According to the diagram in the Haynes manual, all the info to the cluster goes through the Instrument Interface Module, which, also according the the Haynes manual, is located under the driver's side of the dash. Granted, this is the Haynes manual and I am by no means an electronics genius, but this appears to be the only other place, besides the cluster itself, that these otherwise unrelated systems are connected. I had the same problem about a year ago. It happened 10-12 times and then went away. I never bothered looking for the IIM after that, but I know someone on this board has. That could be another place to start.
