Hi all, I really hope someone can help with this one.
My friends B5 Avant had the vacuum pump for the central locking pack in the other day. The usual common fault of the impellor shattering.
The part number for his pump is 8LO862257 'G' but he got hold of a 8LO862257 'A' pump from the scrapyard. I'd done some research for him beforehand and found the 'A' pump would work but he wouldn't have use of the central locking from the remote.
He fitted it and all worked again as expected. The central locking unlocked and locked all doors etc from the door lock but not from the remote.
Last night we took the 'A' pump apart and took the impellor out of it an fitted it in his original pump. All parts inside were identical (apart from the circuit board). We then installed it all back in the car.
The problem now is that the original pump will not lock or unlock the passenger and rear doors, either from the remote or from the door lock. Only the drivers door and fuel flap work.
The pump has 2 outlets that connect to vacuum pipes in the car. We have sussed out one outlet connects to a pipe that controls the drivers door and fuel flap, the other outlet connects to a pipe that controls the other doors.
We noticed when comparing the pumps that the outlet for the other doors is blocked off by what appears to be a solenoid operated valve which is inside the pump box, hence why no air passes down this pipe. Just to check we swapped the pipes over and the passenger and rear door locks all operate fine so it's not a problem with those it's just the pump.
Does anyone know how the electrical side of these pumps work and why the pump is not allowing air to pass through the second outlet?
I have also had it connected to VAG-COM and cleared all the faults from when he was swapping the pumps over and none of them come back again.
I also checked the coding and found it has reset to 13166. As his car has the concert radio I reset the coding to 15208 which is the code required for his car with anti hijack etc on. Changing the coding however has not fixed the problem.
Can anyone help?