Originally Posted by
CaughtInaXF
Reply from SOS
We have helped many Crossfire owners, however, we have to say up front that Crossfire immobilizer faults are nearly impossible to diagnose in many instances. Due to the limited abilities of the dealer tool, there is no diagnostic information available for the immobilizer system.
If the fault is only in the hardware, and all software is intact, the charge for a refurbished module is $485. The charges include programming and a 1 year exchange warranty against defective parts. You can generally expect a 2 business day turnaround time for this service.
Parts needed:
Immobilizer module
ECM (engine computer)
Keys
Shipping forms
So there it is, if you want the new or an replacement SKREEM programmed you need to send all your junk to them...whew!
If yours fails it looks like a week before you will have a working car.
And have to pull the ECM and Immobilizer, guess you won't be using the key so might as well send it. 
Also ala_xfire has the fix for the dead siren batteries replacement, may still be easier to replace the unit @ $150 bucks that way your sure to have a new circuit board and updated chirp alarm. But if you want to try to tackle the battery replacement I say go for it, what can it hurt
Here is Raodster Guys replacement guide,
https://www.crossfireforum.org/forum...tml#post791593
Battery replacement
https://www.crossfireforum.org/forum...rm-module.html
or PDF,
https://www.crossfireforum.org/forum...save-money.pdf
Cheers!
Originally Posted by
onehundred80
That price is a bit high compared to the info in this old post of mine. Like $300 + high.
CLICK
You are absolutely correct. If you know your SKREEM is bad and you can get one in a decent amount of time from a local dealer or supplier like Needs Wings, that is what we would recommend. No programming is needed. SOS services include diagnostics and verification of repair. Also, keys and modules on these cars and the older Mercedes are becoming hard to come by, so we can often repair the original modules or supply a replacement. The above posted prices are incorrect. Please get pricing direct for sosdiagnostics. SOS Diagnostics has been able to help many Crossfire owners of whom the dealer told them they needed a new SKREEM and then they got it and had the same start-die issue. We have the same issue with Dodge Sprinters. So having all the modules present for testing means SOS can confirm the fault before ordering parts (if they are even needed). I know this is an older post, but it keeps coming up with Crossfire owners, so I wanted to address it.