A bit late for you now, but the PC99-X04 is the wrong adapter lead as the BMW to ISO adapter lead only carries 13 of the 17 cables of the BMW connector, two of the missing ones are for the steering wheel controls.
One option is to replace the PC99-X04 lead with a PC99-X32 lead, which also converts from BMW to ISO.
The other is to fit the two missing cables in the BMW to ISO adapter lead:
From pin 10 of the BMW connector - Blue/Orange cable - to pin 2 of the ISO connector, and from pin 17 of the BMW connector - Blue/Purple cable - to pin 3 of the ISO connector.
Last edited by raykay; 26th May 2013 at 07:34..
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