fuse 75 76

can someone please tell me where to find fuse 75 and 76 please for my 520

Search the site as this has been discussed several times. I believe it can be found behind the glove box in various models. Sorry; not sure about yours.

They are listed on the card that is in the glovebox on e39s imported to the USA. If they are not in that grouping..then they may be next to the GM and other electronic components on the firewall BEHIND the glovebox.

I'm not sure where Hull is located...but if your car is left hand drive....then it should be easy to find. If you are in a right hand drive car...the fuses up front are accessed differently (see your owners manual) and fuse 75/76 may be accessed from the engine bay. Again, I'm not sure how your car is set-up...and we didn't get the e39 520i here in the States.

Good luck

(fuses up front in the glovebox)

What a trip.

Auxilary fan or heater fan just kept running when my wife and I picked up my mother to take her to dinner to a restaurant in Plains, Va. That was around 4 pm. When we got to the restaurant and turned off the car, the fan just kept running.

Unfortunately, it was July 3 and after 3 pm -- I couldn't reach my independent BMW service -- Fairfax Service Center. Went in to eat and when we came out, the fan was still running with the car off.

Was planning on heading to a movie but decided that I better take care of this problem first. Got back to my mother's house, checked Internet and bimmerfest and found out that the heater or auxiliary fan running uncontrollably during driving and staying on after turning the car off occurs on occasion. Also, found out where the fuses were in the glove box -- along with the fuse listing but no fuse 75 and 76 in glove box.

When I got home around 8:30 pm, checked Internet again and found out that some could never locate it. Others said that it was in the glove box.

Well, it is not in the glove box as noted here. Rather, close the glove box and behind the glove box is a plastic panel with a hole in it (the panel is directly behind the glove box) Pull it towards you. Takes a bit of a nudge.

Then there are all kinds of wires bound together and various connectors that if you pull out will probably incapacitate the car -- who knows. I had to contort myself to lay on my back and look up in the well on the passenger side.

Yes, the two large fuses -- 75 and 76 are in the middle of this mess, and yes, it is a tight fit (took forever to locate them with the little flash light; some say they are obvious but they weren't to me; of course, now I know exactly where to look). God knows how one gets them in. To get the fuses out, I had to nudge the first fuse on each side -- couple of sparks -- God knows what those shorts did -- and finally it came out -- the fan stopped. Before, I pulled the fuse out completely, I nudged it back in and the fan started up again. Then pulled the fuse all the way out and left the other fuse in.

Checked to see that the car started up OK -- it did -- no fan or air conditioning that blew out of course.

Will take it in on Tuesday after the holiday. Hopefully, it is just a resistor as some have found. Didn't want to leave it running all night and drain the battery or -- who knows -- cause a fire (tending to the melodramatic.
Also, didn't want to drive it to the service center and leave it -- after disconnecting the battery (didn't know if this was a good idea with the fan running; manual says don't disconnect battery if car is running.

Will definitely get BMW dealer or independent service center to show me where all the fuses are in my other car -- a 335i.

Originally Posted by rog5878

....Auxilary fan or heater fan just kept running when my wife and I picked up my mother to take her to dinner to a restaurant in Plains, Va. That was around 4 pm. When we got to the restaurant and turned off the car, the fan just kept running....

Check the diagram but in your car, the control of the fan is from the DME.

Very likely it is the temp sensor (located in the lower radiator hose) that is defective:



Temp Sensor is #12 here:
http://www.realoem.com/bmw/showparts...67&hg=11&fg=35

CN90,

Your diagnostic advice is greatly appreciated.

Originally Posted by rog5878

What a trip.

Auxilary fan or heater fan just kept running when my wife and I picked up my mother ...

Which fan is running...the aux fan...or the heater blower? These are two different fans in two diffent locations...used for two different things?

The aux fan is the one in front of the radiator which helps facilitates cooling when engine coolant temps get to a specific degree...and when the AC is initiated etc. The heater blower controls the air velocity for the cabin/interior HVAC system. Which fan is running after the car is shut down?

BTW, when the manual says to not disconnect the battery while the car is running...that refers to the engine. When you shut the car off...but your heater blower fan or aux fan is still running...the car is off & the engine is not running...you can disconnect the battery at this point because the engine is NOT running.

QSilver7,

I read rog5878's post. It's his HVAC blower, no doubt the FSU.

Cn90
Very useful electrical diagram!
Thanks

Originally Posted by rog5878

CN90,

Your diagnostic advice is greatly appreciated.

Oh, I just read QSilver post. May be your problem is the "FSR".
There is a DIY in the forum, very very very easy to do, don't pay the dealer for that.

Next time is happens, as a temporary measure, simply use a 10-mm wrench to disconnect the battery ground so it does not drain the battery, no need to lay on your back to pull Fuses 75/76.
Just re-connect thebattery ground when you go somewhere.

For the FSR, Use BMW OEM part only, the aftermarket parts have high failure rates, even brand new out of the box. So stick to BMW OEM.

QSilver7 is correct. It is the heater blower.
After I thought about it, the fan that was blowing when the car was shut off was not near the radiator but was close to the front windshield.

Thanks for the advice re: battery.

Will check out DIY in forum.

Thanks again

Today, in another auxiliary fan related thread:
- Auxiliary fan stays on after shut off

The OP opined that a new car battery should be able to handle the auxiliary fan running overnight.

I have no idea what current the auxiliary fan uses; so I ask here what you think it uses?

For the purpose of that thread, I took half the value of the fuse #75, which, in QSilver7's post above, is 50 amps divided by 2 = 25 amps.

So, over a ten-hour period, if my assumption is anywhere near close, the auxiliary fan will cause the (new) battery to source 250 amp hours.

Does this seem like a reasonable calculation for the current draw of the E39 auxiliary fan that is constantly running?

(I do realize that motors draw current mostly in the starting phase, hence the dimming of the lights with the washing machine ... so maybe the unloaded current draw is vastly less?)

97 528i, my aux fan isnt kicking on either, i checked the fuse

and it wasnt blown, but notice the discoloration on the blades? might that be part of the problem? or should i statr trying to test the fan itself?

and on a different note, my fuse 76 wasnt right next to 75, is it supposed to be? or do i just not have it?

Originally Posted by crazyb0064

97 528i, my aux fan isnt kicking on either, i checked the fuse
and it wasnt blown, but notice the discoloration on the blades? might that be part of the problem? or should i statr trying to test the fan itself?

and on a different note, my fuse 76 wasnt right next to 75, is it supposed to be? or do i just not have it?

I would test aux fan and see if when you jump the wires...does the fan turn on at high speed. If it does, then more than likely the inline resistor has failed. Most times this is the issue with a failed aux fan of your production build. (there are multiple aux fan set-ups...so you can't follow just any instructions you see...always look at the model year/build date of the DIY you're reading to make sure it applies to your situation).


Again, look thru the DIYs for the aux fan for e39s/e38s that were built BEFORE 9/98...and see how they dealt with the issues with their failed aux fans...and compare/test your aux fan for similarities.

(#8 is the resistor...that causes issues with the early aux fans)

i will check it when i get home tonight, been looking into it the past couple days, just dont have much time between work and kids.

does any one know what 19 does? its on the charts, and there is a fuse... but no description...

Originally Posted by rcatank

does any one know what 19 does? its on the charts, and there is a fuse... but no description...

My #19 (5A, light brown) fuse slot is empty:
- Where to find E39 fuse boxes (1)

Originally Posted by rcatank

does any one know what 19 does? its on the charts, and there is a fuse... but no description...

If you are referring to the chart below...F19 is a 5 amp fuse that is in-between the ignition switch and an unloader relay terminal 15. If the space is empty on your car...then it is not required. Here's a link to the online WDS that shows what is in-line with F19:

link to WDS Fuse 19: http://wds.spaghetticoder.org/en/svg...10.svg?m=e3902

(you may need to "click & hold" your cursor to move the diagram (at the link above) up/down/left/right to see everything...or you may have to use another keyboard short-cut to enlarge or decrease the diagram so that you can read it...check your VIEW pull down for keyboard short-cuts to ZOOM-IN or ZOOM-OUT)

K93 = terminal 15 relay location in trunk

Depending on the e39 model and year and market, these fuse 75 and 76 locations seem to move around a bit.

I Googled some pics. In some models, these fuses are located to the side of the connector housing with the general module etc (all tucked behind the glove box).

I include a couple shots [see attachments] of such an arrangement, from a right-hand drive car I believe.... http://forum.bmw5.co.uk/topic/29533-...the-tech-guys/

Also found an arrangement where the GM connector housing could be tilted downward for easier access to all that stuff, but lost the link. I haven't seen it again, maybe a figment of my imagination?

I went with the assumption I'd find the fuses to the side when looking for my setup and couldn't spot anything similar. I finally found the fuses in my car after looking at a photo in SleekBMW's auxiliary fan write-up here on the 'fest.



That's a single, square socket housing for two large fuses, unlike the individual socket arrangements shown in the attached photos. And yeah .... it's hard to get your hand up in there (be sure to disconnect the battery first), let alone finagle the fuses upward and out with your fingers. Be sure to put the right fuse back into the right slot, too. Easily interchangeable.....

Originally Posted by crazyb0064

my fuse 76 wasnt right next to 75, is it supposed to be? or do i just not have it?

I just removed my yellow 40amp fuse F76 and it was right next to the red fuse 50 amp F75.

See gory details in this thread today:
- Detailed step by step diagnostic DIY ... dead battery ... parasitic current drain

See how to remove the diabolical GM3 connector hindering access to fuse F75 & F76:
- What is the secret to removing the diabolical connectors hindering access to Fuse 76