Audio Unit or Audio-Navigation Unit and HDD Replacement Troubleshooting

To protect client information and data from theft, the audio-navigation unit and the HDD have a passcode that prevents the HDD from being accessed by any audio-navigation unit. When the HDD is first installed in an audio-navigation unit, and the vehicle turned to the ON mode, the HDD writes the passcode from the audio-navigation unit to its memory, which is also known as mating. Every time the vehicle turned to the ON mode, the audio-navigation unit and HDD confirm the passcode against the other component. If the audio-navigation unit has a different passcode than the HDD, the audio-navigation unit cannot access the HDD.

When you order a new audio-navigation unit, it arrives able to mate one time to a new or previously mated HDD. When you mate the two components, the new audio-navigation unit overwrites the HDD's original passcode with the new one. If you try to install the HDD back into the original audio-navigation unit, the passcode is different, and the audio-navigation unit cannot mate to the HDD.

When you order a new HDD, it arrives able to mate to a new or a previously mated audio-navigation unit. Once the HDD is mated, it then can only mate with a new audio-navigation unit.

For more information, refer to audio-navigation unit and HDD service precautions. The outline of the audio-navigation unit and the HDD replacement and substitution is shown in the following table.

NOTE: 

• Original units are known-good units that have been mated at least one time, and new units have never been mated.
• You can substitute a mated audio-navigation unit and HDD into another vehicle, but you cannot substitute known-good components individually.

Audio-Navigation Unit	HDD	Result
New	New	OK
Original	New	OK
New	Original	OK
Original	An audio-navigation unit mated to a different HDD	NG
An audio-navigation unit mated to a different HDD	Original	NG