1991 BMW 525i Electrical Problem

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, outside mirrors, 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.

Any idea as to which module is defective?

check your and replace the relay under the back seat

-those connectors that you disconnected could be dirty or loose

i recently had a simular problem with my wipers, seats,windows and doorlocks all going out on my 1990 bmw 525i E34....i checc
ked everything and finally checked a small rubber compartment right behind the battery where the positive cable leads into it....theres a thin metal piece of connector between the cables check it real good..coud be cracked or broke.....solved all my problems at once:runaround: