How to find the serial number or pre-code
The serial number or pre-code is needed to retrieve your radio code. To find it, turn the unit ON and hold the buttons 1 and 5 for a few seconds. The pre-code should be visible on the screen. It always starts for a letter fallowed by three digits. Example: S120
If the method 1 doesn't work for you, there is another way to find the pre-code. Using two thin screwdrivers or the removal tools, extract the radio from the center console. There is a sticker on the unit case with the pre-code or serial number.