2001 bmw 525i .power seats and steerind column adjustments wont work.tested power suply and its like 5watts.checked fuse..its good but only bout 5 amps there too

Kindly check this site.
Interior Fuse Box Location 1997 2003 BMW 525i 2001 BMW 525i 2 5L 6 Cyl...

Front power distribution box is located in the left-hand rear corner of the engine compartment.
Fuse # 1 instrument cluster check control. Check fuses #4 ,5 &20. There is also a panel under the rear seat . Good luck.

Try under the back seat.

My bmw dealer said that the Mass Air Flow Sensor needed to be replaced. The car would not run. It will start, idle. upon excelleration it chokes and dies. The "check engine" light is on. I disconnected the MAS and the car runs fantastic. SOOOO, I ordered a MAS and installed it. Reconnected the unit and the same problem occured. Is there a fuse relay under the hood or back seat that I can replace?
Thanks
Gordon

Sounds like the fuse has blown. On these 5 series a single fuse controls both the steering colomn adjustment as well as the drivers seat adjustment.

In your glove box, either behind a panel or a drop down fuse fascia is fitted. The fuse your after is a 30a fuse in position 13. Normally a sheet with a labelled diagram will show you where fuse 13 is located. (Or just simply from left to right count 13 spaces!)

Hope this helps!

not really but, it can be modified if nothing is binding the seat travel.
Almost all cars use 4 bolts to hold the seat to the floor boards. You maybe able to drill a new set of holes to move the seat back as required.  Remember to use lock washers and tighten the nuts tight as you don't want the seat to wobble.  Also some cars the pedal set adjustable in position 

have you checked the fuse?

getting access to the horns takes time hut check the wires going to the horn and check for voltage

i have all the info you need..had to do this on my brothers care...short answer is the cables stretch inside their housings.. once seat is removed you trim the casing around the cables 1/4 and reinstall the end caps on each one to make them match their paired partner cables..stupidest thing bmw ever did having two cables to control each movement causing the chairs to twist and buckle like that..compare at $1000 to have qualified service do it for you...

The best thing to do is tuen the key on and teat all the fuses with a 12 volt test light. Replace any fuse that test bad.

try checking for a short to power on ur 12 volt comming into motor also check for a good ground at the plug for ur wiper motor