Good news!!! Fitting a genuine FAG hub appears to have finally fixed my original problem. Just for reference, the hub that I had fitted that did not work had the part number PLB23644 and had a 32mm centre to the bearing.
The following may be of interest to others:
I peeled back the rubber boot on the back of the sensor. Using a pin, I pushed it down the back of the blue wire so that it made contact on the terminal inside the housing. I connected a voltmeter between chassis and the pin. I used the rear door catch striker as a convenient chassis 0V connection. Turning on the ignition the voltage read 11.25V. Rotating the hub slowly the reading alternated between 11.55V and 11.25V.
I experimented with a sensor off the car connected to a 12V supply using a 1000 ohm pull-up resistor (it draws about 6mA). Placing either a magnet or a reluctor ring near the tip of the sensor I measured 5.0V and 3.3V as the polarity of the magnetism changed.
I haven't yet felt the urge to get out my iron filings or my plotting compass to count the number of poles on the original hub and compare it to the pattern part. I suspect that they are different and that the ABS controller eventually decided that one of the back wheels was rotating at a different speed to the other and so it dropped out bringing on the ABS warning light.
It would appear that the control unit tests the buzzer before it operates. If the buzzer measures open circuit then it prevents the system from operating. Why can't it just use the graphic with a warning that the buzzer is inoperative?
Anyway, I removed the lower trim from the passenger side C pillar and the buzzer was easily accessed. I pulled the plug out of the bottom of the sounder and temporarily plugged in a small speaker that I had. I then tested the parking system and it worked correctly!
To remove the old buzzer you have to push out the central part to the plastic rivets from behind and then it all comes off easily. The part number is 8E0 919 279 and they are about £12 on eBay from Europe. I'll check the main dealer locally before ordering online.
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