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E36 (1991 - 1999)
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  #1  
Old 02-27-2008, 03:40 PM
alexe34 alexe34 is offline
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Mein Auto: BMW E36 325i
Question Electric mirror fuse blowing

Hi,
I have a 1992 E36 325i with electric mirrors. The electric mirror fuse keeps blowing, about half an hour after I replace it. I have tried using slightly more powerful fuses and they all blow as well.

What could be causing this? how can I fix it?

Alex

p.s. none of the other fuses blow, only the electric mirror one...
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  #2  
Old 02-27-2008, 04:15 PM
Mary99 Mary99 is offline
 
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Fuses are current limiting devices. Any device, operating normally, will consume a certain amount of current (Amps). If this device malfunctions or the wires leading to the device is damaged and shorts, the fuse responsible for limiting the current consumption will expire.

The fuse rating (5 Amp, 10 Amp etc..) is calculated to offer the proper protection to the the wiring that supplies power to the device. Replacing a fuse with a larger rated fuse will negate the function of the fuse and use the wiring as the fuse. Ultimately, when upgrading the capacity of a fuse ignorantly, you stand to set your bundle of wire on fire.

Quote:
Originally Posted by alexe34 View Post
.......The electric mirror fuse keeps blowing, about half an hour after I replace it. ....
Does the fuse expire immediately if you manipulate the mirrors with the mirror control?

Does the fuse expire even if you don't use the mirror control?

Did this problem suddenly occur or did you inherit this problem when you bought the car? If it suddenly occurred, was any work performed on the car prior to this incident?
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  #3  
Old 02-27-2008, 05:01 PM
alexe34 alexe34 is offline
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Mein Auto: BMW E36 325i
thanks,
yeah, i realised what might happen if upped the amp fuses.

the control works for about half an hour and then stops working. it didn't always happen, just started happening recently and have had no work done on it. the fuse will blow even if i don't use the control...
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  #4  
Old 02-27-2008, 05:30 PM
Mary99 Mary99 is offline
 
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Quote:
Originally Posted by alexe34 View Post
.....the control works for about half an hour and then stops working. it didn't always happen, just started happening recently and have had no work done on it. the fuse will blow even if i don't use the control...
You have a short somewhere that is causing the fuse to finally expire due to constant heating of the fuse.

Firstly identify where the short is....is it before the control or after the control or the control itself? You can do this if you disconnect the harness to the control. If after disconnecting the control and the fuse still expires, then the short is in the wiring from the fuse to the control. If after disconnecting the control and the fuse behaves normally, then the short is in the control or the after the control.

If the short is not in the wiring leading up to the control, test the control itself. Leave the harness plugged into the control and disconnect the harness right before the mirrors (both sides). If the short exists, it's either in the wiring from the control to the mirrors or the control itself.

If the short is not in the wiring leading up to the mirrors, test the mirrors themselves. Disconnect one mirror at a time and identify which mirror is shorting.

Disconnecting the harness one after another, all the way up to the mirror itself, will identify the area that is shorting. Once you identify the shorting area, identify the actual short. If it's a short in the wires, you'll see the damaged wire. You can also identify the individual wire that is shorting by using a VOM.

Post your results if you need further advice from the community.

Last edited by Mary99; 02-27-2008 at 05:36 PM.
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  #5  
Old 06-15-2008, 04:02 PM
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Talon328 Talon328 is offline
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I also have this problem. I'll test it soon and let you know what I find.
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  #6  
Old 01-02-2020, 07:25 AM
Wrenchorama Wrenchorama is offline
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I have the same problem, keep us posted If you fixed it
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