Electrical problem
1991 BMW 525 6 cyl Two Wheel Drive Automatic 150000 miles
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Recently, the cars electrical system shut down. The central locking system, the windows, seat adjustments, interior lights and the radio quit operating. The A/C, driving lights & ignition remained operative.

Removing the electrical modules in the engine compartment & re-seating them reset the system. Then the same issue recurred. Re-seating the modules did not resolve this the second time. Only when the modules under the rear seat were removed and re-installed did the systems start again.

The general and lamp control modules are possibly faulty due to loose solder traces on the inputs to the edge connectors. Call (619)444-2290 and talk to Autobahn dismantlers. John or Sean will fix you up.