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The OBD port should be outputting CAN signals if your reader tools are able to do that; or, there’s supposedly a direct CAN tap behind the radio if that’s preferable (in case you want to get an alternate diagnostics tap). The gen1 seem to respond to Toyota CAN/OBD protocols for extended access to various things. It’s possible the OBD port needs to be replaced; check the official service manual for the procedure to test that it’s electrically functioning, perhaps?
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