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I have no idea how JDM models work. Here's a bit on the US models and see if it helps
Almost all Japanese cars use a negative trigger.
The US SVX has two relays in the door lock timer module located behind the glove compartment (probably what you hear). The two relays are used because locking/unlocking the driver's door triggers the lock for the passenger door, but the converse is not true.
Central locking for this style of door locks usually (in the US) involves the installation of a couple diodes, and is relatively easy to hook up.
Attached is a diagram and a wiring for a US model, with a US alarm. Hope it helps.
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