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      09-02-2009, 05:39 PM   #241
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Drives: 2012 E92 M3, 2014 528i
Join Date: Apr 2005
Location: Ft Lauderdale, Florida

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For the TCU type, just take a look at the label printed on top of it. Somewhere it should say "GSM"; if there is no GSM anywhere then it is a CDMA.

I think that the M3 code is different from the regular 3 Series code from the point of view of the iDrive/Assist relationship, because so far nobody with a pre-03/08 M3 has been able to retrofit this knob and got it working -at least in this forum.

My theory was that at 04/08 the TCU changed from CDMA to GSM and that was the only major hardware and software mid-production change in the M3 in 2008. But now your are saying that the new controller works fully in your 03/08 M3, my theory is out the window unless your M3 has a GSM TCU (a very late 03/08/almost 04/08 production)...
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