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Old 03-27-2022, 11:31 PM
Join Date: Apr 2018
Location: Boston, MA
Posts: 2
beachwagon is on a distinguished road
E83 driver's window switch block not working

2007 BMW X3, 190k miles

I have had a long running issue where the driver's switch block stopped working, this included the window switches, mirror motors, auto-fold and auto-dip. The other 3 windows work with their respective switches. This was preceded, 2+ years before, by the driver's folding mirror not working. The switch block's backlight is working but the block is not receiving enough / proper voltage according to INPA - a GM LIN Bus Error is the main code as well as an error with an anti-trap system on all 4 windows.

I have done the following but still haven't fixed the issue:

-Cleared faults with INPA and disconnected the battery
-New driver's mirror thinking that the broken motor may have caused the LIN Bus error
-New OEM Switch Block
-Confirmed that the Driver's window motor is working, window will go down when unlock is held
-Confirmed wire continuity within the door and that there is voltage coming from the chassis to the door but its lower than it needs to be. According to INPA, different then the E46, the driver's block has its own, dedicated power source.
-Replaced fuse A41 per INPA, but no change
-Swapped in an identical GM unit from junkyard and the behavior was the same as with the original

The car's battery is OEM from 2016.

I am ready to do the following but am not sure where to go next: New battery, proactively replace ground straps - but I'm not sure where to look for what is causing my voltage issue.

Any ideas? Anyone else have a similar issue?

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Old 03-28-2022, 06:24 AM
yes_its_neil's Avatar
Join Date: May 2015
Location: Port Lincoln South Australia
Posts: 197
yes_its_neil is on a distinguished road
Replaced fuse A41 per INPA, but no change

Isn't it Fuse 57?

I presume you have had the switch block out? No sign of corrosion?
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2009 X3 3.0D
2005 X5 3.0 Diesel Sport (sold)
2007 320i (sold)
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Old 03-28-2022, 01:35 PM
Join Date: Apr 2018
Location: Boston, MA
Posts: 2
beachwagon is on a distinguished road
I figured it out, the passenger mirror folding mirror must have burned out and caused the LIN Bus issue. Unplugged then disconnected the battery, touched the leads and the issues were all cleared, except for the blown folding motor on the one side.
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Old 04-03-2022, 08:31 AM
getty150's Avatar
Join Date: Jan 2020
Location: GB
Posts: 311
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My experience...

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