I have same problem on 1994 525i. Need a new control module which no one seems to have.
replace the light module
2005 BMW 525i parking light bulb lamp replacement: Purchase the correct replacement parking light bulb(s) first, before disassembling the vehicle. See sources and related links below for replacement bulb information. Then consult your owner's manual for the parking light bulb lamp replacement procedure. As simple as it sounds, the owner's manual is the best place to start for bulb replacement instructions and illustrations. You may want to consider replacing both left and right at the same time in order to keep brightness and color equal (optional).
The brake lights on a 2001 BMW 525i are replaced by removing the retaining screws, pulling the light assembly from the vehicle, and disconnecting the bulb. A new bulb is then put in place and reassembled.
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under back seat
I had the same problem on a 1994 525i. Replace the radiator.
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1992 BMW 325i