Door lock fault

My daughter has a Ford Fiesta Zetec 1398cc petrol registered in 2008. It is low mileage and has been very well looked-after. The minor problem is that the driver’s door takes three remote blips before it unlocks; the other doors unlock after the first blip. All the doors will unlock immediately if the key is used directly in the driver’s door lock.

I renewed the driver’s door latch assembly, but it didn’t help, so I assume it’s a programming issue. The vehicle’s handbook is unhelpful on this matter, but I’ve read various posts on the internet which recommend unlocking the driver’s door then simultaneously holding down the lock and unlock buttons on the remote, but this didn’t work.

I have access to a Ford VCM II diagnostic interface and this doesn’t appear to highlight a fault, although it did show ‘DTC B1175’ and ‘Failure type 92 (protocol 14229)’, but I think this was because the driver’s door was open while the test was being run. Bruce When you replaced the latch assembly, did this include the solenoid/motor and locking cable? Yes, I replaced the whole assembly. Bruce It has to be a wiring problem. As all four other doors get triggered off the same circuit, the fault must be in the wiring between the latch assembly and the wiring loom under the dash – probably in the section running from the door to the inner wing, where constant movement over the years can cause wires to part company. You could confirm this by installing temporary wiring that bypasses that point or by taking a bypass feed from another door.