I have a similiar problem.
Have done extensive troubleshooting of wiring and OBS code scan that showed DTR's 600 and 720 Output speed sensor & serial link communication malfunction respectively - They brake down to numerius rerror codes.
Basically to date found the Body Control Module had failed for the spoiler problem. Replaced it but still have a motor limit switch problem.
My light problem also include a Brake wear and Brake light waring. All of which is controlled by the Controller anti-lock brake modual. Both my rear wheel speed sensors had failed. Replace them but cannot reset the codes that continue to lock in the lights. The manual implies I need nave the dealer only DRBIII scanner (Mercedes System).
In talking to Chrysler dealers there is limited experience with the Xfire and in some cases they don't want to touch the car. Dealer want $90. Per hour plus scan of $90 and the manual T/S process can require extensive hours.
My problem happened just after I had crossed my drive way Curb that I fairly high. The car did not bottom as I remember. The Spoiler went up and the lites came on. I manually lowered it and shut the car down. When I restarted The lites came back on and the spoiler went up and stayed up. Could not control it manually. Up as is a fail safe mode the computer drives it in case the motor fails and you can access it.
I suspect though I am not done troubleshooting the CAB is bad. List price is $800+ but can purchase thru MOPAR warehouse ate $680.
Will update as I go further.
Thursday, March 4th, 2010 AT 10:24 AM