RS6 Alarm System Failure Signals Immobilizer Risk

Had the same alarm system failure on my A6 3.0T from 2005. The alarm control module was causing false alarm triggers before failing completely. Initially thought it was a battery issue since the central locking also acted up. Main symptoms were identical, complete alarm failure followed by warning lights. The root cause turned out to be corroded wiring connections at the alarm control unit under the rear seat. Water had seeped in through a blocked drain channel. The fix required: Removing rear seat, Replacing the alarm control module, Resealing drainage points, Recoding the new unit to match vehicle This was an extensive repair job requiring specialized diagnostic equipment to properly code the new alarm system components. The immobilizer is on a separate circuit though, so it should continue working normally even with alarm issues. Would strongly recommend having a proper diagnostic scan done first. Unusual false alarms or complete system failure often point to the control module rather than just sensors. The repair needs proper coding equipment, not something for DIY unless very experienced with vehicle electronics.

Thanks for the detailed response. The symptoms you described match exactly what I am experiencing with my RS6. The false alarm situation is particularly concerning since it could leave the car vulnerable. Did you remember roughly what the repair cost came to? My local shop quoted me 800 Euro just for diagnostics and basic fixes, seems steep. Also wondering if youve had any recurring issues since getting it fixed, especially during wet weather given the drainage problems you mentioned? The car alarm reliability is critical since this is my daily driver. Good to hear the immobilizer should be unaffected by the anti-theft system failure though. Will definitely get it properly diagnosed with the right equipment rather than attempting a DIY fix on such a complex security system.

Just got back from having my A6 alarm system properly fixed. The anti-theft system is now working perfectly after replacing the faulty control module and addressing those drainage issues. Total repair cost was much lower than expected, only 45 Euro to replace and code the new alarm control unit with proper optical locking indicator signals. The car security alarm works flawlessly now, even in wet conditions. No more false triggers or warning lights since the repair. The shop used specialized diagnostic tools to ensure the alarm system was correctly coded, which was crucial for proper functionality. The original 800 Euro quote you received does seem quite high. Worth shopping around as prices can vary significantly for alarm system repairs. The key is finding a shop with the right diagnostic equipment to properly code the security components. Going through a qualified mechanic was definitely the right choice rather than attempting DIY repairs on the anti-theft system. These complex alarm configurations need proper diagnostic tools and expertise to fix correctly.

I finally got my car back from the mechanic after dealing with the alarm system problems. Found a different shop that diagnosed and fixed everything for 650 Euro total, much better than the initial 800 Euro quote. The power failure in the alarm control unit turned out to be the main culprit. The mechanic showed me where water had been leaking into the control module. They replaced the unit, resealed all the drainage points, and recoded the entire system. The car alarm and immobilizer are now working perfectly. No more unusual triggers or battery issues. Really glad I chose a specialized shop with proper diagnostic equipment. They thoroughly tested the anti-theft system in different conditions before returning the car. The repair took two days but was worth the wait for a proper fix. Will definitely keep an eye on those drain channels during the rainy season to prevent future water damage. For anyone facing similar alarm control problems, spend time finding a qualified shop with the right diagnostic tools. The extra research saved me both money and future headaches.