Serial Number Display Mode

To obtain the audio unit serial number on a vehicle, do the following:

NOTE: This procedure can only be performed when the battery power is disconnected from the audio unit and the audio unit displays "CODE".

Turn the ignition switch to ON (II). The audio unit must be OFF at this time.
Press and hold the Preset 1 and Preset 6 buttons. While holding the buttons, push the VOL PUSH PWR knob to ON.
The display will show a U and the first four digits serial number. After five seconds, the display then changes to a L and the last four digits serial number.
Use all 8 numbers as the serial number when using the iN (Interactive Network) to retrieve the 5 digit anti-theft code.
The serial number output mode ends when you turn the audio unit off, or turn the ignition switch to LOCK (0).