[Just2fast5]

Hi all 

I was wondering if someone could help me here please. 

I have retrofitted neck warmers in my F33 but I cannot figure out this issue, its looking like the heater element is faulty but I just want to be 100% before I buy any more parts. 

I've checked all the wiring and it's fine I've checked the ISTA wiring diagram and it's 100% like for like I just can't see both heating elements being gone although I have brought the seats second hand with no back ground on them. 

The seats are from a M4 with the control modules they come with being used after I coded them to my car to remove all errors. I just don't know if there are any more cables the M4 seat might require that would not show up on the neck warmer diagram? Maybe a extra ground wire? 

I can get the fans to kick in with the ISTA test plan but cannot get them to heat up any help with where to look would be appreciated. 

Thanks 
Daniel