the daddy of all volvo electrical faults is when the battery gets a low voltage situation even though the car will start and run without problem the low voltage triggers an srs hddd code and cannot be reset even with vida or a dealer software the only way to fix this is to remove the crash module and have a specialist download the info off the eprom chip remove the marker left by the low voltage and then re load the eprom chip with the original info without the code marker this involves striping out a lot of the car to acess the module . ask me how i know. so not all that reliable . the specialist had at least 20 volvo modules in for this service when i was there . so it must be a very common problem..
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