If you remove the plastic cover, and resolder the cold joints it may work again. Norm in FL

Not mutch to solder here : http://hem.bredband.net/dimtri/images/spool.jpg

This module looks fine...

I have the same problem with my 2000 E320 and it happened a few times now. It started after a few trial of taking out and re-insert the key. Is the relay problem the only casuse of this problem? How much is the relay?

Dimmi, If you look on the other side of the green ckt. board. You may need an eye loop to see, there are some solder connections that do not make a conn. Norm in FL

When you say "the same problem" to you mean that the starter motor DOES NOT turn ? Becuse if it does, I understand that there might be an issue with the CRANKSHAF POSISTION SENSOR (several threads on that issue).
Regarding the price of this module - I will check on Monday. However, I reside in Sweden! In addition, I am not sure that your model has the same relay (bear in mind that my car is a 1996…)

Frankly speaking, I will not attempt any soldering projects on this module (even thought I got masters in electrical engineering ).
I will rather purchase a new module and hope that this is the issue. However, since this problem only occurs occasionally it will take some time before I can be confident that I have found resolution.

Nevertheless, I will keep you posted...

The price on this module is 1200 SEK in other words approximately 170 $. The funny thing is that you have to return my old one to get a new one…

I paid for the module $200.00 last January.