W140 - Lumbar / Seat Adjustments
Both driver and passenger seat lumbar adjustments on my 94 S350 do not work. Not sure if the vacuum supply pump is bad or is it not working because of some other cause. How can I test the system to find the cause of the malfunction?
Any help would be appreciated.
Sail42
94 S350
92 300SD / 500SD
87 E300D
85 300D
79 450SEL
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