Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!
Please follow the links below to help get you started!
I have a 1990 525i BMW that is drawing anywhere from 199-200mA on the battery while the engine is off. According to statistics anything less than 35mA is acceptable. I recently purchased a new battery and have the alternator tested out good. The current dropped to 23-33mA while having an ammeter in series with the battery, and immediately after the removal of fuse # 30 (7.5 Amps) which is located under the passenger seat behind the driver's seat in the rear distribution box. Fuse # 30 powered up the driver's lock switch and motor, and the A5 relay module. Leaving fuse # 30 in fuse compartment and having the A5 module removed the current dropped to anywhere from 18-23mA.
I think the problem is in the A5 module, but not sure. The rear passenger door behind the diver's seat is inoperable due to failure to open and front passenger door will not unlock when key is in lock. I also benched tested the A5 by manually breaking and making relay contacts with ohm (continuity ringing sound) meter. All relays seems to be fine and no unusual burn spot or discoloration on circuit board or component observe. In addition to testing, all terminal points are checked and cleaned. I feel as if I can't do anything else with it due to the fact that I have no wiring or schematic representation of this relay module.
Do you have any advise that you would love to share with me or a solution to the problem ?. If so I would surely appreciate and show my generosity.
My 1990 525i defogger failed to defrost rear window . I think the problem could be a faulty rear defogger relay (k13). Does anyone knows where could I find this relay circuit or what location of the car is it in?