Fuse #77 blows when replaced...with ignition off!

gobbell1 · 06-02-2021, 10:05 PM

I have a 2009 E89 Z4 that recently lost all power to the climate control on the dash.

The culprit is fuse #77 which blows immediately when replaced.

Anyone experience a same/similar issue?

DavesZed · 06-03-2021, 02:07 AM

Fuse 77 also feeds the glovebox light and luggage compartment light, and should be a 10 amp. So a couple of other places to check there as this sounds like a short somewhere.

gobbell1 · 07-19-2021, 02:23 PM

Finally figured out what the issue was.

The glovebox light wiring harness had pulled away from the connectors and the bare wires were touching a metal plate, thus grounding the circuit and blowing fuse 77 all the time.

To see this, I had to remove the front dash panel around the climate control and just happened to see the bare wires staring at me.

06-02-2021, 10:05 PM	#1
gobbell1 Private 14 Rep 58 Posts Drives: 2009 Z4 30Si Join Date: May 2012 Location: Memphis, TN iTrader: (0)	Fuse #77 blows when replaced...with ignition off! I have a 2009 E89 Z4 that recently lost all power to the climate control on the dash. The culprit is fuse #77 which blows immediately when replaced. Anyone experience a same/similar issue?
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06-03-2021, 02:07 AM	#2
DavesZed Lieutenant 144 Rep 509 Posts Drives: BMW E89 23i, 2011 Join Date: Nov 2015 Location: Grantham, UK iTrader: (0)	Fuse 77 also feeds the glovebox light and luggage compartment light, and should be a 10 amp. So a couple of other places to check there as this sounds like a short somewhere.
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07-19-2021, 02:23 PM	#3
gobbell1 Private 14 Rep 58 Posts Drives: 2009 Z4 30Si Join Date: May 2012 Location: Memphis, TN iTrader: (0)	Finally figured out what the issue was. The glovebox light wiring harness had pulled away from the connectors and the bare wires were touching a metal plate, thus grounding the circuit and blowing fuse 77 all the time. To see this, I had to remove the front dash panel around the climate control and just happened to see the bare wires staring at me.
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