S8 Quattro Sedan V8-4.2L (AYS) (2002)
Vacuum/Pressure Pump Switch: Service and Repair
Pump, Pressure Switch And Valve Block For Lumbar Adjustment, Removing And Installing
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Seat removed
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Seatback cover and seatback cushion
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Cut open tie wrap to protective sack, release sack from seatback frame (double sided ban) and remove.
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Remove valve block for lumbar adjustment - 3 - from seatback frame.
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Loosen air pillow - 1 - and - 2 - carefully from styro plate (double adhesive).
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Disconnect connectors to pump for lumbar adjustment - 5 -, to pressure switch for lumbar adjustment - 4 - and to valve block - 3 - for lumbar
adjustment.
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Remove affected hoses.