S202 Central Locking and seat pump advice required please.

[Blobsta]

My C43 has an annoying thing where you can hear the vacuum/pressure pump running in the boot. I definitely have an air leak somewhere as when you start the car you can feel it pump the lumbar supports up in the seats. Pretty much all seems fine in the operation of it but of course the pump is probably running way too much and as such, it will fail at some point.

I noticed that it has written on it "Original pump, MIL 8013" This was an old registration on the car so it's been investigated before at some time.

Here is a clip to better illustrate what is happening but to me it is as though it builds pressure then immediately decides it needs to do it again.

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I've been round all of the joins that I can easily get to with soapy solution to see if I can find air escaping and I can't. It makes no difference if there are people in the seats either as I thought that would have had an effect on the pressure. My suspicion is that the pump (or a sensor in it) is faulty, perhaps the valve block itself has failed inside... Anyone have any experience of these or this issue? Perhaps recommend a specialist to bench test ti for me? As I have said, everything in the car appears to operate as expected.

Thanks as always

 

[grober]

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