Immobilizer code is not identified:
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2025 Honda Odyssey, 2024 Honda Odyssey, 2023 Honda Odyssey, 2022 Honda Odyssey, and 2021 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
When turning the vehicle to the ON mode when the immobilizer code has not been identified, the security indicator blink until the OFF (LOCK) mode is selected. Then security indicator will come on for 1 second. The state of the keyless registration and the S-NET line can be checked by doing a SYSTEM CHECK and STATUS LOG with the HDS.