Without the HDS
WARNING: This page is about a different car, the 2008 Acura TL and 2007 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.
Make sure you have the anti-theft codes for the audio system and the navigation system (if equipped). Make sure the ignition switch is OFF. Disconnect the negative battery cable for at least 30 seconds. After reconnecting the battery, enter the anti-theft codes for the audio system and the navigation system, then set the clock (on vehicles without navigation).