Should be 6.
In German
http://www.motor-talk.de/forum/aktio...hmentId=598725
The repair document number for the relay: 12 21 500
I have both hard copies in English. Will try and scan.
There is way test which plugs need replacing.
I don't believe all 6 will go out at the same time.
First check the fuses and for power at the glower plugs.
PM me if you have questions.