I've ordered one today. I think the security system itself is what would need to be changed for 2 button operation. I think the remote just sends a signal out and the module just unlocks or locks the car based the current status (ie if it is locked when it receives the signal then it unlocks, and vice versa) I'll report back when i get it.
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2007 GS 450h-Active Stabilizer/Radar cruise
1994 L Blue 3.70 VTD
ASE Master Automobile
ASE Advanced Level Specialist
Toyota Master Diagnostic Technician (former life)
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