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I may be able to help you with this. Follow what I am posting and then post the numbers you get here.
1. Turn the ignition switch to ON (II).
2. Turn on the audio unit, and make sure you see COdE in the display. If you don’t see this message, remove the backup fuse for 1 minute, then go back to step 1.
3. Turn off the audio unit.
4. Press and hold the 1 and 6 preset buttons, then turn on the audio unit. The display toggles between two screens. The first screen displays a U and the first four digits of the serial number (for example, U2200). The second screen displays an L and the last four digits of the serial number (for example, L0055). Ignore the U and L, and write down all eight digits.