Because I have the 6 spd. roadster, cheaper model, I have a number of fuses missing. 23 is missing and I think this is the one they removed for the short (soundbooster). The rest of them come with the more expensive model (1, 4, 9 12, 13, 21, 22, 24). Number 9 is missing, but I have a horn and I know when I put the car up on jacks for the winter I cannot start the car and an alarm goes off. Number 9 indicates it is for roof light, horn, anti-theft-alarm, trunk light, tire pressure control. gcong