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E46 Convertible
The E46 vert forum. Talk about dropping your E46 top here.

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Old 05-24-2017, 04:37 PM   #41
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Join Date: Apr 2016
Location: London, UK
Posts: 49
My Ride: 323ci convertible
Ok, found some info in the convertible top manual pdf.

Hard Top Lock Hall Sensor (S164 Switch, Hard Top Recognition)
The hard top recognition hall sensor is positioned on the left hard top lock. It receives power and ground from the CVM and provides a high signal input when the hard top is installed on the vehicle. The connector on the top of the lock is used as the power and ground supply for the rear window defroster of the hard top. The CVM uses the input signal of the hall sensor to lock out soft top operation while the hard top is installed.

I'll investigate further on my vehicle...
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Old 05-24-2017, 05:03 PM   #42
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Join Date: Apr 2017
Location: England
Posts: 50
My Ride: BMW E46 Convertible
the best thing to get is the complete software package online. For 35 quid i got every piece of diagnostic software I could need and the cable. It will tell you exactly what sensor is playing up.
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Old 05-24-2017, 06:06 PM   #43
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Join Date: Apr 2016
Location: London, UK
Posts: 49
My Ride: 323ci convertible
So, the fault code I was getting with my crappy reader was this:
2A Switch,convertible-top locked, voltage undefined
Which sounds like it might be the hard top lock hall sensor.

You got a link to the software package you bought online?
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