E60 Rear Fuse Tap-in Warning
07-04-2009, 08:55 PM
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My Ride: 2005 545, Titanium Gray II, 6 Spd, CWP, Sat, LPP Laser Defense, V1 (hard-wired), iPod, 38% ceramic tint, CDV delete, H&R Street Performance Coil Overs, Forced Air Induction, DriveData Pro Camera System (4 cams), M5 Front Bumper
Just thought I'd pass along a strange tidbit regarding the rear fuse box on my E60. I have a MY2005 545i with virtually every equipment option except the FLIR night vision. So, as you can imagine there are not many empty slots in my fuse panel.
Based on circuit sampling while installing an in-car video system, by chance I discovered that one of the ignition activated circuits in the fuse panel will stay on for one hour after the vehicle is turned off! At first I thought it would cut off after the vehicle went into sleep mode (16 minutes or so), but not this one! It was literally a full hour. I timed it earlier today.
I only discovered this quite by accident. The circuit in question is slot # 87 in the rear fuse block.
So, if you ever want to wire anything directly to the fuse panel, I strongly recommend not using slot # 87 if you want ignition based on/off functionality. In my case, I chose # 81 instead, which appears to function as one would expect (i.e. when I turn the car off, the power is cut to that circuit).
I now suspect this very issue is directly related to some previous battery problems that I had from previous electronic gizmos direct wired from the rear fuse block (i.e. I probably had wired into # 87 and was unknowingly draining the battery every time I started and stopped the vehicle). Presuming that all U.S. E60's are wired the same way, my intent is to warn everyone else who does have or is contemplating any direct wired mods.
Regards,
RR
Based on circuit sampling while installing an in-car video system, by chance I discovered that one of the ignition activated circuits in the fuse panel will stay on for one hour after the vehicle is turned off! At first I thought it would cut off after the vehicle went into sleep mode (16 minutes or so), but not this one! It was literally a full hour. I timed it earlier today.
I only discovered this quite by accident. The circuit in question is slot # 87 in the rear fuse block.
So, if you ever want to wire anything directly to the fuse panel, I strongly recommend not using slot # 87 if you want ignition based on/off functionality. In my case, I chose # 81 instead, which appears to function as one would expect (i.e. when I turn the car off, the power is cut to that circuit).
I now suspect this very issue is directly related to some previous battery problems that I had from previous electronic gizmos direct wired from the rear fuse block (i.e. I probably had wired into # 87 and was unknowingly draining the battery every time I started and stopped the vehicle). Presuming that all U.S. E60's are wired the same way, my intent is to warn everyone else who does have or is contemplating any direct wired mods.
Regards,
RR
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