Have you pressed both buttons and once and held them in for 2 seconds? I didn't see that mentioned anywhere in the thread. Sometimes the pairing gets lost. Not the coding, the pairing. A bit like your phone and a Bluetooth speaker. On the TVSS system, holding both buttons used to get them talking again.
I think we have tried most everything now, it looks like either there was never an alarm fitted, as what I can gather from the interweb, alarms were fitted in the UK by Toyota UK not in the factory in Japan, or someone has disconnected your alam because it became a nuisance by sounding for no reason, there a few threads on ih8mud about how some in the US have removed their alarms from 2001 LC 100's.
The only other thing I can suggest is to either find the alarm module or to not find the module to prove either way.
Good Luck, let us know if there are any developments.
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