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Old 03-12-2014, 12:05 PM
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JCL JCL is offline
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Join Date: Mar 2005
Location: Vancouver, Canada
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JCL will become famous soon enoughJCL will become famous soon enough
The problem was the rain sensor, and the two windshields that didn't work were inspected by the glass shop. They brought in senior techs from another location. They said there was nothing apparently wrong with the glass or sensor, but agreed it didn't work. They said they had used that aftermarket glass with installed sensor many times and were confident in it. For the third windshield, they went OEM. Worked perfectly. They suspect a bad batch of windshields from the aftermarket supplier.

You are incorrect that parts made by an OEM are necessarily the same for what they supply to a manufacturer to be sold as OE. They may be, but they are not necessarily the same. I worked for a Tier 1 supplier to the automotive industry, and in a separate distributor that sold OE parts. Lots of differences are possible, including quality, testing, and subcomponents used. Sometimes a subcomponent is proprietary, so they put a substitute in that may or may not work the same. Things that relate to the PPAP certification can also cause changes when a non PPAP part is sold directly. Saying that the component is identical except it has a roundel is like saying that another brand of car becomes a BMW if you put a roundel on the trunk.
2007 X3 3.0si, 6 MT, Premium, White

2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver

2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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