Acura TLX 2021 Owner's Manual page 120

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Built-in Key
Models without two-way keyless
remote
Release Knob
Built-in Key
Models with two-way keyless
remote
Release Knob
Built-in Key
The built-in key can be used to lock/unlock the
doors when the keyless remote battery
becomes weak and the power door lock/
unlock operation is disabled.
To remove the built-in key, slide the release
knob and then pull out the key. To reinstall
the built-in key, push the built-in key into the
keyless remote until it clicks.
uuLocking and Unlocking the DoorsuKey
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