Noise when unlocking Z4

[Andrew715]

Hello, I recently bought a Z4 2005 3.0.

When you unlock the car there is a long whine or hydraulic kind of noise (about 5 seconds) . Also when it drives along, the same sound occurs occasionally. Is this normal? I have seen videos which suggest it is not. If it isn't, what can I do about it?

Thanks

[markeg]

For the first one, if you have memory seats, could it be your electric seat adjusting to the programmed setting (as logged in the key)?

[Andrew715]

Hello, no it's not the electic seats. It is an external sound.

[andrewr]

Could it be the actuator inside the petrol cap? Have a listen near there.

If not, any ideas to which part of the car the sound may be coming from?

Andrew.

[PerryGunn]

Hello, no it's not the electic seats. It is an external sound.

- Wing mirrors adjusting (unlikely if it does it while you're driving along)
- Fuel pump priming
- If it's got the SMG 'box, it might be the SMG pump pressurising the transmission

[Andrew715]

Thanks, it is the SMG hydraulic pump pressurising the system- found it on another forum after you mentioned it!

[andysat]

Thanks, it is the SMG hydraulic pump pressurising the system- found it on another forum after you mentioned it!

Another forum??