Greetings. I have a Siemens/ vdo cdr 500 (e) in a 2004 Vauxhall Zafira. The code supplied did work. 330886636 no. 24 469 302. Made in Czech Republic. Serial number GM50032097703. I was sceptical as lots of chatter on the internet suggested that the code look up tables people have for those Siemens units might be corrupted and / or the unit might have to be sent off to have the eprom read to get the number. I was happy when I punched the provided code in and it started working. Good job folks. It could be that I was just lucky, but I can certainly live with that......