please post an image of the unit or its full BMW part number if available.
61.35-9147221-01 - I have since phoned BMW direct and they say it is a CAS unit.. Which if burnt out means a replacement unit and re-programOr purchase a second hand ECU, EWS, & CAS unit with ignition and key, they get it programmed.My concern is that the burnt out CAS is the result not the cause and it will happen again, and its a costly test to replace and try again. I cant see any obvious shorts on the loom, and the only thing that has changed electronically is a remap from a local firm taking the output upto 228hp
that is indeed a CAS, and the fix is indeed replacement and reprogram.
if there are no wiring shorts there is nothing common to point to as a possible outside cause. CAS units are known to fail from time to time.
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sorry one further thing, before I rate youIn your opinion would it be possible to blow the unit from changing the mapping alone?The mechanic at BMW thought it might be possible to cause the alternator to over produce feeding back into the unit and cooking it?
Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you.
a mapping should not cause the alternator to over produce.
if the alternator was over producing I would expect a) this could be easily tested for and b) that other units, not just the CAS, would have issues.
this is very unlikely in my opinion