 years ago. It involves taking out the lock cylinder. Underneath the electrical plastic wheather cover there is a quarter moon shaped piece of copper that becomes detached from the plastic rivet locating pin. In other words when you turn the key the copper quarter moon shaped piece doesn't move so the alarm is not disarmed. Repair by carefully doming over the protruding white plastic locating pin through the copper quarter moon shaped piece to retain it. There's not much of the soft plastic to work with so use something like the tip of something blunt slightly larger, but don't over do it or you will have to get another lock cylinder. Reassemble and it should work after that. If you need a description of how to get the door card off and lock cylinder, let me know.

11-17-2023, 01:07 PM	#3
Bru Bone Stock w Upgrades ;-) Join Date: Apr 2010 Location: Tampa Bay Posts: 202	Alarm sounds when opening the door. This was one of the first things I had to fix on my '87 Supra 27 years ago. It involves taking out the lock cylinder. Underneath the electrical plastic wheather cover there is a quarter moon shaped piece of copper that becomes detached from the plastic rivet locating pin. In other words when you turn the key the copper quarter moon shaped piece doesn't move so the alarm is not disarmed. Repair by carefully doming over the protruding white plastic locating pin through the copper quarter moon shaped piece to retain it. There's not much of the soft plastic to work with so use something like the tip of something blunt slightly larger, but don't over do it or you will have to get another lock cylinder. Reassemble and it should work after that. If you need a description of how to get the door card off and lock cylinder, let me know.