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You can still have power door locks without remote capability. Security light, depending on what package it was installed in, could be a dummy lamp. Example, on my Corolla - the security lamp was tied to a flasher unit keyed to the ignition - once ignition was turned off, flasher unit kicked on the lamp. My Corolla has neither keyless entry or an alarm system - but it has power doors and windows.
In order to remotely lock/unlock - you'll need the appropriate "brain" inside the car. Be it in the Toyota VIP alarm system or with their keyless entry system.
Most of them are port side / dealship installed - so you'll have to look around for the control module. Usually places to look are under the seats and up under the dashboard.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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