Mazda Repair Questions? Ask Mechanics for Answers ASAP
I am sorry that you have not been helped yet. I just came on line and saw your question.
Was the u1900 present before your replaced the seat carrier and did you use a new or salvage yard part?
I need the last 8 digits of the vin number to pull the correct schematics.
The U1900 because it does involve the SAS control module can prevent the seat calibration from running and completing. The only correlation between the U1900 and the seat carrier would be if either you shorted a wire during installation. Other than that, I just dont see a correlation and suspect the U1900 was there to before replacement.
I suspect the SAS control module is faulty, but I have uploaded the testing procedure for you
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I am not sure what else it could be. I will opt out and see if another expert has an idea on this one