I have a Vitz car with an NDDN W58 audio unit. Recently, after removing the car battery, the unit became locked. Here’s how I managed to reboot and unlock it.

Required Files

Steps to Unlock

  1. Burn the Map disk to a CD and insert it into the audio unit.

  2. Press and hold the confirmation button (shown below) while turning the parking lights ON/OFF three times.

NDDN W58 Confirmation Button

  1. You will see this screen:

NDDN W58 Menu

  1. Navigate to the ERC menu:

NDDN W58 ERC Menu

NDDN W58 ERC Screen

  1. Open the ERC decoder on a Windows machine:

NDDN W58 ERC Decoder

  1. Enter the ERC code and press ‘Done’:

NDDN W58 Final Step

  1. The unit will complete the booting process and eject the disk automatically.

That’s it! The audio unit should now be working perfectly. If you have any questions, feel free to reach out.