Join Date: Nov 2010
Location: United Kingdom
Central locking failure - single door whirring noise
If you have a whirring noise from your door lock and it does not lock read on this might help --
Biggest job so far (by me!) on the alfa (2007 159 2.4 JTDm). Wednesday night the passenger door central locking failed. Nothing but a short burst of whirring sound and the door remaining unlocked when the lock button on the key fob activated. Soon confirmed it was a single door problem – rest of the system OK. The whirring sounded pretty ominous, but at least mechanical rather than electrical failure, therefore some hope of a fix, Eventually found that the little switch that the metal key fits in the door panel by the latch activates the external lock – or more correctly – disables the external handle from opening the door. So at least I could lock the car and still open it from the inside as the interior handle brings the external handle back into operation.
So the strip down to get to the lock mechanism (luckily with the benefit of elearn):
3 cross head screws at bottom of interior panel.
Remove and disconnect puddle light – clip at rear of fixture.
1 allen bolt behind interior handle.
1 allen bolt to take grab handle off where window switch is, disconnect window switch.
2 allen bolts under grab handle moulding.
Removed small front corner trim above panel, it has a small central clip then can be removed by bending towards the interior.
Plastic blade between trim panel and door to release all the fir tree clips starting at the bottom then levering off the glass window wiper trim. Bit of fiddle but panel should come off OK remaining connected by the inner handle cable. Push the handle fitting rearwards and it will slip off the inside of the panel. Panel removed leaving an inner aluminium looking panel which actuall holds all the fittings for the window and door lock.
Removed speaker to gain some access. Removed 2 round bungs then reconnected window switch to lower window so bolts holding glass can be loosed – but not removed- releasing grip on rubber padded clamps. Lower window further but not all way to bottom, remove widow glass wiper trim by gently pulling up off door frame.
The hairy bit – lift the glass up out of the window winder mechanism– taking it up and tilting forward to remove from rear channel. It goes up and out through the outside of the car.
Disconnect retainer holding exterior mirror wiring and also the plug into the switch box. Disconnect another wire going up into the window frame.
Undo 3 door lock torx bolts.
Undo all 10mm bolts around inner panel – panel will now be loose but will not come away until :
Disconnect the main body/door loom connector and push rubber bung into door along with connector and the bit they don’t tell you – push the main loom bung through the inner panel to prevent the shape of the sealing bung fouling on the door frame and holding the inner panel in place. Inner panel must be removed at the front first to allow it to swing away so you can disconnect the exterior door handle cable from the locking mechanism. Releasing the inner panel is a pig because the window runner channel foul on the door aperture at the front lower and top too but with a bit of jiggling, lifting and rotating it will come away.
Disconnect electrical connection to lock mechanism then remove lock from bracket on inner panel. Remove inner door handle cable from lock (its under a white plastic hinged cover) and it is the usual bent rod. 2 small Phillips screws hold the plastic cover on lock mechanism. This plastic cover also holds motors for activating the locking and deadlocking function. Press 2 plastic clips and the plastic and metal can be parted to reveal all the interior locking mechanism.
And the problem was: a tiny brass cog had become loose on the motor spindle so was not being driven securely. Pulled the cog off, roughed up the spindle, tapped the cog back on and made sure it was really tight. Topped off with some superglue down the inner drilled hole through the cog.
And fitting is all the reverse of the above with care to make sure loom wire sits around front window runner not across it, speaker aperture helps in feeding loom back up to hole in frame. Take care putting glass back in, bit of a fiddle but should not need force!
So if you get a short burst of a whirring noise from the door when central locking and door remains locked/unlocked you may well have this problem. Hope I've remembered all the details - - - Good luck.