Rear Glass Break Sensor - Where is it?

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03-20-2015, 01:56 AM

BMWBig6

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Rear Glass Break Sensor - Where is it?

My car is showing a fault code for "rear glass break sensor" but the dealer doesn't know where the physical sensor is located, nor does the parts guy show one for my vehicle (2009 A4 Avant) in their computer.

Does it have another name? Or is the sensor integrated into another component (like a module in the trunk)? Threads for older B6 and B7 cars mention a glass break sensor behind the C-pillar trim but I don't know if B8's are the same and it's not coming up on my online parts searches either.

I did find an "Electrical Connector Housing" (part number 4E0972575) <!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves/> <w:TrackFormatting/> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w

oNotPromoteQF/> <w:LidThemeOther>EN-US</w:LidThemeOther> <w:LidThemeAsian>X-NONE</w:LidThemeAsian> <w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript> <w:Compatibility> <w:BreakWrappedTables/> <w:SnapToGridInCell/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> <w

ontGrowAutofit/> <w:SplitPgBreakAndParaMark/> <w:EnableOpenTypeKerning/> <w

ontFlipMirrorIndents/> <w:OverrideTableStyleHps/> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> <m:mathPr> <m:mathFont m:val="Cambria Math"/> <m:brkBin m:val="before"/> <m:brkBinSub m:val="--"/> <m:smallFrac m:val="off"/> <m:dispDef/> <m:lMargin m:val="0"/> <m:rMargin m:val="0"/> <m:defJc m:val="centerGroup"/> <m:wrapIndent m:val="1440"/> <m:intLim m:val="subSup"/> <m:naryLim m:val="undOvr"/> </m:mathPr></w:WordDocument> </xml><![endif]-->“Used for the glass breakage sensor for hatch window” on ECS Tuning. <!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves/> <w:TrackFormatting/> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w

ontGrowAutofit/> <w:SplitPgBreakAndParaMark/> <w:EnableOpenTypeKerning/> <w

ontFlipMirrorIndents/> <w:OverrideTableStyleHps/> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> <m:mathPr> <m:mathFont m:val="Cambria Math"/> <m:brkBin m:val="before"/> <m:brkBinSub m:val="--"/> <m:smallFrac m:val="off"/> <m:dispDef/> <m:lMargin m:val="0"/> <m:rMargin m:val="0"/> <m:defJc m:val="centerGroup"/> <m:wrapIndent m:val="1440"/> <m:intLim m:val="subSup"/> <m:naryLim m:val="undOvr"/> </m:mathPr></w:WordDocument> </xml><![endif]--> This probably connects to the actual glass break sensor, right?
<!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves/> <w:TrackFormatting/> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w

ontGrowAutofit/> <w:SplitPgBreakAndParaMark/> <w:EnableOpenTypeKerning/> <w

ontFlipMirrorIndents/> <w:OverrideTableStyleHps/> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> <m:mathPr> <m:mathFont m:val="Cambria Math"/> <m:brkBin m:val="before"/> <m:brkBinSub m:val="--"/> <m:smallFrac m:val="off"/> <m:dispDef/> <m:lMargin m:val="0"/> <m:rMargin m:val="0"/> <m:defJc m:val="centerGroup"/> <m:wrapIndent m:val="1440"/> <m:intLim m:val="subSup"/> <m:naryLim m:val="undOvr"/> </m:mathPr></w:WordDocument> </xml><![endif]-->Audi B8 A4 Quattro 2.0T - 4E0972575 - Electrical Connector Housing - 2 Pin - ES#388566

Here's what VCDS shows for the error:

Quote:

-------------------------------------------------------------------------------
Address 46: Central Conv. (J393) Labels: 8K0-907-064-46.clb
Part No SW: 8K0 907 064 AH HW: 8K0 907 064 AH
Component: BCM2 1.1 H80 0143

Subsystem 1 - Part No SW: 8K0 959 719 HW: 8K0 959 719
Component: GTO BF H06 0040

Subsystem 2 - Part No: 1K0 951 605 C
Component: LIN BACKUP HO H03 1301

Subsystem 3 - Part No SW: 8K0 959 591 HW: 8K0 959 591
Component: J245 PS127 H06 0037

Subsystem 4 - Part No SW: 8K0 959 591 HW: 8K0 959 591
Component: J394 PS222 H06 0037

1 Fault Found:
01403 - Glass-Break Sensors; Rear
011 - Open Circuit

Last edited by BMWBig6; 03-20-2015 at 03:33 AM.

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06-15-2015, 01:41 PM

ca3hunns

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my understanding of the way the break sensor works is that there's a thin wire inside the glass, or maybe secured to the edge. when a breakage of the glass breaks that wire, it creates infinite resistance (open loop) and that triggers the break alarm. My alarm goes off if it heats up too fast, probably because the thermal expansion increases the resistance enough. yours might just be broken (= you'll need a new window, I think)