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If this happens when the lamps are actually working, is it likely caused by the LKM module if they are anything like those in the earlier cars. My 1989 735i had this issue for tail lamps and brake lamps, and reading forums revealed this problem can be cured two ways: either disassemble the LKM box and re-solder all the connections to the circuit board (not fun) or replace unit with one from a 1994 or newer model. Sounds as if even the newer models still have the same issue. Replacement LKM's are very pricey, even from salvage yards.
In the dash, there are 2 warning lights associated with the brake system The
first and most important is the Red " BRAKE " light in
the dash.One light has 2 functions. It informs you that the
parking brake is engaged and more importantly it informs you that the hydraulic
brake system reservoir fluid is at a low level. The system uses a wire
schematic that you can see in picture #2. From the #12 fuse, the circuit goes to
the warning light in the instrument cluster. From there it travels via cables to
both circuits in the brake fluid reservoir and then to ground G102 which is
located behind the instrument cluster . The black buttons at the top of the
reservoir are test buttons for the floats in the reservoir.
Your dash light fuse is usually labeled instrument lights or inst. lts. on your fuse panel cover . It is important to note that the instrument light fuse is fed by the brake light fuse . So , make sure your brake lights are working properly first . If your brake light fuse is blown , your instrument lights will not work .
I had the same problem. Abs light would come on and I would lose all dash instruments. Hit a bump on the road and abs light would go off and dash would come back on. What I did to fix problem, lol I slaped the dash just to the right of instrument panel and it all came back to life. There seems to be a short there, and I slaped it back 3 times in a week and now for the last month it has stayed on.