Car door lock suddenly noisy

One of the door locks on my Nissan Note has started producing a sort of mechanical whirring sound when I lock it with the key-remote; the actual locking (and unlocking) still works perfectly. Presumably something about the solenoid has changed, but is it likely to be a serious fault which might escalate, or can I safely leave it to be looked at when the car next needs a general service?
Many thanks.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

They are generally motors, not solenoids. With a mechanical gearbox which produces the push pull. One polarity push, reverse it, pull. Controlled by a central timer - the motors merely stall at the end of their travel until the timer cuts the feed. I'd guess a motor rather than solenoid is more efficient and smaller. Maybe even cheaper to make.
They are usually pretty cheap and nasty units with plastic gears which can strip etc. Normally just replaced if faulty.
If the maker's part is stupidly expensive as they often are, it may be possible to fit a generic one.
The system on my old Rover is notoriously unreliable as they get older. My guess being the motors loose power with age. And NOS are no better. I found a similar new generic on Ebay for 12 quid which can be persuaded to fit with minor mods - and it has over 3 times the 'pull' of the standard unit. Works a treat. ;-)
--
*You're just jealous because the voices only talk to me *

Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Dave, many thanks for that. Your post overlapped with my message saying that I've found the solution: apparently, a small pin which is part of the child lock mechanism is known to come slightly adrift: pushing it back into place fixes the problem. Mind you, I haven't actually tried it yet...
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Blimey, would one not have expected it to detect the stall current? Besides there are loads of gadgets, mostly mechanical which can be used to switch things off at end of travel. Sounds like its jolly crude. Brian
--
From the Sofa of Brian Gaff Reply address is active
"Dave Plowman (News)" < snipped-for-privacy@davenoise.co.uk> wrote in message
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

No real need. The locks will operate in say a second. Timer switches off at just over a second. Why make things more complex than needed?
--
*When everything's coming your way, you're in the wrong lane *

Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
I've now discovered that this is a known fault, with a fairly easy if fiddly DIY fix:
http://www.noteownersclub.co.uk/forum/fixnoisy-central-locking_topic2021.html
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.