In most cases it is the BCM, located directly behind the glove box, mounted up high and horizontal. It is metal and looks just like many other GM car computers of the early 80's to mid 90's. In all my experience working on these cars, only once have I seen the problem caused by the Fuel Data panel. The BCM for the 1992 is same as 91-93. The 89 has a different service number.
== == == == I am going through the same problem with a 1989 Deville. I replaced the Fuel Data Center and the Sending unit in the tank and the tank itself. Now I am going to replace the BCM ( body control module) Some times the data center is perfectly normal next time There is just a "d" displayed. Will update you on my next step!
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